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Hedging Activities (Summary of Notional Amounts and Respective Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Notional amount |  | $ 13,913 | $ 14,911
Asset derivatives, fair value |  | 168 | 148
Liability derivatives, fair value |  | (280) | (442)
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Notional amount | [1] | 336 | 391
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |  |
Asset derivatives, fair value | [1] | 7 | 4
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |
Asset derivatives, fair value |  | 5 | 2
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member] |  |  |
Liability derivatives, fair value | [1] |  | (2)
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Notional amount |  | 937 | 900
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |  |
Asset derivatives, fair value |  | 2 | 5
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member] |  |  |
Liability derivatives, fair value |  | (1) | (7)
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Notional amount |  | 12,640 | 13,620
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |  |
Asset derivatives, fair value |  | 116 | 94
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |
Asset derivatives, fair value |  | 38 | 43
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member] |  |  |
Liability derivatives, fair value |  | (42) | (47)
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |
Liability derivatives, fair value |  | $ (237) | $ (386)
[1] | Cash flow hedges with a typical duration of 24 months or less.

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