Income Taxes 5 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Roll-forward of uncertain tax positions
Balance at beginning of year	$ 382	$ 523
Additions for tax positions related to the current year	20	30
Additions for tax positions from prior years	70	60
Reductions for tax positions from prior years	(233)	(158)
Settlement payments	(61)	(55)
Statute of limitations expiration	(11)	(15)
Translation and other	3	(3)
Balance at end of year	$ 170	$ 382