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Portfolio of Available for Sale Debt Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | ₨ 2,617,505.3 |  | $ 37,847.2 | ₨ 2,228,983.3
Gross Unrealized Gains | 27,846.4 |  | 402.6 | 12,080.6
Gross Unrealized Losses | 12,003.3 |  | 173.6 | 19,620.6
Fair Value | 2,633,348.4 |  | 38,076.2 | 2,221,443.3
Debt securities, other than asset and mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 2,577,245.6 |  |  | 2,209,797.0
Gross Unrealized Gains | 27,680.1 |  |  | 12,014.6
Gross Unrealized Losses | 11,880.7 |  |  | 19,261.8
Fair Value | 2,593,045.0 |  | $ 37,493.4 | 2,202,549.8
Debt securities, other than asset and mortgage-backed securities | Government of India securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 2,147,934.6 |  |  | 1,748,761.0
Gross Unrealized Gains | 21,881.4 |  |  | 9,169.5
Gross Unrealized Losses | 9,834.9 |  |  | 16,843.9
Fair Value | 2,159,981.1 |  |  | 1,741,086.6
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 144,633.7 |  |  | 123,426.9
Gross Unrealized Gains | 4,864.6 |  |  | 2,349.7
Gross Unrealized Losses | 475.7 |  |  | 729.0
Fair Value | 149,022.6 |  |  | 125,047.6
Debt securities, other than asset and mortgage-backed securities | Government securities outside India |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 7,201.6 |  |  | 4,223.8
Gross Unrealized Gains | 3.3 |  |  | 0.0
Gross Unrealized Losses | 0.0 |  |  | 6.8
Fair Value | 7,204.9 |  |  | 4,217.0
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 273,550.7 |  |  | 325,159.3
Gross Unrealized Gains | 899.9 |  |  | 495.3
Gross Unrealized Losses | 1,563.8 |  |  | 1,623.1
Fair Value | 272,886.8 |  |  | 324,031.5
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 3,925.0 |  |  | 8,226.0
Gross Unrealized Gains | 30.9 |  |  | 0.1
Gross Unrealized Losses | 6.3 |  |  | 59.0
Fair Value | 3,949.6 |  |  | 8,167.1
Mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 56.3 |  |  | 82.2
Gross Unrealized Gains | 1.0 |  |  | 2.8
Gross Unrealized Losses | 0.4 |  |  | 0.1
Fair Value | 56.9 |  |  | 84.9
Asset-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 38,827.1 |  |  | 18,966.5
Gross Unrealized Gains | 165.0 |  |  | 62.9
Gross Unrealized Losses | 122.2 |  |  | 358.7
Fair Value | 38,869.9 |  |  | 18,670.7
Other securities (including mutual fund units) |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,376.3 | [1] |  | 137.6
Gross Unrealized Gains | 0.3 | [1] |  | 0.3
Gross Unrealized Losses | 0.0 | [1] |  | 0.0
Fair Value | 1,376.6 | [1] |  | 137.9
Securities with gross unrealized losses |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair Value | 799,718.5 |  |  | 1,174,742.9
Securities with gross unrealized gains |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair Value | ₨ 1,833,629.9 |  |  | ₨ 1,046,700.4
[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. See note 2 (w)(ii) and note 14 to the Consolidated Financial Statements for additional details.

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