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Derivative and Financial Instruments - Commodity Balance Sheet (Details) - Commodity Contract [Member] - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative assets | $ 288 | $ 410
Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative assets | 34 | 40
Other accruals [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative liabilities | 283 | 370
Other liabilities and deferred credits [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative liabilities | $ 28 | $ 30

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