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Investments - Schedule of Investment (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Disclosure of detailed information about financial instruments [line items]      
Financial instrument at FVTPL ₨ 46,438   ₨ 105,244
Financial instruments at FVTOCI 181,919   150,917
Financial instruments at amortized cost 28,405   42,972
Investments, Total 256,762   299,133
Non-current 7,668 $ 118 7,103
Current 249,094 $ 3,826 292,030
Investments, Total 256,762   299,133
Investment in liquid and short-term mutual funds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial instrument at FVTPL 46,438   104,675
Other Investments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial instrument at FVTPL     569
Investments in equity instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial instruments at FVTOCI 5,685   5,303
Commercial paper, certificate of deposits and bonds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial instruments at FVTOCI ₨ 176,234   ₨ 145,614