Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		149 Months Ended
	Jul. 15, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Stockholders' Equity Note [Abstract]
Foreign currency translation gain (loss), gross amount		$ (10)	$ (4)	$ (10)	$ (3)
Foreign currency translation gain (loss), income tax (provision) benefit		7	(3)	(1)	(8)
Foreign currency translation gain (loss), net		(3)	(7)	(11)	(11)
Gain (loss) on cash flow hedges, gross amount		6	(33)	(44)	(55)
Gain (loss) on cash flow hedges, income tax (provision) benefit		(1)	1	11	7
Gain (loss) on cash flow hedges, net		5	(32)	(33)	(48)
Other Comprehensive Income (Loss), before Tax		(4)	(37)	(54)	(58)
Income tax (provision) benefit		6	(2)	10	(1)
Total other comprehensive income (loss), net of tax		$ 2	$ (39)	(44)	(59)
Aggregate Board of Directors repurchase authorizations (in $ millions)	$ 500			$ 500	$ 1,500	$ 5,866