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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, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Major components of tax expense (income) [abstract]        
Income tax expense as per the consolidated statement of income ₨ 24,799 $ 329 ₨ 25,242 ₨ 22,390
Income tax included in other comprehensive income on:        
Unrealized losses on investment securities (230)   (65) (644)
Gains/(losses) on cash flow hedging derivatives (1,165)   633 (1,448)
Defined benefit plan actuarial gains/(losses) (196)   47 255
Total income taxes ₨ 23,208   ₨ 25,857 ₨ 20,553