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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, 2024
INR (₨)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
INR (₨)
Mar. 31, 2022
INR (₨)
Major components of tax expense (income) [abstract]        
Income tax expense as per the statement of income ₨ 36,089 $ 433 ₨ 33,992 ₨ 28,946
Income tax included in other comprehensive income on:        
Gains/(losses) on investment securities 259   (275) 242
Gains/(losses) on cash flow hedging derivatives 554   (825) 14
Remeasurements of the defined benefit plans 111   (16) 3
Total income taxes ₨ 37,013   ₨ 32,876 ₨ 29,205