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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
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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

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