Income Taxes 5 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Roll-forward of the Company's uncertain tax positions for all federal, state and foreign tax jurisdictions
Balance, beginning of year	$ 522	$ 415
Additions for tax positions related to the current year	26	52
Additions for tax positions from prior years	21	127
Reductions for tax positions from prior years	(17)	(33)
Settlement payments	(19)	(32)
Statute of limitations expiration	(6)	(8)
Translation and other	(4)	1
Balance, end of year	$ 523	$ 522