Income Taxes 5 (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Roll-forward of uncertain tax positions
Balance at beginning of year	$ 134	$ 170
Additions for tax positions related to the current year	22	16
Additions for tax positions from prior years	20	23
Reductions for tax positions from prior years	(14)	(43)
Settlement payments	(16)	(5)
Statute of limitations expiration	(5)	(13)
Translation and other	2
Translation and other		(14)
Balance at end of year	$ 143	$ 134