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Portfolio of Available for Sale Debt Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | ₨ 3,340,732.3 | $ 44,312.6 | ₨ 2,617,505.3 |
Gross Unrealized Gains | 68,285.4 | 905.8 | 27,846.4 |
Gross Unrealized Losses | 2,728.5 | 36.2 | 12,003.3 |
Fair Value | 3,406,289.2 | 45,182.2 | 2,633,348.4 |
Debt securities, other than asset and mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 3,213,339.7 |  | 2,577,245.6 |
Gross Unrealized Gains | 66,538.4 |  | 27,680.1 |
Gross Unrealized Losses | 2,578.5 |  | 11,880.7 |
Fair Value | 3,277,299.6 | $ 43,471.3 | 2,593,045.0 |
Debt securities, other than asset and mortgage-backed securities | Government of India securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 2,637,464.4 |  | 2,147,934.6 |
Gross Unrealized Gains | 52,630.0 |  | 21,881.4 |
Gross Unrealized Losses | 1,491.6 |  | 9,834.9 |
Fair Value | 2,688,602.8 |  | 2,159,981.1 |
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 177,055.9 |  | 144,633.7 |
Gross Unrealized Gains | 11,337.7 |  | 4,864.6 |
Gross Unrealized Losses | 0.0 |  | 475.7 |
Fair Value | 188,393.6 |  | 149,022.6 |
Debt securities, other than asset and mortgage-backed securities | Government securities outside India |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 8,367.0 |  | 7,201.6 |
Gross Unrealized Gains | 48.4 |  | 3.3 |
Gross Unrealized Losses | 0.0 |  | 0.0 |
Fair Value | 8,415.4 |  | 7,204.9 |
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 360,741.5 |  | 273,550.7 |
Gross Unrealized Gains | 2,309.5 |  | 899.9 |
Gross Unrealized Losses | 677.3 |  | 1,563.8 |
Fair Value | 362,373.7 |  | 272,886.8 |
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 29,710.9 |  | 3,925.0 |
Gross Unrealized Gains | 212.8 |  | 30.9 |
Gross Unrealized Losses | 409.6 |  | 6.3 |
Fair Value | 29,514.1 |  | 3,949.6 |
Mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 37.3 |  | 56.3 |
Gross Unrealized Gains | 0.8 |  | 1.0 |
Gross Unrealized Losses | 0.0 |  | 0.4 |
Fair Value | 38.1 |  | 56.9 |
Asset-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 125,931.2 |  | 38,827.1 |
Gross Unrealized Gains | 1,746.0 |  | 165.0 |
Gross Unrealized Losses | 150.0 |  | 122.2 |
Fair Value | 127,527.2 |  | 38,869.9 |
Other securities (including mutual fund units) |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,424.1 |  | 1,376.3 | [1]
Gross Unrealized Gains | 0.2 |  | 0.3 | [1]
Gross Unrealized Losses | 0.0 |  | 0.0 | [1]
Fair Value | 1,424.3 |  | 1,376.6 | [1]
Securities with gross unrealized losses |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair Value | 300,932.1 |  | 799,718.5 |
Securities with gross unrealized gains |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair Value | ₨ 3,105,357.1 |  | ₨ 1,833,629.9 |
[1] | The Bank adopted ASU 2016-01 and ASU 2018-03 as of April 1, 2018, resulting in a cumulative effect adjustment from AOCI to retained earnings for net unrealized gains on marketable equity securities AFS. The available-for sale category was eliminated for equity securities amortized cost Rs. 855.6 million and carrying value Rs. 1,267.7 million effective April 1, 2018.

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