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Derivative and Financial Instruments - Commodity Balance Sheet (Details) - Commodity Contract [Member] - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative assets | $ 259 | $ 275
Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative assets | 42 | 36
Other accruals [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative liabilities | 278 | 282
Other liabilities and deferred credits [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative liabilities | $ 37 | $ 28

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