Other Income, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Other Nonoperating Income (Expense) [Abstract]
Interest income	$ 18	$ 20	$ 16
Equity in earnings, net	15	12	0
Other, net	25	31	16
Total	$ 58	$ 63	$ 32