Derivative Instruments - Schedule of Gains and Losses Recognized on the Statements of Income for Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives	$ (15)	$ (22)	$ 39	$ 19
Amount of Gain Reclassified from AOCI into Net Income	(2)	(3)	4	0
Amount of Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	2	0	5	4
Cross-currency swap agreements | Derivatives designated as hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives	(2)	(3)	4	5
Amount of Gain Reclassified from AOCI into Net Income	(2)	(3)	4	0
Amount of Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	0	0	0	0
Cross-currency swap agreements | Derivatives not designated as hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives	(13)	(19)	35	19
Amount of Gain Reclassified from AOCI into Net Income	0	0	0	0
Amount of Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	$ 2	$ 0	5	4
Interest rate swaps | Derivatives designated as hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives			0	(5)
Amount of Gain Reclassified from AOCI into Net Income			0	0
Amount of Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)			$ 0	$ 0