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Deposits - Additional Information (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Deposits From Banking Clients [Line Items]      
Time deposits with residual maturity of one year or less ₨ 5,233,225.0 $ 69,415.4 ₨ 4,570,771.1
Time deposits ₨ 6,626,711.8 $ 87,899.1 5,317,715.9
Minimum [Member]      
Deposits From Banking Clients [Line Items]      
Maturity of deposits 1 year    
Maximum [Member]      
Deposits From Banking Clients [Line Items]      
Maturity of deposits 10 years    
Deposit in excess of Rs. 100000      
Deposits From Banking Clients [Line Items]      
Time deposits ₨ 6,397,698.1   ₨ 5,145,912.9