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Other Assets (Parenthetical) (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2022
INR (₨)
Mar. 31, 2021
INR (₨)
Mar. 31, 2022
USD ($)
Other Assets Disclosure [Line Items]      
Other assets [1] ₨ 114,420.9 ₨ 89,850.5 $ 1,508.0
Unrealized gain/(loss) recognized in non-interest revenue–other, net   7,618.1  
Unrealized gain/(loss) recognized in non-interest revenue–other, net (7,633.5)    
Equity securities      
Other Assets Disclosure [Line Items]      
Other assets 14,736.7 20,600.1  
Equity securities | Non Marketable Equity Securities [Member]      
Other Assets Disclosure [Line Items]      
Other assets ₨ 2,665.9 ₨ 999.2  
[1] Others include equity securities with carrying value amounting to Rs. 20,600.1 million and Rs. 14,736.7 million as at March 31, 2021 and March 31, 2022, respectively. Equity securities include non-marketable equity securities carried at cost of Rs. 999.2 million and Rs. 2,665.9 million as at March 31, 2021 and March 31, 2022, respectively. Unrealized gain/(loss) recognized in non-interest revenue–other, net amount to Rs. 7,618.1 million and Rs. (7,633.5) million for the years ended March 31, 2021 and March 31, 2022, respectively.