Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 212	$ 127	$ 501	$ 305
Other comprehensive (loss) income:
Reclassification adjustment for net realized losses on cash flow hedges included in interest expense, net of income tax provision of $1 million, $3 million, $2 million and $4 million	1	5	3	7
Foreign currency translation	(6)	0	(3)	(10)
Total other comprehensive (loss) income	(5)	5	0	(3)
Comprehensive income	$ 207	$ 132	$ 501	$ 302