Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 208	$ 223	$ 618	$ 609
Other comprehensive loss:
Foreign currency translation adjustments	(83)	(30)	(102)	(51)
Total other comprehensive loss	(83)	(30)	(102)	(51)
Comprehensive income	$ 125	$ 193	$ 516	$ 558