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Hedging Activities (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative Asset, Notional Amount | $ 13,913 | $ 14,911
Gross Notional Value, Translated Earnings Contracts [Member] |  |
Derivative Asset, Notional Amount | 12,600 | 13,600
Gross Notional Value, Collar Options [Member] |  |
Derivative Asset, Notional Amount | 2,500 | 2,600
Gross Notional Value, Foreign Exchange Forward [Member] |  |
Derivative Asset, Notional Amount | 10,100 | 11,000
Gross Notional Value, Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Asset, Notional Amount | $ 8,500 | $ 9,100

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