Income Taxes 5 (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Roll-forward of uncertain tax positions
Balance at beginning of year	$ 132	$ 143
Additions for tax positions related to the current year	11	13
Additions for tax positions from prior years	25	4
Reductions for tax positions from prior years	(8)	(9)
Settlement payments	(16)	(3)
Statute of limitations expiration	(16)	(13)
Translation and other	5
Translation and other		(3)
Balance at end of year	$ 133	$ 132