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Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨)
--- | --- | --- | ---
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | ₨ 748,590.4 | $ 11,497.3 | ₨ 426,395.0
Less Than 12 Months Unrealized Losses | 10,856.9 | 166.8 | 3,914.6
12 Months or Greater Fair Value | 426,172.1 | 6,545.4 | 4,929.6
12 Months or Greater Unrealized Losses | 8,764.1 | 134.6 | 95.4
Fair Value | 1,174,762.5 | 18,042.7 | 431,324.6
Unrealized Losses | 19,621.0 | $ 301.4 | 4,010.0
Debt securities, other than asset and mortgage-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 740,181.9 |  | 417,114.7
Less Than 12 Months Unrealized Losses | 10,643.3 |  | 3,561.2
12 Months or Greater Fair Value | 420,466.0 |  | 0.0
12 Months or Greater Unrealized Losses | 8,618.5 |  | 0.0
Fair Value | 1,160,647.9 |  | 417,114.7
Unrealized Losses | 19,261.8 |  | 3,561.2
Debt securities, other than asset and mortgage-backed securities | Government of India securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 540,941.5 |  | 234,685.5
Less Than 12 Months Unrealized Losses | 8,852.9 |  | 2,811.3
12 Months or Greater Fair Value | 342,621.5 |  | 0.0
12 Months or Greater Unrealized Losses | 7,991.0 |  | 0.0
Fair Value | 883,563.0 |  | 234,685.5
Unrealized Losses | 16,843.9 |  | 2,811.3
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 159,026.1 |  | 178,908.2
Less Than 12 Months Unrealized Losses | 1,002.8 |  | 737.8
12 Months or Greater Fair Value | 73,734.9 |  | 0.0
12 Months or Greater Unrealized Losses | 620.3 |  | 0.0
Fair Value | 232,761.0 |  | 178,908.2
Unrealized Losses | 1,623.1 |  | 737.8
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 4,057.2 |  | 3,521.0
Less Than 12 Months Unrealized Losses | 51.8 |  | 12.1
12 Months or Greater Fair Value | 4,109.6 |  | 0.0
12 Months or Greater Unrealized Losses | 7.2 |  | 0.0
Fair Value | 8,166.8 |  | 3,521.0
Unrealized Losses | 59.0 |  | 12.1
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 31,940.1 |  |
Less Than 12 Months Unrealized Losses | 729.0 |  |
Fair Value | 31,940.1 |  |
Unrealized Losses | 729.0 |  | 0.0
Debt securities, other than asset and mortgage-backed securities | Government securities outside India |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 4,217.0 |  |
Less Than 12 Months Unrealized Losses | 6.8 |  |
Fair Value | 4,217.0 |  |
Unrealized Losses | 6.8 |  |
Mortgage-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 57.0 |  | 0.0
Less Than 12 Months Unrealized Losses | 0.1 |  | 0.0
12 Months or Greater Fair Value |  |  | 0.0
12 Months or Greater Unrealized Losses |  |  | 0.0
Fair Value | 57.0 |  | 0.0
Unrealized Losses | 0.1 |  | 0.0
Asset-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 8,331.9 |  | 9,149.5
Less Than 12 Months Unrealized Losses | 213.1 |  | 257.9
12 Months or Greater Fair Value | 5,706.1 |  | 4,929.6
12 Months or Greater Unrealized Losses | 145.6 |  | 95.4
Fair Value | 14,038.0 |  | 14,079.1
Unrealized Losses | 358.7 |  | 353.3
Other securities (including mutual fund units) |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 19.6 |  | 130.8
Less Than 12 Months Unrealized Losses | 0.4 |  | 95.5
12 Months or Greater Fair Value |  |  | 0.0
12 Months or Greater Unrealized Losses |  |  | 0.0
Fair Value | 19.6 |  | 130.8
Unrealized Losses | ₨ 0.4 |  | ₨ 95.5

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