Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net income	$ 168	$ 117
Other comprehensive income (loss):
Fair market value adjustment on cash flow hedges, net of income taxes of $1 million	2
Reclassification adjustment for net realized losses on cash flow hedges included in interest expense, net of income taxes of $1 million and $2 million	2	3
Foreign currency translation	2	(5)
Total other comprehensive income (loss)	6	(2)
Comprehensive income	$ 174	$ 115