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Insurance services - Summary of Bank's Aggregate Fair Value of Assets, by Major Investment Asset Category, Supporting Separate Accounts Liabilities (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2024
INR (₨)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
INR (₨)
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets ₨ 955,416.3 $ 11,464.1 ₨ 0.0
Government of India securities [Member}      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 93,097.3 1,117.0  
Other corporate/financial institution securities [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 117,615.1 1,411.3  
Total debt securities [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 210,712.4 2,528.3  
Other securities (including mutual fund units) [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 736,807.0 8,841.0  
Other net current assets [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 7,896.9 $ 94.8  
UL Life [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 790,711.5    
UL Life [Member] | Government of India securities [Member}      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 39,549.7    
UL Life [Member] | Other corporate/financial institution securities [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 74,622.2    
UL Life [Member] | Total debt securities [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 114,171.9    
UL Life [Member] | Other securities (including mutual fund units) [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 671,814.6    
UL Life [Member] | Other net current assets [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 4,725.0    
UL Pension [Member}      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 55,596.3    
UL Pension [Member} | Government of India securities [Member}      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 7,114.1    
UL Pension [Member} | Other corporate/financial institution securities [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 8,253.7    
UL Pension [Member} | Total debt securities [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 15,367.8    
UL Pension [Member} | Other securities (including mutual fund units) [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 39,955.9    
UL Pension [Member} | Other net current assets [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 272.6    
Group Linked [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 109,108.5    
Group Linked [Member] | Government of India securities [Member}      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 46,433.5    
Group Linked [Member] | Other corporate/financial institution securities [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 34,739.2    
Group Linked [Member] | Total debt securities [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 81,172.7    
Group Linked [Member] | Other securities (including mutual fund units) [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets 25,036.5    
Group Linked [Member] | Other net current assets [Member]      
Fair Value, Separate Account Investment [Line Items]      
Separate Account Assets ₨ 2,899.3