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Earnings Per Equity Share - Summary of Basic Earnings Per Share (Detail)
₨ / shares in Units, $ / shares in Units, ₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
INR (₨)
₨ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
INR (₨)
₨ / shares
shares
Mar. 31, 2018
INR (₨)
₨ / shares
shares
Earnings per share [abstract]        
Profit attributable to equity holders of the Company ₨ 97,218 $ 1,288 ₨ 90,031 ₨ 80,081
Weighted average number of equity shares outstanding 5,833,384,018 5,833,384,018 6,007,376,837 6,333,391,200
Basic earnings per share | (per share) ₨ 16.67 $ 0.22 ₨ 14.99 ₨ 12.64