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Investments - Schedule of Investment (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Disclosure of detailed information about financial instruments [line items]      
Financial instruments at FVTOCI ₨ 191,964   ₨ 181,919
Financial instruments at amortized cost      
Financial instruments at amortized cost 21,708   28,405
Non current investments other than investments accounted for using equity method 6,916 $ 100 7,668
Current Investments 220,716 $ 3,191 249,094
Total 227,632   256,762
Financial instruments at FVTPL      
Financial instruments at FVTPL 13,960   46,438
Non-current assets [member]      
Financial instruments at amortized cost      
Non current investments other than investments accounted for using equity method 6,916   7,668
Current Assets [member]      
Financial instruments at amortized cost      
Current Investments 220,716   249,094
Investments in equity instruments [member] | Non-current assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial instruments at FVTOCI 6,916   4,140
Investments in equity instruments [member] | Current Assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial instruments at FVTOCI     1,545
Inter corporate and term deposits [member] | Non-current assets [member]      
Financial instruments at amortized cost      
Financial instruments at amortized cost     3,528
Inter corporate and term deposits [member] | Current Assets [member]      
Financial instruments at amortized cost      
Financial instruments at amortized cost 21,708   24,877
Investment in liquid and short-term mutual funds [member] | Current Assets [member]      
Financial instruments at FVTPL      
Financial instruments at FVTPL 13,960   46,438
Commercial paper, certificate of deposits and bonds [member] | Current Assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial instruments at FVTOCI ₨ 185,048   ₨ 176,234