v3.25.2
Concentrations of credit risk - Exposures to Ten Largest Borrowers Computed as per RBI Guidelines, Based on Higher of Outstanding Balance or Limit on Loans, Investments (Including Credit Substitutes) and Non-Funded Exposures (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
INR (₨)
Concentration Risk [Line Items]      
Total Exposure ₨ 31,442,082.5 $ 368,044.9 ₨ 29,028,502.3
Borrower 1      
Concentration Risk [Line Items]      
Total Exposure 265,155.5 3,103.8 301,241.8
Borrower 1 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 263,155.5   301,241.8
Borrower 1 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 2,000.0   0.0
Borrower 2      
Concentration Risk [Line Items]      
Total Exposure 234,939.9 2,750.1 278,173.5
Borrower 2 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 234,939.9   276,973.5
Borrower 2 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 0.0   1,200.0
Borrower 3      
Concentration Risk [Line Items]      
Total Exposure 228,114.3 2,670.2 220,801.0
Borrower 3 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 227,914.3   220,801.0
Borrower 3 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 200.0   0.0
Borrower 4      
Concentration Risk [Line Items]      
Total Exposure 225,131.7 2,635.3 214,797.5
Borrower 4 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 225,131.7   214,755.0
Borrower 4 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 0.0   42.5
Borrower 5      
Concentration Risk [Line Items]      
Total Exposure 207,225.5 2,425.7 212,970.4
Borrower 5 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 205,523.2   212,970.4
Borrower 5 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 1,702.3   0.0
Borrower 6      
Concentration Risk [Line Items]      
Total Exposure 182,922.5 2,141.2 188,163.3
Borrower 6 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 91,969.7   187,963.3
Borrower 6 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 90,952.8   200.0
Borrower 7      
Concentration Risk [Line Items]      
Total Exposure 176,032.0 2,060.5 175,028.1
Borrower 7 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 176,019.5   175,000.0
Borrower 7 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 12.5   28.1
Borrower 8      
Concentration Risk [Line Items]      
Total Exposure 173,811.1 2,034.5 168,999.1
Borrower 8 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 168,639.0   163,105.7
Borrower 8 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 5,172.1   5,893.4
Borrower 9      
Concentration Risk [Line Items]      
Total Exposure 164,937.1 1,930.7 160,539.2
Borrower 9 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 63,492.5   47,933.7
Borrower 9 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 101,444.6   112,605.5
Borrower 10      
Concentration Risk [Line Items]      
Total Exposure 154,882.6 $ 1,813.0 145,271.0
Borrower 10 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 153,855.0   145,250.0
Borrower 10 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure ₨ 1,027.6   ₨ 21.0