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Investments, AFS debt securities - Portfolio of AFS Debt Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | ₨ 9,714,673.5 | $ 113,715.0 | ₨ 8,306,160.5
Gross Unrealized Gains | 209,610.0 | 2,453.6 | 65,491.0
Gross Unrealized Losses | 14,109.2 | 165.2 | 76,164.4
Fair Value | 9,910,174.3 | 116,003.4 | 8,295,487.1
Debt securities, other than asset and mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 9,602,070.0 |  | 8,167,306.7
Gross Unrealized Gains | 208,495.5 |  | 65,153.1
Gross Unrealized Losses | 14,041.3 |  | 75,520.9
Fair Value | 9,796,524.2 | $ 114,673.1 | 8,156,938.9
Debt securities, other than asset and mortgage-backed securities | Government of India securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 6,871,303.8 |  | 6,105,313.9
Gross Unrealized Gains | 135,750.3 |  | 41,090.5
Gross Unrealized Losses | 6,077.2 |  | 52,213.3
Fair Value | 7,000,976.9 |  | 6,094,191.1
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,646,894.8 |  | 1,188,315.0
Gross Unrealized Gains | 39,861.0 |  | 7,600.4
Gross Unrealized Losses | 2,498.1 |  | 12,234.4
Fair Value | 1,684,257.7 |  | 1,183,681.0
Debt securities, other than asset and mortgage-backed securities | Government securities outside India |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 10,280.7 |  | 3,556.3
Gross Unrealized Gains | 74.5 |  | 3.9
Gross Unrealized Losses | 0.3 |  | 18.4
Fair Value | 10,354.9 |  | 3,541.8
Debt securities, other than asset and mortgage-backed securities | Credit substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 161,308.5 |  | 133,197.8
Gross Unrealized Gains | 473.8 |  | 321.7
Gross Unrealized Losses | 602.7 |  | 2,032.6
Fair Value | 161,179.6 |  | 131,486.9
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 912,282.2 |  | 736,923.7
Gross Unrealized Gains | 32,335.9 |  | 16,136.6
Gross Unrealized Losses | 4,863.0 |  | 9,022.2
Fair Value | 939,755.1 |  | 744,038.1
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 59.4 |  | 78.1
Gross Unrealized Gains | 2.3 |  | 2.3
Gross Unrealized Losses | 0.8 |  | 1.2
Fair Value | 60.9 |  | 79.2
Asset-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 112,544.1 |  | 138,775.7
Gross Unrealized Gains | 1,112.2 |  | 335.6
Gross Unrealized Losses | 67.1 |  | 642.3
Fair Value | 113,589.2 |  | 138,469.0
Securities with gross unrealized losses |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 1,022,535.5 |  | 3,706,475.3
Securities with gross unrealized gains |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | ₨ 8,887,638.8 |  | ₨ 4,589,011.8

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