Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Stockholders' Equity Note [Abstract]
Foreign currency translation gain (loss), gross amount	$ 10	$ 13
Foreign currency translation gain (loss), income tax (provision) benefit	(12)	(6)
Foreign currency translation gain (loss), net	(2)	7
Gain (loss) on cash flow hedges, gross amount	(51)	(3)
Gain (loss) on cash flow hedges, income tax (provision) benefit	12	0
Gain (loss) on cash flow hedges, net	(39)	(3)
Other Comprehensive Income (Loss), before Tax	(41)	10
Income tax (provision) benefit	0	(6)
Total other comprehensive income (loss), net of tax	$ (41)	$ 4