Accounts Receivable (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Receivables [Abstract]
Receivables forfaited	$ 614	$ 352	$ 235
Receivables factored	467	112	61
Forfaiting expense	2	1	1
Factoring expense	3	1	1
Forfaited receivables outstanding	137	98
Factored receivables outstanding	$ 108	$ 25