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Investments - Schedule of Investment (Parenthetical) (Detail) - INR (₨)
₨ in Millions
Mar. 31, 2018
Mar. 31, 2017
Disclosure of detailed information about financial instruments [abstract]    
Investments in liquid and short-term mutual funds ₨ 0 ₨ 117
Term deposits ₨ 453 ₨ 308