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Non-Interest Revenue - Summary of Disaggregation of Revenue (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Disaggregation of Revenue [Line Items]        
Fees and commissions ₨ 160,099.5 $ 2,123.6 ₨ 134,155.2 ₨ 120,060.9
Deposit Related Fees        
Disaggregation of Revenue [Line Items]        
Fees and commissions 29,031.9 385.1 25,383.0 22,424.9
Lending related fees        
Disaggregation of Revenue [Line Items]        
Fees and commissions 30,699.9 407.2 30,176.2 31,791.6
Third-party products related fees        
Disaggregation of Revenue [Line Items]        
Fees and commissions 28,169.6 373.7 22,000.4 20,908.1
Payments and cards business fees        
Disaggregation of Revenue [Line Items]        
Fees and commissions 58,899.3 781.3 47,012.4 34,551.4
Other        
Disaggregation of Revenue [Line Items]        
Fees and commissions ₨ 13,298.8 $ 176.3 ₨ 9,583.2 ₨ 10,384.9