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Derivative Instruments and Hedging Activities (Assets and Liabilities - Current vs. Noncurrent Derivative instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative Asset, Current $ 86 $ 77
Derivative Liability, Current 144 148
Derivative Asset, Noncurrent 289 203
Derivative Liability, Noncurrent 346 366
Total asset derivatives 375 280
Total liability derivatives 490 514
Asset, Formerly Accounted for as a Derivative, to be Amortized into Earnings 147 161
Liability, Formerly Accounted for as a Derivative, to be Amortized into Earnings 166 180
Contracts Subject To Netting Arrangements    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 57 53
Total liability derivatives 467 507
Derivative Assets Not Offset Under Netting Arrangements (18) (10)
Derivative Liabilities Not Offset Under Netting Arrangements (18) (10)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 0 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral (38) (26)
Derivative Asset 39 43
Derivative Liability $ 411 $ 471