v3.26.1
Long-Term Debt - Additional Information (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2025
INR (₨)
Mar. 31, 2026
USD ($)
Debt Instrument [Line Items]      
Subordinated debt, debt raised during the year ₨ 7,000.0 ₨ 8,570.0  
Other long term debt, debt raised during the year 853,672.1 652,656.3  
Perpetual debt, debt raised during the year 0.0 0.0  
Other long-term debt 4,686,148.0 5,436,429.4 $ 49,943.0
Foreign currency borrowings      
Debt Instrument [Line Items]      
Other long-term debt 714,741.6 856,647.3  
Functional currency borrowings      
Debt Instrument [Line Items]      
Other long-term debt ₨ 3,971,406.3 ₨ 4,579,782.1