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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, 2020
INR (₨)
Mar. 31, 2020
USD ($)
[1]
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Mar. 31, 2020
USD ($)
Disclosure of associates [abstract]          
Carrying amount of the Company's interest in associates accounted for using the equity method ₨ 1,383   ₨ 1,235   $ 18
Company's share of net profit /(loss) of associates accounted for using the equity method in consolidated statement of income ₨ 29 ₨ (43) ₨ 11  
[1] Value is less than 1