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Gross Unrealized Losses and Fair Value of Available for Sale Debt Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨)
--- | --- | --- | ---
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | ₨ 32,187.5 | $ 465.4 | ₨ 748,570.8
Less Than 12 Months Unrealized Losses | 137.0 | 2.0 | 10,856.5
12 Months or Greater Fair Value | 767,531.0 | 11,097.9 | 426,172.1
12 Months or Greater Unrealized Losses | 11,866.3 | 171.6 | 8,764.1
Fair Value | 799,718.5 | 11,563.3 | 1,174,742.9
Unrealized Losses | 12,003.3 | $ 173.6 | 19,620.6
Debt securities, other than asset and mortgage-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 17,996.3 |  | 740,181.9
Less Than 12 Months Unrealized Losses | 88.1 |  | 10,643.3
12 Months or Greater Fair Value | 763,992.6 |  | 420,466.0
12 Months or Greater Unrealized Losses | 11,792.6 |  | 8,618.5
Fair Value | 781,988.9 |  | 1,160,647.9
Unrealized Losses | 11,880.7 |  | 19,261.8
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 | 0.0 |  | 540,941.5
Less Than 12 Months Unrealized Losses | 0.0 |  | 8,852.9
12 Months or Greater Fair Value | 568,759.0 |  | 342,621.5
12 Months or Greater Unrealized Losses | 9,834.9 |  | 7,991.0
Fair Value | 568,759.0 |  | 883,563.0
Unrealized Losses | 9,834.9 |  | 16,843.9
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 17,996.3 |  | 159,026.1
Less Than 12 Months Unrealized Losses | 88.1 |  | 1,002.8
12 Months or Greater Fair Value | 165,700.5 |  | 73,734.9
12 Months or Greater Unrealized Losses | 1,475.7 |  | 620.3
Fair Value | 183,696.8 |  | 232,761.0
Unrealized Losses | 1,563.8 |  | 1,623.1
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 | 0.0 |  | 4,057.2
Less Than 12 Months Unrealized Losses | 0.0 |  | 51.8
12 Months or Greater Fair Value | 2,117.6 |  | 4,109.6
12 Months or Greater Unrealized Losses | 6.3 |  | 7.2
Fair Value | 2,117.6 |  | 8,166.8
Unrealized Losses | 6.3 |  | 59.0
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 0.0 |  | 31,940.1
Less Than 12 Months Unrealized Losses | 0.0 |  | 729.0
12 Months or Greater Fair Value | 27,415.5 |  | 0.0
12 Months or Greater Unrealized Losses | 475.7 |  | 0.0
Fair Value | 27,415.5 |  | 31,940.1
Unrealized Losses | 475.7 |  | 729.0
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 | 0.0 |  | 4,217.0
Less Than 12 Months Unrealized Losses | 0.0 |  | 6.8
12 Months or Greater Fair Value | 0.0 |  | 0.0
12 Months or Greater Unrealized Losses | 0.0 |  | 0.0
Fair Value | 0.0 |  | 4,217.0
Unrealized Losses | 0.0 |  | 6.8
Mortgage-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 0.0 |  | 57.0
Less Than 12 Months Unrealized Losses | 0.0 |  | 0.1
12 Months or Greater Fair Value | 45.7 |  | 0.0
12 Months or Greater Unrealized Losses | 0.4 |  | 0.0
Fair Value | 45.7 |  | 57.0
Unrealized Losses | 0.4 |  | 0.1
Asset-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 14,191.2 |  | 8,331.9
Less Than 12 Months Unrealized Losses | 48.9 |  | 213.1
12 Months or Greater Fair Value | 3,492.7 |  | 5,706.1
12 Months or Greater Unrealized Losses | 73.3 |  | 145.6
Fair Value | 17,683.9 |  | 14,038.0
Unrealized Losses | 122.2 |  | 358.7
Other securities (including mutual fund units) |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 0.0 |  | 0.0
Less Than 12 Months Unrealized Losses | 0.0 |  | 0.0
12 Months or Greater Fair Value | 0.0 |  | 0.0
12 Months or Greater Unrealized Losses | 0.0 |  | 0.0
Fair Value | 0.0 |  | 0.0
Unrealized Losses | ₨ 0.0 |  | ₨ 0.0

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