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Investments - Schedule of Investment (Parenthetical) (Detail) - INR (₨)
₨ in Millions
Mar. 31, 2020
Mar. 31, 2019
Disclosure of detailed information about financial instruments [abstract]    
Term Deposits in Lien with banks-Current ₨ 796 ₨ 463
Term Deposits in Lien with banks-Non-Current ₨ 5