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Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2016 INR (₨) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 INR (₨)
--- | --- | --- | ---
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | ₨ 274,195.9 | $ 4,138.8 | ₨ 191,531.4
Less Than 12 Months Unrealized Losses | 680.9 | 10.3 | 669.3
12 Months or Greater Fair Value | 30,720.6 | 463.7 | 277,472.6
12 Months or Greater Unrealized Losses | 153.3 | 2.3 | 1,204.8
Fair Value | 304,916.5 | 4,602.5 | 469,004.0
Unrealized Losses | 834.2 | $ 12.6 | 1,874.1
Debt securities, other than asset and mortgage-backed securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | 255,634.8 |  | 170,801.4
Less Than 12 Months Unrealized Losses | 250.1 |  | 216.8
12 Months or Greater Fair Value | 30,720.6 |  | 277,472.6
12 Months or Greater Unrealized Losses | 153.3 |  | 1,204.8
Fair Value | 286,355.4 |  | 448,274.0
Unrealized Losses | 403.4 |  | 1,421.6
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 | 40,363.1 |  | 10,602.4
Less Than 12 Months Unrealized Losses | 16.1 |  | 37.9
12 Months or Greater Fair Value | 27,683.1 |  | 277,465.1
12 Months or Greater Unrealized Losses | 151.9 |  | 1,204.8
Fair Value | 68,046.2 |  | 288,067.5
Unrealized Losses | 168.0 |  | 1,242.7
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value |  |  | 0.0
Less Than 12 Months Unrealized Losses |  |  | 0.0
12 Months or Greater Fair Value |  |  | 7.5
12 Months or Greater Unrealized Losses |  |  | 0.0
Fair Value |  |  | 7.5
Unrealized Losses | 0.0 |  | 0.0
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | 213,878.3 |  | 158,859.4
Less Than 12 Months Unrealized Losses | 231.4 |  | 177.4
12 Months or Greater Fair Value | 749.6 |  | 0.0
12 Months or Greater Unrealized Losses | 0.5 |  | 0.0
Fair Value | 214,627.9 |  | 158,859.4
Unrealized Losses | 231.9 |  | 177.4
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 | 1,393.4 |  | 1,339.6
Less Than 12 Months Unrealized Losses | 2.6 |  | 1.5
12 Months or Greater Fair Value | 2,287.9 |  | 0.0
12 Months or Greater Unrealized Losses | 0.9 |  | 0.0
Fair Value | 3,681.3 |  | 1,339.6
Unrealized Losses | 3.5 |  | 1.5
Mortgage-backed securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | 87.6 |  | 0.0
Less Than 12 Months Unrealized Losses | 1.3 |  | 0.0
12 Months or Greater Fair Value | 0.0 |  | 0.0
12 Months or Greater Unrealized Losses | 0.0 |  | 0.0
Fair Value | 87.6 |  | 0.0
Unrealized Losses | 1.3 |  | 0.0
Asset-backed securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value | 18,473.5 |  | 20,727.1
Less Than 12 Months Unrealized Losses | 429.5 |  | 452.2
12 Months or Greater Fair Value | 0.0 |  | 0.0
12 Months or Greater Unrealized Losses | 0.0 |  | 0.0
Fair Value | 18,473.5 |  | 20,727.1
Unrealized Losses | ₨ 429.5 |  | 452.2
Other securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Less Than 12 Months Fair Value |  |  | 2.9
Less Than 12 Months Unrealized Losses |  |  | 0.3
12 Months or Greater Fair Value |  |  | 0.0
12 Months or Greater Unrealized Losses |  |  | 0.0
Fair Value |  |  | 2.9
Unrealized Losses |  |  | ₨ 0.3

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