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Portfolio of Available for Sale Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | ₨ 2,072,759.4 | $ 31,962.3 | ₨ 1,862,550.9
Gross Unrealized Gains | 42,636.2 | 657.5 | 16,967.7
Gross Unrealized Losses | 4,010.0 | 61.8 | 834.2
Fair Value | 2,111,385.6 | 32,558.0 | 1,878,684.4
Debt securities, other than asset and mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,049,111.1 |  | 1,841,714.5
Gross Unrealized Gains | 41,774.7 |  | 16,314.0
Gross Unrealized Losses | 3,561.2 |  | 403.4
Fair Value | 2,087,324.6 | $ 32,187.0 | 1,857,625.1
Debt securities, other than asset and mortgage-backed securities | Government of India securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,528,484.8 |  | 1,443,404.6
Gross Unrealized Gains | 35,196.3 |  | 12,828.9
Gross Unrealized Losses | 2,811.3 |  | 168.0
Fair Value | 1,560,869.8 |  | 1,456,065.5
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 90,652.8 |  | 92,613.3
Gross Unrealized Gains | 5,537.0 |  | 3,149.3
Gross Unrealized Losses | 0.0 |  | 0.0
Fair Value | 96,189.8 |  | 95,762.6
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 419,320.5 |  | 297,154.7
Gross Unrealized Gains | 957.9 |  | 318.2
Gross Unrealized Losses | 737.8 |  | 231.9
Fair Value | 419,540.6 |  | 297,241.0
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 10,653.0 |  | 8,541.9
Gross Unrealized Gains | 83.5 |  | 17.6
Gross Unrealized Losses | 12.1 |  | 3.5
Fair Value | 10,724.4 |  | 8,556.0
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 114.1 |  | 651.4
Gross Unrealized Gains | 5.9 |  | 17.6
Gross Unrealized Losses | 0.0 |  | 1.3
Fair Value | 120.0 |  | 667.7
Asset-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 22,472.2 |  | 19,417.4
Gross Unrealized Gains | 214.1 |  | 191.9
Gross Unrealized Losses | 353.3 |  | 429.5
Fair Value | 22,333.0 |  | 19,179.8
Other securities (including mutual fund units) |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,062.0 |  | 767.6
Gross Unrealized Gains | 641.5 |  | 444.2
Gross Unrealized Losses | 95.5 |  | 0.0
Fair Value | 1,608.0 |  | 1,211.8
Securities with gross unrealized losses |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 431,324.6 |  | 304,916.5
Securities with gross unrealized gains |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | ₨ 1,680,061.0 |  | ₨ 1,573,767.9

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