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Derivative Instruments and Hedging Activities (Assets and Liabilities - Current vs. Noncurrent Derivative instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | $ 84 | $ 99
Derivative Liability, Current |  | 211 | 155
Derivative Asset, Noncurrent |  | 264 | 277
Derivative Liability, Noncurrent |  | 104 | 269
Total asset derivatives |  | 348 | 376
Total liability derivatives |  | 315 | 424
Contracts Subject To Netting Arrangements |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Total liability derivatives | [1] | 15 | 41
Collateral Already Posted, Aggregate Fair Value | [1] | $ 9 | $ 18
[1] | Based on the credit rating of certain subsidiaries

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