Accounting Policies 1 (Details) (Notional Pooling Arrangement [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
	Sep. 30, 2012		Sep. 30, 2011
Notional Pooling Arrangement [Member]
Activity under cash pooling arrangement
Total borrowing position outstanding at March 31, 2012	$ 139	[1]
Borrowings	513		164
Repayments	(481)		(97)
Foreign currency exchange effect	(7)
Total borrowing position outstanding at September 30, 2012	$ 164	[1]

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