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Gross Unrealized Losses and Fair Value of Available for Sale Debt Securities (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2024
INR (₨)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
INR (₨)
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value ₨ 688,638.6 $ 8,263.0 ₨ 1,500,675.9
Less Than 12 Months Unrealized Losses 835.6 10.0 19,859.2
12 Months or Greater Fair Value 3,017,836.7 36,211.1 1,719,897.9
12 Months or Greater Unrealized Losses 75,328.8 903.9 87,055.4
Fair Value 3,706,475.3 44,474.1 3,220,573.8
Unrealized Losses 76,164.4 $ 913.9 106,914.6
Debt securities, other than asset and mortgage-backed securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 688,638.6   1,390,130.2
Less Than 12 Months Unrealized Losses 835.6   18,781.9
12 Months or Greater Fair Value 2,956,555.9   1,693,782.3
12 Months or Greater Unrealized Losses 74,685.3   86,239.5
Fair Value 3,645,194.5   3,083,912.5
Unrealized Losses 75,520.9   105,021.4
Debt securities, other than asset and mortgage-backed securities | Government of India securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 566,117.5   1,038,004.8
Less Than 12 Months Unrealized Losses 177.4   12,622.5
12 Months or Greater Fair Value 2,179,342.3   1,266,775.4
12 Months or Greater Unrealized Losses 52,035.9   67,722.0
Fair Value 2,745,459.8   2,304,780.2
Unrealized Losses 52,213.3   80,344.5
Debt securities, other than asset and mortgage-backed securities | State government securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 103,876.2   75,707.7
Less Than 12 Months Unrealized Losses 199.2   1,923.6
12 Months or Greater Fair Value 440,474.4   270,099.2
12 Months or Greater Unrealized Losses 12,035.2   13,681.2
Fair Value 544,350.6   345,806.9
Unrealized Losses 12,234.4   15,604.8
Debt securities, other than asset and mortgage-backed securities | Government securities outside India      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 0.0   797.2
Less Than 12 Months Unrealized Losses 0.0   21.8
12 Months or Greater Fair Value 814.3   0.0
12 Months or Greater Unrealized Losses 18.4   0.0
Fair Value 814.3   797.2
Unrealized Losses 18.4   21.8
Debt securities, other than asset and mortgage-backed securities | Credit substitutes      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 5,745.3   254,023.6
Less Than 12 Months Unrealized Losses 293.3   3,771.0
12 Months or Greater Fair Value 97,997.4   152,702.6
12 Months or Greater Unrealized Losses 1,739.3   4,708.0
Fair Value 103,742.7   406,726.2
Unrealized Losses 2,032.6   8,479.0
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 12,899.6   21,596.9
Less Than 12 Months Unrealized Losses 165.7   443.0
12 Months or Greater Fair Value 237,927.5   4,205.1
12 Months or Greater Unrealized Losses 8,856.5   128.3
Fair Value 250,827.1   25,802.0
Unrealized Losses 9,022.2   571.3
Mortgage-backed securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 0.0   0.0
Less Than 12 Months Unrealized Losses 0.0   0.0
12 Months or Greater Fair Value 13.5   17.5
12 Months or Greater Unrealized Losses 1.2   1.8
Fair Value 13.5   17.5
Unrealized Losses 1.2   1.8
Asset-backed securities      
Gain (Loss) on Securities [Line Items]      
Less Than 12 Months Fair Value 0.0   110,545.7
Less Than 12 Months Unrealized Losses 0.0   1,077.3
12 Months or Greater Fair Value 61,267.3   26,098.1
12 Months or Greater Unrealized Losses 642.3   814.1
Fair Value 61,267.3   136,643.8
Unrealized Losses ₨ 642.3   ₨ 1,891.4