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Accounts Receivable (Factoring Activities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Receivables [Abstract]
Receivables factored	$ 1,796nvl_ReceivablesFactored	$ 1,081nvl_ReceivablesFactored	$ 464nvl_ReceivablesFactored
Factoring expense	10nvl_FactoringExpense	5nvl_FactoringExpense	2nvl_FactoringExpense
Factored receivables outstanding	$ 591nvl_FactoredReceivablesOutstanding	$ 245nvl_FactoredReceivablesOutstanding