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Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨)
--- | --- | --- | ---
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | ₨ 426,395.0 | $ 6,575.1 | ₨ 274,195.9
Less Than 12 Months Unrealized Losses | 3,914.6 | 60.3 | 680.9
12 Months or Greater Fair Value | 4,929.6 | 76.0 | 30,720.6
12 Months or Greater Unrealized Losses | 95.4 | 1.5 | 153.3
Fair Value | 431,324.6 | 6,651.1 | 304,916.5
Unrealized Losses | 4,010.0 | $ 61.8 | 834.2
Debt securities, other than asset and mortgage-backed securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | 417,114.7 |  | 255,634.8
Less Than 12 Months Unrealized Losses | 3,561.2 |  | 250.1
12 Months or Greater Fair Value | 0.0 |  | 30,720.6
12 Months or Greater Unrealized Losses | 0.0 |  | 153.3
Fair Value | 417,114.7 |  | 286,355.4
Unrealized Losses | 3,561.2 |  | 403.4
Debt securities, other than asset and mortgage-backed securities | Government of India securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | 234,685.5 |  | 40,363.1
Less Than 12 Months Unrealized Losses | 2,811.3 |  | 16.1
12 Months or Greater Fair Value | 0.0 |  | 27,683.1
12 Months or Greater Unrealized Losses | 0.0 |  | 151.9
Fair Value | 234,685.5 |  | 68,046.2
Unrealized Losses | 2,811.3 |  | 168.0
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | 178,908.2 |  | 213,878.3
Less Than 12 Months Unrealized Losses | 737.8 |  | 231.4
12 Months or Greater Fair Value | 0.0 |  | 749.6
12 Months or Greater Unrealized Losses | 0.0 |  | 0.5
Fair Value | 178,908.2 |  | 214,627.9
Unrealized Losses | 737.8 |  | 231.9
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | 3,521.0 |  | 1,393.4
Less Than 12 Months Unrealized Losses | 12.1 |  | 2.6
12 Months or Greater Fair Value | 0.0 |  | 2,287.9
12 Months or Greater Unrealized Losses | 0.0 |  | 0.9
Fair Value | 3,521.0 |  | 3,681.3
Unrealized Losses | 12.1 |  | 3.5
Mortgage-backed securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | 0.0 |  | 87.6
Less Than 12 Months Unrealized Losses | 0.0 |  | 1.3
12 Months or Greater Fair Value | 0.0 |  | 0.0
12 Months or Greater Unrealized Losses | 0.0 |  | 0.0
Fair Value | 0.0 |  | 87.6
Unrealized Losses | 0.0 |  | 1.3
Asset-backed securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | 9,149.5 |  | 18,473.5
Less Than 12 Months Unrealized Losses | 257.9 |  | 429.5
12 Months or Greater Fair Value | 4,929.6 |  | 0.0
12 Months or Greater Unrealized Losses | 95.4 |  | 0.0
Fair Value | 14,079.1 |  | 18,473.5
Unrealized Losses | 353.3 |  | 429.5
Other securities (including mutual fund units) |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | 130.8 |  |
Less Than 12 Months Unrealized Losses | 95.5 |  |
12 Months or Greater Fair Value | 0.0 |  |
12 Months or Greater Unrealized Losses | 0.0 |  |
Fair Value | 130.8 |  |
Unrealized Losses | ₨ 95.5 |  | ₨ 0.0

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