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Hedging Activities (Summary of Notional Amounts and Respective Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Notional amount | $ 17,041 | $ 15,718
Asset derivatives, fair value | 255 | 265
Liability derivatives, fair value | (337) | (374)
Other Liabilities [Member] |  |
Liability derivatives, fair value | (8) | (8)
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] |  |
Notional amount | 376 | 294
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |
Asset derivatives, fair value | 12 | 20
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Asset derivatives, fair value | 2 | 1
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Notional amount | 1,136 | 599
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |
Asset derivatives, fair value | 9 | 2
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member] |  |
Liability derivatives, fair value | (8) | (7)
Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member] |  |
Notional amount | 850 | 550
Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |
Asset derivatives, fair value | 9 |
Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member] |  |
Liability derivatives, fair value | (2) |
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Notional amount | 14,679 | 14,275
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |
Asset derivatives, fair value | 159 | 176
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Asset derivatives, fair value | 64 | 66
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member] |  |
Liability derivatives, fair value | (40) | (34)
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Liability derivatives, fair value | $ (279) | $ (325)

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