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Financial and Derivative Instruments - Effect of Derivatives Not Designated as Hedging Instruments (Details) - Commodity - 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
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 37 | $ 48 | $ 255 | $ (208)
Sales and other operating revenues |  |  |  |
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 38 | 55 | 283 | (189)
Purchased crude oil and products |  |  |  |
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (7) | (7) | (31) | (16)
Other income |  |  |  |
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 6 | $ 0 | $ 3 | $ (3)

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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=121590274&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=121590274&loc=SL5624171-113959 + Details
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