Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS (Details 3)

v3.20.4
FAIR VALUE MEASUREMENTS (Details 3) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plans, Defined Benefit [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 8,639 $ 8,080 $ 7,429
Pension Plans, Defined Benefit [Member] | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 678 741  
Pension Plans, Defined Benefit [Member] | Government bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 637 536  
Pension Plans, Defined Benefit [Member] | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,042 964  
Pension Plans, Defined Benefit [Member] | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 814 898  
Pension Plans, Defined Benefit [Member] | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 622 689  
Pension Plans, Defined Benefit [Member] | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 332 342  
Pension Plans, Defined Benefit [Member] | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 664 619  
Pension Plans, Defined Benefit [Member] | Defined Benefit Plan, Derivative      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (15) 0  
Pension Plans, Defined Benefit [Member] | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,139 1,904  
Pension Plans, Defined Benefit [Member] | Equity Securities, International based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,726 1,387  
Other Postretirement Benefits Plan [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 396 339 289
Other Postretirement Benefits Plan [Member] | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 30 57  
Other Postretirement Benefits Plan [Member] | Government bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 3 3  
Other Postretirement Benefits Plan [Member] | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 80 47  
Other Postretirement Benefits Plan [Member] | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 86 84  
Other Postretirement Benefits Plan [Member] | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 7 7  
Other Postretirement Benefits Plan [Member] | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 4 4  
Other Postretirement Benefits Plan [Member] | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 4 4  
Other Postretirement Benefits Plan [Member] | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 170 124  
Other Postretirement Benefits Plan [Member] | Equity Securities, International based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 12 9  
Level 1 | Pension Plans, Defined Benefit [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 4,419 3,867  
Level 1 | Pension Plans, Defined Benefit [Member] | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 558 597  
Level 1 | Pension Plans, Defined Benefit [Member] | Government bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Pension Plans, Defined Benefit [Member] | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Pension Plans, Defined Benefit [Member] | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 44 40  
Level 1 | Pension Plans, Defined Benefit [Member] | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Pension Plans, Defined Benefit [Member] | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Pension Plans, Defined Benefit [Member] | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Pension Plans, Defined Benefit [Member] | Defined Benefit Plan, Derivative      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Pension Plans, Defined Benefit [Member] | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,123 1,876  
Level 1 | Pension Plans, Defined Benefit [Member] | Equity Securities, International based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,694 1,354  
Level 1 | Other Postretirement Benefits Plan [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 210 189  
Level 1 | Other Postretirement Benefits Plan [Member] | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 29 56  
Level 1 | Other Postretirement Benefits Plan [Member] | Government bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Other Postretirement Benefits Plan [Member] | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Other Postretirement Benefits Plan [Member] | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Other Postretirement Benefits Plan [Member] | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Other Postretirement Benefits Plan [Member] | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Other Postretirement Benefits Plan [Member] | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Other Postretirement Benefits Plan [Member] | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 169 124  
Level 1 | Other Postretirement Benefits Plan [Member] | Equity Securities, International based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 12 9  
Level 2 | Pension Plans, Defined Benefit [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,065 1,902  
Level 2 | Pension Plans, Defined Benefit [Member] | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 120 144  
Level 2 | Pension Plans, Defined Benefit [Member] | Government bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 637 536  
Level 2 | Pension Plans, Defined Benefit [Member] | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,011 924  
Level 2 | Pension Plans, Defined Benefit [Member] | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 268 258  
Level 2 | Pension Plans, Defined Benefit [Member] | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 2 | Pension Plans, Defined Benefit [Member] | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 2 | Pension Plans, Defined Benefit [Member] | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 2 | Pension Plans, Defined Benefit [Member] | Defined Benefit Plan, Derivative      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (15) 0  
Level 2 | Pension Plans, Defined Benefit [Member] | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 12 7  
Level 2 | Pension Plans, Defined Benefit [Member] | Equity Securities, International based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 32 33  
Level 2 | Other Postretirement Benefits Plan [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 169 53  
Level 2 | Other Postretirement Benefits Plan [Member] | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1 1  
Level 2 | Other Postretirement Benefits Plan [Member] | Government bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 3 3  
Level 2 | Other Postretirement Benefits Plan [Member] | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 80 47  
Level 2 | Other Postretirement Benefits Plan [Member] | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 84 2  
Level 2 | Other Postretirement Benefits Plan [Member] | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 2 | Other Postretirement Benefits Plan [Member] | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 2 | Other Postretirement Benefits Plan [Member] | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 2 | Other Postretirement Benefits Plan [Member] | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1 0  
Level 2 | Other Postretirement Benefits Plan [Member] | Equity Securities, International based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | Pension Plans, Defined Benefit [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 337 334 303
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held 7 11  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement (31) 23  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 8 5  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Net Foreign Currency Translation Adjustments 19 (8)  
Level 3 | Pension Plans, Defined Benefit [Member] | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | Pension Plans, Defined Benefit [Member] | Equity securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 4 21 17
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held 0 1  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement (18) 1  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 1 2  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Net Foreign Currency Translation Adjustments 0 0  
Level 3 | Pension Plans, Defined Benefit [Member] | Government bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | Pension Plans, Defined Benefit [Member] | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 31 40  
Level 3 | Pension Plans, Defined Benefit [Member] | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | Pension Plans, Defined Benefit [Member] | Fixed Income Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 31 40 16
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held 1 0  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement (17) 21  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 7 3  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Net Foreign Currency Translation Adjustments 0 0  
Level 3 | Pension Plans, Defined Benefit [Member] | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | Pension Plans, Defined Benefit [Member] | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | Pension Plans, Defined Benefit [Member] | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 302 273 $ 270
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held 6 10  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement 4 1  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 0 0  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Net Foreign Currency Translation Adjustments 19 (8)  
Level 3 | Pension Plans, Defined Benefit [Member] | Defined Benefit Plan, Derivative      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | Pension Plans, Defined Benefit [Member] | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 4 21  
Level 3 | Pension Plans, Defined Benefit [Member] | Equity Securities, International based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,818 1,977  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit [Member] | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit [Member] | Government bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit [Member] | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit [Member] | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 502 600  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit [Member] | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 622 689  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit [Member] | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 332 342  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit [Member] | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 362 346  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit [Member] | Defined Benefit Plan, Derivative      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit [Member] | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit [Member] | Equity Securities, International based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 17 97  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan [Member] | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan [Member] | Government bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan [Member] | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan [Member] | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2 82  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan [Member] | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 7 7  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan [Member] | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 4 4  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan [Member] | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 4 4  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan [Member] | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan [Member] | Equity Securities, International based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 0 $ 0