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Investments - Schedule of Investment (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Disclosure of detailed information about financial instruments [line items]      
Financial instruments at FVTOCI ₨ 164,884   ₨ 191,964
Financial instruments at amortized cost      
Financial instruments at amortized cost 19,258   21,708
Non current investments other than investments accounted for using equity method 9,302 $ 123 6,916
Current Investments 189,635 $ 2,515 220,716
Total 198,937   227,632
Financial instruments at FVTPL 14,795   13,960
Non-current assets [member]      
Financial instruments at amortized cost      
Non current investments other than investments accounted for using equity method 9,302   6,916
Current Assets [member]      
Financial instruments at amortized cost      
Current Investments 189,635   220,716
Investments in equity instruments [member] | Non-current assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial instruments at FVTOCI 9,297   6,916
Inter corporate and term deposits [member] | Non-current assets [member]      
Financial instruments at amortized cost      
Financial instruments at amortized cost 5    
Inter corporate and term deposits [member] | Current Assets [member]      
Financial instruments at amortized cost      
Financial instruments at amortized cost 19,253   21,708
Investment in liquid and short-term mutual funds [member] | Current Assets [member]      
Financial instruments at amortized cost      
Financial instruments at FVTPL 14,795   13,960
Commercial paper, certificate of deposits and bonds [member] | Current Assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial instruments at FVTOCI ₨ 155,587   ₨ 185,048