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Derivative and Other Financial Instruments (Net Investment Hedge Narrative) (Details) € in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 EUR (€) | May 31, 2019 USD ($) | May 31, 2019 EUR (€) | Nov. 30, 2018 USD ($) | Nov. 30, 2018 EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |
Gain (loss), recognized in OCI | $ 27 | $ 47 |  |  |  |  |
Gain (loss) on net investment hedge, net of tax | 27 | 43 |  |  |  |  |
Carrying amount of hedged net investment | 1,354 |  | € 1,207 |  |  |  |
Foreign exchange |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Gain (loss), recognized in OCI | $ 26 | 11 |  |  |  |  |
Aggregate notional amount |  |  |  | $ 200 | € 179 | $ 875 | € 768
Derivative fixed rate |  |  |  |  |  | 4.75% | 4.75%
Net Investment Hedging | Euro notional value |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative fixed rate |  |  |  |  |  | 1.84% | 1.84%
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Gain (loss), recognized in OCI |  | (32) |  |  |  |  |
Gain (loss) on net investment hedge, net of tax |  | $ (9) |  |  |  |  |

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