Debt - Short-term Borrowings (Details)												12 Months Ended
	Mar. 31, 2014 USD ($)	May 31, 2013 Facilities	Mar. 31, 2013 USD ($)	Mar. 31, 2014 ABL Facility [Member] USD ($)	Mar. 31, 2014 Short-term Loan [Member] ABL Facility [Member] USD ($)	Mar. 31, 2014 Novelis Korea Bank Loan [Member] USD ($)	Mar. 31, 2014 Novelis Korea Bank Loan [Member] KRW	Mar. 31, 2014 Novelis Brazil Loan [Member] USD ($)	Mar. 31, 2014 Novelis Vietnam Loan [Member] [Member] USD ($)	Mar. 31, 2014 Novelis Vietnam Loan [Member] [Member] VND	Mar. 31, 2014 Bank Overdrafts [Member] USD ($)	Mar. 31, 2014 Novelis Korea Bank Loan Borrowing Capacity [Member] First Korean Revolver [Member] USD ($) Facilities	Mar. 31, 2014 Novelis Korea Bank Loan Borrowing Capacity [Member] First Korean Revolver [Member] KRW	Mar. 31, 2014 Novelis Korea Bank Loan Borrowing Capacity [Member] Second Korean Revolver [Member] USD ($)	Mar. 31, 2014 Novelis Korea Bank Loan Borrowing Capacity [Member] Second Korean Revolver [Member] KRW	Mar. 31, 2014 Novelis Korea Bank Loan Borrowing Capacity [Member] Third Korean Revolver [Member] [Domain] USD ($)	Mar. 31, 2014 Novelis Korea Bank Loan Borrowing Capacity [Member] Third Korean Revolver [Member] [Domain] KRW
Debt Instrument [Line Items]
Short-term borrowings	$ 723,000,000		$ 468,000,000		$ 546,000,000	$ 47,000,000	50,000,000,000	$ 108,000,000	$ 20,000,000	429,000,000,000	$ 2,000,000	$ 28,000,000	30,000,000,000	$ 47,000,000	50,000,000,000	$ 56,000,000	60,000,000,000
Short-term debt, weighted average interest rate	3.58%		3.30%
Letters of credit outstanding amount				17,000,000
Remaining borrowing capacity				380,000,000
Number of instruments entered		2										1	1
Basis spread on variable rate												1.60%	1.60%	1.25%	1.25%	1.25%	1.25%
Amount outstanding	$ 0															$ 0