v3.25.2
Goodwill and Intangible assets - Carrying Amount of Goodwill (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
INR (₨)
Goodwill [Line Items]      
Begining ₨ 1,629,510.3 $ 19,074.2 ₨ 74,937.9
Goodwill on acquisition during the year 0.0 0.0 1,628,148.5
Less: Goodwill Derecognised on disposal during the year 0.0 0.0 73,576.1
Ending 1,629,510.3 $ 19,074.2 1,629,510.3
Retail Banking [Member]      
Goodwill [Line Items]      
Begining 443,017.5   74,937.9
Goodwill on acquisition during the year 0.0   368,079.6
Less: Goodwill Derecognised on disposal during the year 0.0   0.0
Ending 443,017.5   443,017.5
Wholesale Banking [Member]      
Goodwill [Line Items]      
Begining 71,617.3   0.0
Goodwill on acquisition during the year 0.0   71,617.3
Less: Goodwill Derecognised on disposal during the year 0.0   0.0
Ending 71,617.3   71,617.3
Treasury Services [Member]      
Goodwill [Line Items]      
Begining 0.0   0.0
Goodwill on acquisition during the year 0.0   0.0
Less: Goodwill Derecognised on disposal during the year 0.0   0.0
Ending 0.0   0.0
Insurance Services [Member]      
Goodwill [Line Items]      
Begining 959,080.0   0.0
Goodwill on acquisition during the year 0.0   959,080.0
Less: Goodwill Derecognised on disposal during the year 0.0   0.0
Ending 959,080.0   959,080.0
Other Segments [Member]      
Goodwill [Line Items]      
Begining 155,795.5   0.0
Goodwill on acquisition during the year 0.0   229,371.6
Less: Goodwill Derecognised on disposal during the year 0.0   73,576.1
Ending ₨ 155,795.5   ₨ 155,795.5