Derivative Instruments - Schedule of Gains and Losses Recognized on Consolidated Statements of Operations for Derivative Instruments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative	$ 65,000,000	$ (111,000,000)	$ (7,000,000)
Amount of Gain (Loss) Reclassified from AOCI into Net Income	17,000,000	(3,000,000)	0
Amount of Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	5,000,000	8,000,000
Derivatives designated as net investment hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain (loss) recognized in earnings	4,000,000	(64,000,000)	43,000,000
Cross-currency swap agreements | Derivatives designated as cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative	13,000,000	(21,000,000)	0
Amount of Gain (Loss) Reclassified from AOCI into Net Income	17,000,000	(3,000,000)
Amount of Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	1,000,000	0
Pre-tax gain (loss) recognized in earnings	(2,000,000)	(3,000,000)
Cross-currency swap agreements | Derivatives designated as net investment hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative	52,000,000	(100,000,000)	15,000,000
Amount of Gain (Loss) Reclassified from AOCI into Net Income	0	0
Amount of Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	4,000,000	8,000,000
Pre-tax gain (loss) recognized in earnings	32,000,000	44,000,000
Interest rate swaps | Derivatives designated as cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative	0	2,000,000	5,000,000
Amount of Gain (Loss) Reclassified from AOCI into Net Income	0	0
Amount of Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	0	0
Foreign currency denominated notes | Derivatives designated as net investment hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative	0	8,000,000	$ (27,000,000)
Amount of Gain (Loss) Reclassified from AOCI into Net Income	0	0
Amount of Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	$ 0	$ 0