Fair Value Measurements - Fair Value of Hedges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Gain (loss) recorded in other comprehensive income	$ (1)	$ (5)	$ (4)	$ (10)
Interest rate swap
Derivatives, Fair Value [Line Items]
Gain (loss) recorded in other comprehensive income	2	(11)	(14)	(16)
Interest rate swap | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative fair value	30		30		$ 16
Gain (loss) recorded in other comprehensive income		2		14
Interest rate swap | Other assets
Derivatives, Fair Value [Line Items]
Derivative fair value	$ 59		$ 59		$ 41
Cross-currency interest rate swaps | Other assets
Derivatives, Fair Value [Line Items]
Gain (loss) recorded in other comprehensive income		$ (12)		$ (18)