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Hedging Activities (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Derivative Asset, Notional Amount | $ 17,041 | $ 15,718
Gross Notional Value, Translated Earnings Contracts [Member] |  |
Derivative Asset, Notional Amount | 14,700 | 14,300
Gross Notional Value, Collar Options [Member] |  |
Derivative Asset, Notional Amount | 2,600 | 1,300
Gross Notional Value, Foreign Exchange Forward [Member] |  |
Derivative Asset, Notional Amount | 12,100 | 13,000
Gross Notional Value, Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Asset, Notional Amount | $ 9,700 | $ 11,700

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 + Details
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