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Objectives And Strategies For Using Derivatives (Narratives) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Gain (loss) on undesignated foreign exchange hedging instruments | $ (14) | $ (9) | $ (27) | $ (46) |
Foreign currency exchange contracts | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Aggregate notional values of outstanding derivatives | 1,700 |  | 1,700 |  |
Fair Value Hedging | Interest Rate Contract |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Aggregate notional values of outstanding derivatives | 300 |  | 300 |  |
Long-term Debt, Fair Value | 310 |  | 310 |  |
Cash Flow Hedging | Foreign currency exchange contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Aggregate notional values of outstanding derivatives | 640 |  | 640 |  |
Net Investment Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Aggregate notional values of outstanding derivatives | 1,500 |  | 1,500 |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Derivative Asset | 61 |  | 61 |  | $ 30
Derivative Liability | $ 27 |  | $ 27 |  | $ 18

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