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Financial and Derivative Instruments Financial and Derivative Instruments - Effect of Derivatives Not Designated On Hedging Instruments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative instruments not designated as hedging instruments, gain (loss), net | $ 105 | $ (116) | $ (300)
Commodity | Sales and other operating revenues |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative instruments not designated as hedging instruments, gain (loss), net | 135 | (105) | (269)
Commodity | Purchased crude oil and products |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative instruments not designated as hedging instruments, gain (loss), net | (33) | (9) | (31)
Commodity | Other income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative instruments not designated as hedging instruments, gain (loss), net | $ 3 | $ (2) | $ 0

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: 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=109980867&loc=SL5624171-113959 + Details
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