Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 223	$ 222	$ 609	$ 695
Other comprehensive loss:
Foreign currency translation adjustments	(30)	(78)	(51)	(162)
Total other comprehensive loss	(30)	(78)	(51)	(162)
Comprehensive income	$ 193	$ 144	$ 558	$ 533