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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, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Concentration Risk [Line Items]      
Total Exposure ₨ 10,532,317.6 $ 152,289.1 ₨ 8,598,005.1
Borrower 1      
Concentration Risk [Line Items]      
Total Exposure 152,598.3 2,206.5 90,988.2
Borrower 1 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 146,141.2   11,615.0
Borrower 1 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 6,457.1   79,373.2
Borrower 2      
Concentration Risk [Line Items]      
Total Exposure 142,578.4 2,061.6 80,093.3
Borrower 2 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 27,488.9   80,006.2
Borrower 2 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 115,089.5   87.1
Borrower 3      
Concentration Risk [Line Items]      
Total Exposure 120,317.1 1,739.7 75,973.3
Borrower 3 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 120,004.3   27,567.3
Borrower 3 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 312.8   48,406.0
Borrower 4      
Concentration Risk [Line Items]      
Total Exposure 93,471.4 1,351.5 73,422.5
Borrower 4 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 92,271.4   59,631.9
Borrower 4 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 1,200.0   13,790.6
Borrower 5      
Concentration Risk [Line Items]      
Total Exposure 80,041.1 1,157.3 70,012.7
Borrower 5 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 80,008.5   70,012.7
Borrower 5 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 32.6   0.0
Borrower 6      
Concentration Risk [Line Items]      
Total Exposure 72,447.9 1,047.5 57,070.0
Borrower 6 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 57,604.0   34,673.6
Borrower 6 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 14,843.9   22,396.4
Borrower 7      
Concentration Risk [Line Items]      
Total Exposure 67,754.9 979.7 56,378.6
Borrower 7 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 32,948.9   13,054.6
Borrower 7 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 34,806.0   43,324.0
Borrower 8      
Concentration Risk [Line Items]      
Total Exposure 66,446.8 960.8 54,750.9
Borrower 8 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 51,283.8   6,001.5
Borrower 8 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 15,163.0   48,749.4
Borrower 9      
Concentration Risk [Line Items]      
Total Exposure 66,115.6 956.0 47,667.1
Borrower 9 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 43,602.4   44,367.1
Borrower 9 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 22,513.2   3,300.0
Borrower 10      
Concentration Risk [Line Items]      
Total Exposure 56,907.0 $ 822.8 45,000.0
Borrower 10 | Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure 30,559.1   45,000.0
Borrower 10 | Non-Funded Exposure      
Concentration Risk [Line Items]      
Total Exposure ₨ 26,347.9   ₨ 0.0