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Price Risk Management Activities, Gain (Loss) by Income Statement Location (Details) - Cost of Sales [Member] - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Economic Hedging [Member] | Commodity Contracts [Member] |  |
Effect of Derivative Instruments on Income and OCI |  |
Gain (loss) recognized in income on derivatives | $ (139) | $ 64
Economic Hedging [Member] | Foreign Currency Contracts [Member] |  |
Effect of Derivative Instruments on Income and OCI |  |
Gain (loss) recognized in income on derivatives | (3) | 22
Trading Derivatives [Member] | Commodity Contracts [Member] |  |
Effect of Derivative Instruments on Income and OCI |  |
Gain (loss) recognized in income on derivatives | $ 41 | $ 20

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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=56946850&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=56946850&loc=SL5624171-113959 + Details
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