Debt 4 (Details) - Notional Pooling Arrangement - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Notional pooling arrangement
Total borrowings outstanding at beginning of year	[1]	$ 138	$ 139
Borrowings		3,899	5,371
Repayments		(3,877)	(5,207)
Foreign exchange effect		(21)	(165)
Total borrowings outstanding at end of year	[1]	$ 139	$ 138

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