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Derivative and Other Financial Instruments (Net Investment Hedge Narrative) (Details) € in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 EUR (€) | May 31, 2019 USD ($) | Nov. 30, 2018 USD ($)
Derivative [Line Items] |  |  |  |  |
Gain (loss), recognized in OCI | $ 1 | $ 27 |  |  |
Gain (loss) on net investment hedge, net of tax | 1 | 27 |  |  |
Carrying amount of hedged net investment | 1,359 |  | € 1,113 |  |
Foreign exchange |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (loss), recognized in OCI | (48) | $ 26 |  |  |
Aggregate notional amount |  |  |  | $ 200 | $ 875
Derivative fixed rate |  |  |  |  | 4.75%
Net Investment Hedging | Euro notional value |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative fixed rate |  |  |  |  | 1.84%
Accumulated Other Comprehensive Loss |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (loss), recognized in OCI | (33) |  |  |  |
Gain (loss) on net investment hedge, net of tax | $ (10) |  |  |  |

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