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Investments - Summary of Financial Information in Respect of Immaterial Associates Accounted for Using Equity Method (Detail) - 12 months ended Mar. 31, 2018
₨ in Millions, $ in Millions
INR (₨)
USD ($)
Disclosure of associates [abstract]    
Carrying amount of the Company's interest in associates ₨ 1,206 $ 19
Company's share on statements of income in associates ₨ 11