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Carrying Amount of Goodwill (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2024
INR (₨)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
INR (₨)
Mar. 31, 2023
USD ($)
Goodwill [Line Items]        
Begining ₨ 74,937.9 $ 899.3 ₨ 74,937.9 $ 899.3
Goodwill on acquisition during the year 1,628,148.5 19,536.2    
Less: Goodwill Derecognised on disposal during the year 73,576.1 882.9    
Ending 1,629,510.3 $ 19,552.6 74,937.9 $ 899.3
Retail Banking [Member]        
Goodwill [Line Items]        
Begining 74,937.9   74,937.9  
Goodwill on acquisition during the year 368,079.6      
Less: Goodwill Derecognised on disposal during the year 0.0      
Ending 443,017.5   74,937.9  
Wholesale Banking [Member]        
Goodwill [Line Items]        
Begining 0.0   0.0  
Goodwill on acquisition during the year 71,617.3      
Less: Goodwill Derecognised on disposal during the year 0.0      
Ending 71,617.3   0.0  
Treasury Services [Member]        
Goodwill [Line Items]        
Begining 0.0   0.0  
Goodwill on acquisition during the year 0.0    
Less: Goodwill Derecognised on disposal during the year 0.0      
Ending 0.0   0.0  
Insurance Services [Member]        
Goodwill [Line Items]        
Begining 0.0   0.0  
Goodwill on acquisition during the year 959,080.0      
Less: Goodwill Derecognised on disposal during the year 0.0      
Ending 959,080.0   0.0  
Other Segments [Member]        
Goodwill [Line Items]        
Begining 0.0   0.0  
Goodwill on acquisition during the year 229,371.6      
Less: Goodwill Derecognised on disposal during the year 73,576.1      
Ending ₨ 155,795.5   ₨ 0.0