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Price Risk Management Activities, Gain (Loss) by Income Statement Location (Details) - Cost of Materials and Other [Member] - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Economic Hedges [Member] | Commodity Contracts [Member] |  |
Effect of Derivative Instruments on Income |  |
Gain (loss) recognized in income on derivatives | $ (48) | $ (97)
Economic Hedges [Member] | Foreign Currency Contracts [Member] |  |
Effect of Derivative Instruments on Income |  |
Gain (loss) recognized in income on derivatives | (3) | (6)
Trading Derivatives [Member] | Commodity Contracts [Member] |  |
Effect of Derivative Instruments on Income |  |
Gain (loss) recognized in income on derivatives | $ 36 | $ 1

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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