Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stockholders' Equity Note [Abstract]
Foreign currency translation gain (loss), gross amount	$ (10)	$ (12)	$ 0	$ 1
Foreign currency translation gain (loss), income tax (provision) benefit	4	1	(8)	(5)
Foreign currency translation gain (loss), net	(6)	(11)	(8)	(4)
Gain (loss) on cash flow hedges, gross amount	1	(19)	(50)	(22)
Gain (loss) on cash flow hedges, income tax (provision) benefit	0	6	12	6
Gain (loss) on cash flow hedges, net	1	(13)	(38)	(16)
Other Comprehensive Income (Loss), before Tax	(9)	(31)	(50)	(21)
Income tax (provision) benefit	4	7	4	1
Total other comprehensive income (loss), net of tax	$ (5)	$ (24)	$ (46)	$ (20)