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Non-Interest Revenue - Summary of Disaggregation of Revenue (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2021
INR (₨)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
INR (₨)
Mar. 31, 2019
INR (₨)
Disaggregation of Revenue [Line Items]        
Fees and commissions ₨ 165,410.4 $ 2,261.6 ₨ 160,099.5 ₨ 134,155.2
Deposit Related Fees        
Disaggregation of Revenue [Line Items]        
Fees and commissions 28,150.4 384.9 29,031.9 25,383.0
Lending related fees        
Disaggregation of Revenue [Line Items]        
Fees and commissions 30,973.1 423.5 30,699.9 30,176.2
Third-party products related fees        
Disaggregation of Revenue [Line Items]        
Fees and commissions 35,733.0 488.6 28,169.6 22,000.4
Payments and cards business fees        
Disaggregation of Revenue [Line Items]        
Fees and commissions 50,758.2 694.0 58,899.3 47,012.4
Other        
Disaggregation of Revenue [Line Items]        
Fees and commissions ₨ 19,795.7 $ 270.6 ₨ 13,298.8 ₨ 9,583.2