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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, 2024
INR (₨)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
INR (₨)
Concentration Risk [Line Items]      
Total Exposure ₨ 29,028,502.3 $ 348,314.2 ₨ 19,671,729.4
Borrower 1      
Concentration Risk [Line Items]      
Total Exposure 301,241.8 3,614.6 284,002.5
Borrower 1 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 301,241.8   284,002.5
Borrower 1 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 0.0   0.0
Borrower 2      
Concentration Risk [Line Items]      
Total Exposure 278,173.5 3,337.8 222,101.6
Borrower 2 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 276,973.5   220,901.6
Borrower 2 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 1,200.0   1,200.0
Borrower 3      
Concentration Risk [Line Items]      
Total Exposure 220,801.0 2,649.4 205,801.0
Borrower 3 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 220,801.0   205,801.0
Borrower 3 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 0.0   0.0
Borrower 4      
Concentration Risk [Line Items]      
Total Exposure 214,797.5 2,577.4 192,489.2
Borrower 4 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 214,755.0   80,344.5
Borrower 4 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 42.5   112,144.7
Borrower 5      
Concentration Risk [Line Items]      
Total Exposure 212,970.4 2,555.4 185,299.0
Borrower 5 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 212,970.4   185,299.0
Borrower 5 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 0.0   0.0
Borrower 6      
Concentration Risk [Line Items]      
Total Exposure 188,163.3 2,257.8 176,061.5
Borrower 6 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 187,963.3   154,296.7
Borrower 6 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 200.0   21,764.8
Borrower 7      
Concentration Risk [Line Items]      
Total Exposure 175,028.1 2,100.2 155,625.7
Borrower 7 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 175,000.0   155,565.7
Borrower 7 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 28.1   60.0
Borrower 8      
Concentration Risk [Line Items]      
Total Exposure 168,999.1 2,027.8 139,808.3
Borrower 8 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 163,105.7   139,808.3
Borrower 8 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 5,893.4   0.0
Borrower 9      
Concentration Risk [Line Items]      
Total Exposure 160,539.2 1,926.3 127,590.3
Borrower 9 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 47,933.7   121,560.0
Borrower 9 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 112,605.5   6,030.3
Borrower 10      
Concentration Risk [Line Items]      
Total Exposure 145,271.0 $ 1,743.1 127,549.0
Borrower 10 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 145,250.0   112,479.0
Borrower 10 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure ₨ 21.0   ₨ 15,070.0