Share-Based Compensation (Details Textual) (USD $) In Millions, unless otherwise specified				12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2014 SARs [Member]	Mar. 31, 2014 SARs [Member] Hindalco SARs [Member]	Mar. 31, 2014 SARs [Member] Novelis SARs [Member]	Mar. 31, 2014 SARs [Member] Minimum [Member]	Mar. 31, 2014 RSUs [Member]
Share Based Compensation [Abstract]
Vesting rate				25.00%
Expiration period (years)				7 years	6 years 0 months	5 years 4 months
Terms of award				The amount of cash paid to settle Hindalco SARs and Novelis SARs are limited to two and a half or three times the target payout				The payout on the RSUs is limited to three times the market value of one Hindalco share measured on the original date of grant.
Award vesting rate based on targeted EBITDA							75.00%
Vesting period (years)								3 years
Total share-based liabilities paid	$ 15	$ 2	$ 9					$ 2
Unrecognized compensation expense					$ 8	$ 10		$ 6
Unrecognized compensation expense, weighted average period of recognition (years)					2 years 8 months	2 years 8 months		1 year 5 months