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Hedging Activities (Summary of Notional Amounts and Respective Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Notional amount |  | $ 14,911 | $ 15,718
Asset derivatives, fair value |  | 148 | 265
Liability derivatives, fair value |  | (442) | (374)
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Notional amount | [1] | 391 | 294
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |  |
Asset derivatives, fair value | [1] | 4 | 20
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |
Asset derivatives, fair value | [1] | 2 | 1
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 |  | 900 | 599
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |  |
Asset derivatives, fair value |  | 5 | 2
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member] |  |  |
Liability derivatives, fair value |  | (7) | (7)
Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Notional amount |  |  | 550
Liability derivatives, fair value |  |  | (8)
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Notional amount |  | 13,620 | 14,275
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |  |
Asset derivatives, fair value |  | 94 | 176
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |
Asset derivatives, fair value |  | 43 | 66
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member] |  |  |
Liability derivatives, fair value |  | (47) | (34)
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |
Liability derivatives, fair value |  | $ (386) | $ (325)
[1] | Cash flow hedges with a typical duration of 24 months or less.

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