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Income Taxes - Summary of Allocation of Income Tax Expense to Comprehensive Income (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2023
INR (₨)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
INR (₨)
Mar. 31, 2021
INR (₨)
Major components of tax expense (income) [abstract]        
Income tax expense as per the statement of income ₨ 33,992 $ 414 ₨ 28,946 ₨ 30,345
Income tax included in other comprehensive income on:        
Gains/(losses) on investment securities (275)   242 226
Gains/(losses) on cash flow hedging derivatives (825)   14 1,013
Remeasurements of the defined benefit plans (16)   3 111
Total income taxes ₨ 32,876   ₨ 29,205 ₨ 31,695