Debt 4 (Details) (Notional Pooling Arrangement [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Notional Pooling Arrangement [Member]
Borrowing positions outstanding under cash pooling arrangement
Total borrowing positions outstanding at beginning of year	$ 139	[1]	$ 0	[1]
Borrowings	1,143		476
Repayments	(1,139)		(331)
Foreign currency exchange effect	(7)		(6)
Total borrowing positions outstanding at end of year	$ 136	[1]	$ 139	[1]

[1] Included in “Accrued expenses and other current liabilities” in the Company’s Consolidated Balance Sheet.