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Portfolio of Available for Sale Debt Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | ₨ 4,416,934.2 | $ 58,217.1 | ₨ 4,241,981.6
Gross Unrealized Gains | 22,472.3 | 296.2 | 57,061.0
Gross Unrealized Losses | 50,843.4 | 670.1 | 23,592.7
Fair Value | 4,388,563.1 | 57,843.2 | 4,275,449.9
Debt securities, other than asset and mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 4,273,955.4 |  | 4,084,551.2
Gross Unrealized Gains | 20,952.7 |  | 52,977.7
Gross Unrealized Losses | 50,262.6 |  | 23,281.0
Fair Value | 4,244,645.5 | $ 55,946.3 | 4,114,247.9
Debt securities, other than asset and mortgage-backed securities | Government of India securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 3,226,917.6 |  | 3,159,905.2
Gross Unrealized Gains | 10,995.6 |  | 31,824.6
Gross Unrealized Losses | 42,946.3 |  | 20,225.8
Fair Value | 3,194,966.9 |  | 3,171,504.0
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 429,146.8 |  | 348,067.7
Gross Unrealized Gains | 4,395.9 |  | 7,373.7
Gross Unrealized Losses | 5,865.9 |  | 2,669.6
Fair Value | 427,676.8 |  | 352,771.8
Debt securities, other than asset and mortgage-backed securities | Government securities outside India |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,279.2 |  | 5,932.2
Gross Unrealized Gains | 0.0 |  | 3.8
Gross Unrealized Losses | 3.4 |  | 0.0
Fair Value | 2,275.8 |  | 5,936.0
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 578,922.3 |  | 534,227.1
Gross Unrealized Gains | 5,381.4 |  | 13,423.1
Gross Unrealized Losses | 1,283.5 |  | 373.3
Fair Value | 583,020.2 |  | 547,276.9
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 36,689.5 |  | 36,419.0
Gross Unrealized Gains | 179.8 |  | 352.5
Gross Unrealized Losses | 163.5 |  | 12.3
Fair Value | 36,705.8 |  | 36,759.2
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 24.2 |  | 30.5
Gross Unrealized Gains | 0.0 |  | 1.8
Gross Unrealized Losses | 1.3 |  | 0.0
Fair Value | 22.9 |  | 32.3
Asset-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 142,954.6 |  | 157,399.9
Gross Unrealized Gains | 1,519.6 |  | 4,081.5
Gross Unrealized Losses | 579.5 |  | 311.7
Fair Value | 143,894.7 |  | 161,169.7
Securities with gross unrealized losses |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 1,791,389.0 |  | 1,162,099.9
Securities with gross unrealized gains |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | ₨ 2,597,174.1 |  | ₨ 3,113,350.0

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