v3.26.1
Long-term debt - Long-Term Debt and Related Contractual Rates and Maturity Dates (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2025
INR (₨)
Mar. 31, 2026
USD ($)
Debt Instrument [Line Items]      
Total ₨ 5,119,434.0 ₨ 5,866,163.2 $ 54,560.7
Perpetual debt—(1)      
Debt Instrument [Line Items]      
Total 147,072.0    
Subordinated debt | Subordinated debt (other than perpetual debt)      
Debt Instrument [Line Items]      
Total 301,895.6 293,902.2 3,217.5
Subordinated debt | Perpetual debt—(1)      
Debt Instrument [Line Items]      
Total ₨ 52,289.7 ₨ 52,272.7 $ 557.3
Subordinated debt | Perpetual debt—(2)      
Debt Instrument [Line Items]      
Maturity /Call dates 2027 2027  
Stated interest rates 3.70% 3.70% 3.70%
Total ₨ 94,782.3 ₨ 85,291.5 $ 1,010.1
Subordinated debt | Minimum | Subordinated debt (other than perpetual debt)      
Debt Instrument [Line Items]      
Maturity /Call dates 2027 2026  
Stated interest rates 6.67% 6.67% 6.67%
Subordinated debt | Minimum | Perpetual debt—(1)      
Debt Instrument [Line Items]      
Maturity /Call dates 2027 2026  
Stated interest rates 7.55% 7.55% 7.55%
Subordinated debt | Maximum | Subordinated debt (other than perpetual debt)      
Debt Instrument [Line Items]      
Maturity /Call dates 2036 2035  
Stated interest rates 9.70% 9.70% 9.70%
Subordinated debt | Maximum | Perpetual debt—(1)      
Debt Instrument [Line Items]      
Maturity /Call dates 2035 2034  
Stated interest rates 9.40% 9.40% 9.40%
Others | Variable rate—(1)      
Debt Instrument [Line Items]      
Total [1] ₨ 502,625.5 ₨ 581,229.3 $ 5,356.8
Others | Variable rate—(2)      
Debt Instrument [Line Items]      
Total [1] 458,419.1 623,118.6 4,885.6
Others | Fixed rate-(1)      
Debt Instrument [Line Items]      
Total [1] 3,497,412.7 3,955,489.6 37,273.9
Others | Fixed rate-(2)      
Debt Instrument [Line Items]      
Total [1] ₨ 212,009.1 ₨ 274,859.3 $ 2,259.5
Others | Minimum | Variable rate—(1)      
Debt Instrument [Line Items]      
Maturity /Call dates [1] 2027 2026  
Stated interest rates [1] 3.94% 4.92% 3.94%
Others | Minimum | Variable rate—(2)      
Debt Instrument [Line Items]      
Maturity /Call dates [1] 2027 2026  
Stated interest rates [1] 4.56% 6.47% 4.56%
Others | Minimum | Fixed rate-(1)      
Debt Instrument [Line Items]      
Maturity /Call dates [1] 2027 2026  
Stated interest rates [1] 2.80% 2.80% 2.80%
Others | Minimum | Fixed rate-(2)      
Debt Instrument [Line Items]      
Maturity /Call dates [1] 2027 2026  
Stated interest rates [1] 3.55% 4.30% 3.55%
Others | Maximum | Variable rate—(1)      
Debt Instrument [Line Items]      
Maturity /Call dates [1] 2030 2030  
Stated interest rates [1] 4.79% 6.22% 4.79%
Others | Maximum | Variable rate—(2)      
Debt Instrument [Line Items]      
Maturity /Call dates [1] 2033 2032  
Stated interest rates [1] 8.30% 8.60% 8.30%
Others | Maximum | Fixed rate-(1)      
Debt Instrument [Line Items]      
Maturity /Call dates [1] 2034 2034  
Stated interest rates [1] 9.05% 9.05% 9.05%
Others | Maximum | Fixed rate-(2)      
Debt Instrument [Line Items]      
Maturity /Call dates [1] 2029 2029  
Stated interest rates [1] 8.19% 8.19% 8.19%
[1] Variable rate — (1), Perpetual debt — (2) and Fixed rate — (2) represent foreign currency debt. Variable rate debt is typically indexed to the secured overnight financing rate, T-bill rates, and Marginal cost of funds based lending rates (“MCLR”), among others.