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Insurance services - Summary of Bank's Liability for Future Policy Benefits on the Consolidated Balance Sheets (Detail) - Mar. 31, 2024
₨ in Millions, $ in Millions
INR (₨)
USD ($)
Liability for Future Policy Benefits [Line Items]    
Future policy benefits ₨ 1,671,384.1 $ 20,055.0
Non Par Protection [Member]    
Liability for Future Policy Benefits [Line Items]    
Future policy benefits 166,649.2 1,999.6
Non Par Riders [Member]    
Liability for Future Policy Benefits [Line Items]    
Future policy benefits 207.0 2.5
Non Par Savings [Member]    
Liability for Future Policy Benefits [Line Items]    
Future policy benefits 551,186.3 6,613.7
Non Par Pension [Member]    
Liability for Future Policy Benefits [Line Items]    
Future policy benefits 17,609.5 211.3
Individual Annuity [Member]    
Liability for Future Policy Benefits [Line Items]    
Future policy benefits 255,858.7 3,070.1
Individual Health [Member]    
Liability for Future Policy Benefits [Line Items]    
Future policy benefits 410.4 4.9
Par Life [Member]    
Liability for Future Policy Benefits [Line Items]    
Future policy benefits 561,076.4 6,732.4
Par Pension [Member]    
Liability for Future Policy Benefits [Line Items]    
Future policy benefits 16,294.1 195.5
Group Non par Life [Member]    
Liability for Future Policy Benefits [Line Items]    
Future policy benefits ₨ 102,092.5 $ 1,225.0