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Fair Value Measurements - Gains (Loss) and Interest Expense on Interest Rate Swap Contracts (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recorded in accumulated other comprehensive loss, net of tax | $ (5) | $ (4) | $ (15) | $ (9)
Interest rate swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recorded in accumulated other comprehensive loss, net of tax | 3 | 3 | (13) | 9
Interest expense recorded related to interest rate swap contracts | $ 0 | $ 0 | $ 0 | $ 2

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