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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, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Major components of tax expense (income) [abstract]        
Income tax expense as per the consolidated statement of income ₨ 25,242 $ 365 ₨ 22,390 ₨ 25,213
Income tax included in Other comprehensive income on:        
Unrealized gains/ (losses) on investment securities (65)   (644) 594
Gains/(losses) on cash flow hedging derivatives 633   (1,448) 962
Defined benefit plan actuarial gains/(losses) 47   255 43
Total income taxes ₨ 25,857   ₨ 20,553 ₨ 26,812