Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS (Details)

v3.8.0.1
FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets and liabilities measured at fair value on a recurring basis      
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net $ 150 $ 0  
Trading securities 407 384  
Available-for-sale securities 7,807 6,413  
Derivative, Collateral, Obligation to Return Cash 55 201  
Derivative, Collateral, Right to Reclaim Cash 2 17  
Level 1      
Assets and liabilities measured at fair value on a recurring basis      
Trading securities 212 202  
Available-for-sale securities 1,899 1,655  
Derivatives 7 4  
Total assets 2,118 1,861  
Derivatives (3) 11  
Total liabilities (3) 11  
Level 2      
Assets and liabilities measured at fair value on a recurring basis      
Trading securities 127 115  
Available-for-sale securities 5,739 4,619  
Derivatives 250 878  
Total assets 6,116 5,612  
Derivatives (262) 276  
Total liabilities (262) 276  
Level 3      
Assets and liabilities measured at fair value on a recurring basis      
Trading securities 3 4  
Available-for-sale securities 169 139  
Derivatives 0 0  
Total assets 172 143  
Derivatives 0 0  
Total liabilities 0 0  
Other [Member]      
Assets and liabilities measured at fair value on a recurring basis      
Trading securities 65 63  
Available-for-sale securities 0 0  
Derivatives 0 0  
Total assets 65 63  
Derivatives 0 0  
Total liabilities 0 0  
Netting Adjustment      
Assets and liabilities measured at fair value on a recurring basis      
Trading securities 0 0  
Available-for-sale securities 0 0  
Derivatives (198) (369)  
Total assets (198) (369)  
Derivatives 147 (192)  
Total liabilities 147 (192)  
Fair Value Measurements      
Assets and liabilities measured at fair value on a recurring basis      
Trading securities 407 384  
Available-for-sale securities 7,807 6,413  
Derivatives 59 513  
Total assets 8,273 7,310  
Derivatives (118) 95  
Total liabilities (118) 95  
Prepaid Expenses and Other Current Assets      
Assets and liabilities measured at fair value on a recurring basis      
Derivatives   347  
Other assets      
Assets and liabilities measured at fair value on a recurring basis      
Trading securities 112 102  
Derivatives 59 166  
Accounts Payable and Accrued Liabilities      
Assets and liabilities measured at fair value on a recurring basis      
Derivatives 28 42  
Liabilities held for sale - discontinued operations [Member]      
Assets and liabilities measured at fair value on a recurring basis      
Derivatives 12    
Other liabilities      
Assets and liabilities measured at fair value on a recurring basis      
Derivatives 78 53  
Pension benefits      
Assets and liabilities measured at fair value on a recurring basis      
Defined Benefit Plan, Fair Value of Plan Assets 8,843 8,371 $ 7,689
Pension benefits | Cash and cash equivalents      
Assets and liabilities measured at fair value on a recurring basis      
Defined Benefit Plan, Fair Value of Plan Assets $ 691 $ 402