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Derivative Instruments (Hedges of Net Investments in Foreign Operations) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivatives, Fair Value [Line Items] |  |  |
Gains Losses Deferred In Accumulated Other Comprehensive Income Loss On Derivatives | $ (29) | $ (33) | $ 87
Currency Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gains Losses Deferred In Accumulated Other Comprehensive Income Loss On Derivatives | 1 | (9) | 31
Foreign Exchange Forward [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gains Losses Deferred In Accumulated Other Comprehensive Income Loss On Derivatives | $ (30) | $ (24) | $ 56

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- Definition The current period gain (loss) recognized in other comprehensive income related to the derivatives designated in cash flow hedges. + References No definition available. + Details
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- Details
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- Details
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