Share-Based Compensation (Details 1) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2014 RSUs [Member] USD ($)	Sep. 30, 2014 RSUs [Member] INR
Number of RSUs
Outstanding as of beginning of period (shares)		4,490,860	4,490,860
Granted (shares)		1,488,960	1,488,960
Exercised (shares)		(744,386)	(744,386)
Forteited/Cancelled (shares)		(164,212)	(164,212)
Outstanding as of end of period (shares)		5,071,222	5,071,222
Grant Date Fair Value
Outstanding as of beginning of period (Indian Rupees per share)			120.42
Granted (Indian Rupees per share)			145.50
Exercised (Indian Rupees per share)			181.59
Forfeited/Cancelled (Indian Rupees per share)			129.38
Outstanding as of end of period (Indian Rupees per share)			118.50
Aggregate Intrinsic Value, Outstanding as of beginning of period		$ 11
Aggregate Intrinsic Value, Granted		0
Aggregate Intrinsic Value, Exercised		0
Aggregate Intrinsic Value, Forfeited/Cancelled	0
Aggregate Intrinsic Value, Outstanding as of end of period		$ 14