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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, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Major components of tax expense (income) [abstract]        
Income tax expense as per the consolidated statement of income ₨ 22,390 $ 344 ₨ 25,213 ₨ 25,366
Income tax included in Other comprehensive income on:        
Unrealized gains/ (losses) on investment securities (644)   594 42
Gains/(losses) on cash flow hedging derivatives (1,448)   962 (260)
Defined benefit plan actuarial gains/(losses) 255   43 (224)
Total income taxes ₨ 20,553   ₨ 26,812 ₨ 24,924