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Hedging Activities (Effect on Consolidated Financial Statements) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Gain (loss) recognized in income | $ (93) | $ (121) | $ (448)
Not Designated as Hedging Instrument [Member] |  |  |
Gain (loss) recognized in income | (71) | (137) | (475)
Foreign Exchange Contracts, Balance Sheet [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Gain (loss) recognized in income | 27 | (11) | 4
Foreign Exchange Contracts, Loans [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Gain (loss) recognized in income | (5) | (5) | (31)
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Gain (loss) recognized in income | $ (93) | $ (121) | $ (448)

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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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