Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 930	$ 712	$ 754
Other comprehensive (loss) income:
Reclassification adjustment for net realized losses on cash flow hedges included in interest expense, net of income tax provision of $5 million, $6 million and $6 million	7	10	8
Foreign currency translation	(9)	(21)	(11)
Total other comprehensive loss	(2)	(11)	(3)
Comprehensive income	$ 928	$ 701	$ 751