Debt 4 (Details) (Notional Pooling Arrangement, USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Notional Pooling Arrangement
Notional pooling arrangement
Total borrowings outstanding at beginning of year	$ 139	[1]	$ 136	[1]
Borrowings	5,371		3,702
Repayments	(5,207)		(3,734)
Foreign exchange effect	(165)		35
Total borrowings outstanding at end of year	$ 138	[1]	$ 139	[1]

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