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Finance and Other Income and Foreign Exchange Gains/(Losses), Net - Summary of Finance and Other Income and Foreign Exchange Gains/(Losses), Net (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Disclosure of finance and other income and Foreign exchange gains/(losses), net [abstract]        
Interest income ₨ 17,806   ₨ 18,066 ₨ 20,364
Dividend income 609   311 66
Net gain from investments classified as FVTPL 5,410   3,822 2,991
Net gain from investments classified as FVOCI 174   220 30
Finance and other income 23,999 $ 369 22,419 23,451
Foreign exchange gains/(losses), net on financial instrument measured at FVTPL (107)   6,975 920
Other Foreign exchange gains/(losses), net 1,595   (3,198) 2,947
Foreign exchange gains/(losses), net 1,488   3,777 3,867
Finance and other income and Foreign exchange gains/(losses), net ₨ 25,487   ₨ 26,196 ₨ 27,318