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Investments, AFS debt securities - Gross Unrealized Losses and Fair Value of Available for Sale Debt Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
--- | --- | --- | ---
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | ₨ 53,658.8 | $ 628.1 | ₨ 688,638.6
Less Than 12 Months Unrealized Losses | 888.8 | 10.4 | 835.6
12 Months or Greater Fair Value | 968,876.7 | 11,341.2 | 3,017,836.7
12 Months or Greater Unrealized Losses | 13,220.4 | 154.8 | 75,328.8
Fair Value | 1,022,535.5 | 11,969.3 | 3,706,475.3
Unrealized Losses | 14,109.2 | $ 165.2 | 76,164.4
Debt securities, other than asset and mortgage-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 53,658.8 |  | 688,638.6
Less Than 12 Months Unrealized Losses | 888.8 |  | 835.6
12 Months or Greater Fair Value | 952,922.6 |  | 2,956,555.9
12 Months or Greater Unrealized Losses | 13,152.5 |  | 74,685.3
Fair Value | 1,006,581.4 |  | 3,645,194.5
Unrealized Losses | 14,041.3 |  | 75,520.9
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 | 4,657.3 |  | 566,117.5
Less Than 12 Months Unrealized Losses | 70.2 |  | 177.4
12 Months or Greater Fair Value | 542,172.0 |  | 2,179,342.3
12 Months or Greater Unrealized Losses | 6,007.0 |  | 52,035.9
Fair Value | 546,829.3 |  | 2,745,459.8
Unrealized Losses | 6,077.2 |  | 52,213.3
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 254.0 |  | 103,876.2
Less Than 12 Months Unrealized Losses | 1.6 |  | 199.2
12 Months or Greater Fair Value | 215,435.8 |  | 440,474.4
12 Months or Greater Unrealized Losses | 2,496.5 |  | 12,035.2
Fair Value | 215,689.8 |  | 544,350.6
Unrealized Losses | 2,498.1 |  | 12,234.4
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 |  | 0.0
Less Than 12 Months Unrealized Losses | 0.0 |  | 0.0
12 Months or Greater Fair Value | 854.4 |  | 814.3
12 Months or Greater Unrealized Losses | 0.3 |  | 18.4
Fair Value | 854.4 |  | 814.3
Unrealized Losses | 0.3 |  | 18.4
Debt securities, other than asset and mortgage-backed securities | Credit substitutes |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 15,060.8 |  | 5,745.3
Less Than 12 Months Unrealized Losses | 197.0 |  | 293.3
12 Months or Greater Fair Value | 48,115.3 |  | 97,997.4
12 Months or Greater Unrealized Losses | 405.7 |  | 1,739.3
Fair Value | 63,176.1 |  | 103,742.7
Unrealized Losses | 602.7 |  | 2,032.6
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 | 33,686.7 |  | 12,899.6
Less Than 12 Months Unrealized Losses | 620.0 |  | 165.7
12 Months or Greater Fair Value | 146,345.1 |  | 237,927.5
12 Months or Greater Unrealized Losses | 4,243.0 |  | 8,856.5
Fair Value | 180,031.8 |  | 250,827.1
Unrealized Losses | 4,863.0 |  | 9,022.2
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 | 10.8 |  | 13.5
12 Months or Greater Unrealized Losses | 0.8 |  | 1.2
Fair Value | 10.8 |  | 13.5
Unrealized Losses | 0.8 |  | 1.2
Asset-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 | 15,943.3 |  | 61,267.3
12 Months or Greater Unrealized Losses | 67.1 |  | 642.3
Fair Value | 15,943.3 |  | 61,267.3
Unrealized Losses | ₨ 67.1 |  | ₨ 642.3

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