v3.26.1
Goodwill and Intangible assets - Carrying Amount of Goodwill (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Goodwill [Line Items]      
Beginning ₨ 1,629,510.3 $ 17,366.6 ₨ 1,629,510.3
Goodwill on acquisition during the year 0.0 0.0 0.0
Less: Goodwill Derecognized on disposal during the year 0.0 0.0 0.0
Ending 1,629,510.3 $ 17,366.6 1,629,510.3
Retail Banking [Member]      
Goodwill [Line Items]      
Beginning 443,017.5   443,017.5
Goodwill on acquisition during the year 0.0   0.0
Less: Goodwill Derecognized on disposal during the year 0.0   0.0
Ending 443,017.5   443,017.5
Wholesale Banking [Member]      
Goodwill [Line Items]      
Beginning 71,617.3   71,617.3
Goodwill on acquisition during the year 0.0   0.0
Less: Goodwill Derecognized on disposal during the year 0.0   0.0
Ending 71,617.3   71,617.3
Treasury Services [Member]      
Goodwill [Line Items]      
Beginning 0.0   0.0
Goodwill on acquisition during the year 0.0   0.0
Less: Goodwill Derecognized on disposal during the year 0.0   0.0
Ending 0.0   0.0
Insurance Services [Member]      
Goodwill [Line Items]      
Beginning 959,080.0   959,080.0
Goodwill on acquisition during the year 0.0   0.0
Less: Goodwill Derecognized on disposal during the year 0.0   0.0
Ending 959,080.0   959,080.0
Other Segments [Member]      
Goodwill [Line Items]      
Beginning 155,795.5   155,795.5
Goodwill on acquisition during the year 0.0   0.0
Less: Goodwill Derecognized on disposal during the year 0.0   0.0
Ending ₨ 155,795.5   ₨ 155,795.5