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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
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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

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