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Hedging Activities (Effect on Consolidated Financial Statements) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Gain (loss) recognized in income | $ 240 | $ 19 | $ 85 | $ (212)
Foreign Exchange Contracts, Balance Sheet [Member] | Foreign Currency Transaction and Hedge Gain (Loss), Net [Member] |  |  |  |
Gain (loss) recognized in income | 10 | (7) | 19 | (19)
Translated Earnings Contracts [Member] | Foreign Currency Transaction and Hedge Gain (Loss), Net [Member] |  |  |  |
Gain (loss) recognized in income | $ 230 | $ 26 | $ 66 | $ (193)

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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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