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Investments - Summary of Financial Information in Respect of Immaterial Associates Accounted for Using Equity Method (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2019
USD ($)
Disclosure of associates [abstract]        
Carrying amount of the Company's interest in associates accounted for using the equity method ₨ 1,235   ₨ 1,206 $ 18
Company's share of net profit /(loss) of associates accounted for using the equity method in consolidated statement of income ₨ (43) $ (1) ₨ 11