Share-Based Compensation - SARs Activity (Details) (SARs [Member]) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Hindalco SARs [Member] USD ($)	Mar. 31, 2014 Hindalco SARs [Member] INR	Mar. 31, 2013 Hindalco SARs [Member] USD ($)	Mar. 31, 2013 Hindalco SARs [Member] INR	Mar. 31, 2014 Novelis SARs [Member] USD ($)	Mar. 31, 2014 Novelis SARs [Member] INR
Number of SARs
Outstanding, beginning of period (shares)		38,971,573	38,971,573			0	0
Granted (shares)		7,620,976	7,620,976			721,248	721,248
Exercised (shares)		(1,338,161)	(1,338,161)			(3,598)	(3,598)
Forfeited/Cancelled (shares)		(23,618,996)	(23,618,996)			(49,248)	(49,248)
Outstanding, end of period (shares)		21,635,392	21,635,392	38,971,573	38,971,573	668,402	668,402
Number of Shares, Exercisable	37,746	8,752,667	8,752,667
Weighted Average Exercise Price
Outstanding, beginning of period (Indian Rupees per share)			120.40				0.00
Granted (Indian Rupees per share)			105.56				90.01
Exercised (Indian Rupees per share)			75.45			$ 85.60
Forfeited/Cancelled (Indian Rupees per share)		$ 123.44				$ 89.21
Outstanding, end of period (Indian Rupees per share)			112.26		120.40		90.09
Weighted Average Exercise Price (in Indian Rupees), Exercisable			106.54			$ 101.81
Weighted Average Remaining Contractual Term (In years), Outstanding		4 years 4 months	4 years 4 months	4 years 9 months	4 years 9 months	5 years 4 months	5 years 4 months
Weighted Average Remaining Contractual Term (In years), Granted	7 years	6 years 0 months	6 years 0 months			5 years 4 months	5 years 4 months
Aggregate Intrinsic Value, Outstanding		$ 13		$ 2		$ 2
Aggregate Intrinsic Value, Granted		5				1
Aggregate Intrinsic Value, Exercised		$ (1)