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Derivative and Financial Instruments - Commodity Gain (Loss) (Details) - Commodity Contract [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Sales and other operating revenues [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) from commodity derivatives | $ 33 | $ 4 | $ 30 | $ 68
Other Income [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) from commodity derivatives | (2) | 3 | 3 | 4
Purchased commodities [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) from commodity derivatives | $ (27) | $ (9) | $ (29) | $ (60)

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