Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS (Details 3)

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FAIR VALUE MEASUREMENTS (Details 3) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 8,905 $ 8,639 $ 8,080
Pension Plans, Defined Benefit | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 505 678  
Pension Plans, Defined Benefit | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,431 2,139  
Pension Plans, Defined Benefit | Equity Securities, International based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,706 1,726  
Pension Plans, Defined Benefit | Government bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 677 637  
Pension Plans, Defined Benefit | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,023 1,042  
Pension Plans, Defined Benefit | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 850 814  
Pension Plans, Defined Benefit | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 720 622  
Pension Plans, Defined Benefit | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 389 332  
Pension Plans, Defined Benefit | Defined Benefit Plan, Derivative      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (9) (15)  
Pension Plans, Defined Benefit | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 613 664  
Other Postretirement Benefits Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 419 396 339
Other Postretirement Benefits Plan | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 33 30  
Other Postretirement Benefits Plan | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 184 170  
Other Postretirement Benefits Plan | 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 12  
Other Postretirement Benefits Plan | 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 | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 82 80  
Other Postretirement Benefits Plan | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 87 86  
Other Postretirement Benefits Plan | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 9 7  
Other Postretirement Benefits Plan | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 5 4  
Other Postretirement Benefits Plan | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 4 4  
Level 1 | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 4,581 4,419  
Level 1 | Pension Plans, Defined Benefit | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 479 558  
Level 1 | Pension Plans, Defined Benefit | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,382 2,123  
Level 1 | Pension Plans, Defined Benefit | Equity Securities, International based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,684 1,694  
Level 1 | Pension Plans, Defined Benefit | 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 | 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 | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 36 44  
Level 1 | Pension Plans, Defined Benefit | 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 | 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 | 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 | 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      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 227 210  
Level 1 | Other Postretirement Benefits Plan | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 32 29  
Level 1 | Other Postretirement Benefits Plan | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 183 169  
Level 1 | Other Postretirement Benefits Plan | 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 12  
Level 1 | Other Postretirement Benefits Plan | 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 | 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 | 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 | 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 | 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 | 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      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,015 2,065  
Level 2 | Pension Plans, Defined Benefit | Cash and cash equivalents      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 26 120  
Level 2 | Pension Plans, Defined Benefit | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 22 12  
Level 2 | Pension Plans, Defined Benefit | Equity Securities, International based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 22 32  
Level 2 | Pension Plans, Defined Benefit | Government bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 677 637  
Level 2 | Pension Plans, Defined Benefit | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 994 1,011  
Level 2 | Pension Plans, Defined Benefit | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 283 268  
Level 2 | Pension Plans, Defined Benefit | 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 | 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 | Defined Benefit Plan, Derivative      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (9) (15)  
Level 2 | Pension Plans, Defined Benefit | 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      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 172 169  
Level 2 | Other Postretirement Benefits Plan | 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 | 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 1  
Level 2 | Other Postretirement Benefits Plan | 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 2 | Other Postretirement Benefits Plan | 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 | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 82 80  
Level 2 | Other Postretirement Benefits Plan | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 85 84  
Level 2 | Other Postretirement Benefits Plan | 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 | 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 | Other      
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      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 339 337 334
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held 12 7  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement 7 (31)  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 (6) 8  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Net Foreign Currency Translation Adjustments (11) 19  
Level 3 | Pension Plans, Defined Benefit | 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 | Equity securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 27 4 21
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held 21 0  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement 2 (18)  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 0 1  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Net Foreign Currency Translation Adjustments 0 0  
Level 3 | Pension Plans, Defined Benefit | Equity Securities, US based companies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 27 4  
Level 3 | Pension Plans, Defined Benefit | 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 | 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 | Corporate bonds and debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 29 31  
Level 3 | Pension Plans, Defined Benefit | 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 | Fixed Income Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 29 31 40
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held (3) 1  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement 7 (17)  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 (6) 7  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Net Foreign Currency Translation Adjustments 0 0  
Level 3 | Pension Plans, Defined Benefit | 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 | 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 | 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 | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 283 302 $ 273
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held (6) 6  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement (2) 4  
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 (11) 19  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,970 1,818  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit | 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 | 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 | 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 | 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 | 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 | Mutual, pooled and commingled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 531 502  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 720 622  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 389 332  
Fair Value Measured at Net Asset Value Per Share | Pension Plans, Defined Benefit | 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 | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 330 362  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 20 17  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan | 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 | 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 | 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 | 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 | 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 | 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 2  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan | Hedge funds/limited partnerships      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 9 7  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan | Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 5 4  
Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits Plan | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 4 $ 4