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Price Risk Management Activities, Effect of Derivative Instruments on Income (Details) - Derivatives Not Designated as Hedging Instruments [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Commodity Contracts [Member] | Revenues [Member] |  |  |  |
Effect of Derivative Instruments on Income |  |  |  |
Gain (loss) recognized in income on derivatives | $ (1) | $ 0 | $ 4 | $ 0
Commodity Contracts [Member] | Cost of Materials and Other [Member] |  |  |  |
Effect of Derivative Instruments on Income |  |  |  |
Gain (loss) recognized in income on derivatives | (26) | (98) | (25) | (125)
Foreign Currency Contracts [Member] | Cost of Materials and Other [Member] |  |  |  |
Effect of Derivative Instruments on Income |  |  |  |
Gain (loss) recognized in income on derivatives | 9 | (7) | 2 | 7
Foreign Currency Contracts [Member] | Other Income, Net [Member] |  |  |  |
Effect of Derivative Instruments on Income |  |  |  |
Gain (loss) recognized in income on derivatives | $ (19) | $ 11 | $ 36 | $ (6)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- References No definition available. + Details
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