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Objectives And Strategies For Using Derivatives (Narratives) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Derivative Instruments, Gain (Loss) |  |  |  |  |
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax |  |  | $ 69 |  |
Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Gain (loss) on undesignated foreign exchange hedging instruments | $ 2 | $ 23 | (8) | $ 31 |
Foreign currency exchange contracts | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Derivative, Notional Amount | 2,100 |  | 2,100 |  |
Fair Value Hedging | Interest Rate Contract |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Long-term Debt, Fair Value | 638 |  | 638 |  |
Derivative, Notional Amount | 625 |  | 625 |  |
Cash Flow Hedging | Foreign currency exchange contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Derivative, Notional Amount | 709 |  | 709 |  |
Net Investment Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Derivative, Notional Amount | 1,500 |  | 1,500 |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Derivative Asset | 79 |  | 79 |  | $ 44
Derivative Liability | $ 39 |  | $ 39 |  | $ 92

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