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Derivative Instruments and Hedging Activities (Assets and Liabilities - Current vs. Noncurrent Derivative instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | $ 99 | $ 86
Derivative Liability, Current |  | 155 | 144
Derivative Asset, Noncurrent |  | 277 | 289
Derivative Liability, Noncurrent |  | 269 | 346
Total asset derivatives |  | 376 | 375
Total liability derivatives |  | 424 | 490
Contracts Subject To Netting Arrangements |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total asset derivatives | [1] | 41 |
Total liability derivatives | [1] |  | 58
Derivative Assets Not Offset Under Netting Arrangements | [1] | $ 18 |
Derivative Liabilities Not Offset Under Netting Arrangements | [1] |  | $ 38
[1] | Based on the credit rating of certain subsidiaries

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