Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 217	$ 335
Other comprehensive gain (loss):
Foreign currency translation adjustments	10	(43)
Total other comprehensive gain (loss)	10	(43)
Comprehensive income	$ 227	$ 292