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Portfolio of Available for Sale Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | ₨ 2,229,838.9 | $ 34,247.3 | ₨ 2,072,759.4
Gross Unrealized Gains | 12,493.1 | 191.9 | 42,636.2
Gross Unrealized Losses | 19,621.0 | 301.4 | 4,010.0
Fair Value | 2,222,711.0 | 34,137.8 | 2,111,385.6
Debt securities, other than asset and mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,209,797.0 |  | 2,049,111.1
Gross Unrealized Gains | 12,014.6 |  | 41,774.7
Gross Unrealized Losses | 19,261.8 |  | 3,561.2
Fair Value | 2,202,549.8 | $ 33,828.1 | 2,087,324.6
Debt securities, other than asset and mortgage-backed securities | Government of India securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,748,761.0 |  | 1,528,484.8
Gross Unrealized Gains | 9,169.5 |  | 35,196.3
Gross Unrealized Losses | 16,843.9 |  | 2,811.3
Fair Value | 1,741,086.6 |  | 1,560,869.8
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 123,426.9 |  | 90,652.8
Gross Unrealized Gains | 2,349.7 |  | 5,537.0
Gross Unrealized Losses | 729.0 |  | 0.0
Fair Value | 125,047.6 |  | 96,189.8
Debt securities, other than asset and mortgage-backed securities | Government securities outside India |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 4,223.8 |  |
Gross Unrealized Losses | 6.8 |  |
Fair Value | 4,217.0 |  |
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 325,159.3 |  | 419,320.5
Gross Unrealized Gains | 495.3 |  | 957.9
Gross Unrealized Losses | 1,623.1 |  | 737.8
Fair Value | 324,031.5 |  | 419,540.6
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 8,226.0 |  | 10,653.0
Gross Unrealized Gains | 0.1 |  | 83.5
Gross Unrealized Losses | 59.0 |  | 12.1
Fair Value | 8,167.1 |  | 10,724.4
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 82.2 |  | 114.1
Gross Unrealized Gains | 2.8 |  | 5.9
Gross Unrealized Losses | 0.1 |  | 0.0
Fair Value | 84.9 |  | 120.0
Asset-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 18,966.5 |  | 22,472.2
Gross Unrealized Gains | 62.9 |  | 214.1
Gross Unrealized Losses | 358.7 |  | 353.3
Fair Value | 18,670.7 |  | 22,333.0
Other securities (including mutual fund units) |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 993.2 |  | 1,062.0
Gross Unrealized Gains | 412.8 |  | 641.5
Gross Unrealized Losses | 0.4 |  | 95.5
Fair Value | 1,405.6 |  | 1,608.0
Securities with gross unrealized losses |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 1,174,762.5 |  | 431,324.6
Securities with gross unrealized gains |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | ₨ 1,047,948.5 |  | ₨ 1,680,061.0

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