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Long-Term Debt - Additional Information (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2024
INR (₨)
Mar. 31, 2023
INR (₨)
Mar. 31, 2024
USD ($)
Debt Instrument [Line Items]      
Subordinated debt, debt raised during the year ₨ 20,000.0 ₨ 200,000.0  
Other long term debt, debt raised during the year 1,132,275.2 792,933.1  
Perpetual debt, debt raised during the year 3,500.0 30,000.0  
Other long-term debt [1] 6,244,131.6 1,681,587.2 $ 74,923.6
Foreign currency borrowings      
Debt Instrument [Line Items]      
Other long-term debt 693,914.0 157,092.6  
Functional currency borrowings      
Debt Instrument [Line Items]      
Other long-term debt ₨ 5,550,217.6 ₨ 1,524,494.6  
[1] Includes securities sold under repurchase agreements amounting to Rs. 90,200.0 million with a stated interest rate of 4.2% per annum for fiscal year ended March 31, 2023 and nil for the fiscal year ended March 31, 2024, under RBI long-term repo operation with a three-year maturity period. Increase in outstanding balance of Long-term debt – other as of March 31, 2024 is essentially on account of the Transaction (Refer note 3).