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Derivative and Financial Instruments - Commodity GainLoss (Details) - Commodity Contract [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Sales and other operating revenues [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) from commodity derivatives | $ 141,000,000 | $ 45,000,000 | $ 77,000,000
Other Income [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) from commodity derivatives | 4,000,000 | 7,000,000 | 0
Purchased commodities [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) from commodity derivatives | $ (118,000,000) | $ (41,000,000) | $ (61,000,000)

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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of price risk derivatives not designated as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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