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Hedging Activities (Effect on Consolidated Financial Statements) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Gain (loss) recognized in income |  | $ 182 | $ (641)
Foreign Exchange Contracts, Balance Sheet [Member] | Other Expense [Member] |  |  |
Gain (loss) recognized in income |  | (2) | (19)
Foreign Exchange Contracts, Loans [Member] | Translated Earnings Contract Gain (Loss), Net [Member] |  |  |
Gain (loss) recognized in income | [1] | $ 184 | $ (622)
[1] | The impact to income was primarily driven by yen-denominated hedges of translated earnings

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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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