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Price Risk Management Activities, Effect of Derivative Instruments on Income and Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Commodity Contracts [Member] |  |  |  |
Effect of Derivative Instruments on Income |  |  |  |
Gain recognized in other comprehensive income (loss) on derivatives | $ 2 | $ 3 | $ 52 | $ 7
Commodity Contracts [Member] | Revenues [Member] |  |  |  |
Effect of Derivative Instruments on Income |  |  |  |
Gain (loss) reclassified from accumulated other comprehensive income (loss) into income | (3) | 8 | 42 | 6
Commodity Contracts [Member] | Revenues [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Effect of Derivative Instruments on Income |  |  |  |
Gain (loss) recognized in income on derivatives | (4) | (1) | (3) | 4
Commodity Contracts [Member] | Cost of Materials and Other [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Effect of Derivative Instruments on Income |  |  |  |
Gain (loss) recognized in income on derivatives | 118 | (26) | 106 | (25)
Commodity Contracts [Member] | Operating Expenses (Excluding Depreciation and Amortization Expense) [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Effect of Derivative Instruments on Income |  |  |  |
Gain (loss) recognized in income on derivatives | 0 | 0 | 2 | 0
Foreign Currency Contracts [Member] | Cost of Materials and Other [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Effect of Derivative Instruments on Income |  |  |  |
Gain (loss) recognized in income on derivatives | (6) | 9 | 43 | 2
Foreign Currency Contracts [Member] | Other Income, Net [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Effect of Derivative Instruments on Income |  |  |  |
Gain (loss) recognized in income on derivatives | $ 56 | $ (19) | $ (49) | $ 36

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- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121577181&loc=SL110061190-113977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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