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Fair Value Measurements - Fair Value of Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Derivatives, Fair Value [Line Items] |  |  |  |  |
Gain (loss) recorded in other comprehensive income | $ (5) | $ (4) | $ (10) | $ (5) |
Interest rate swap |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Gain (loss) recorded in other comprehensive income | (11) | $ 4 | (16) | $ 6 |
Interest rate swap | Other liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative fair value | 17 |  | 17 |  |
Gain (loss) recorded in other comprehensive income | 11 |  | 17 |  |
Interest rate swap | Other assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative fair value |  |  |  |  | $ 0
Cross-currency interest rate swaps | Other assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative fair value | 29 |  | 29 |  | $ 18
Gain (loss) recorded in other comprehensive income | $ 5 |  | $ (11) |  |

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