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Gross Unrealized Losses and Fair Value of Available for Sale Debt Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨)
--- | --- | --- | ---
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | ₨ 1,162,001.7 | $ 15,887.4 | ₨ 122,669.6
Less Than 12 Months Unrealized Losses | 23,591.6 | 322.6 | 1,105.3
12 Months or Greater Fair Value | 98.2 | 1.3 | 178,262.5
12 Months or Greater Unrealized Losses | 1.1 | 0.0 | 1,623.2
Fair Value | 1,162,099.9 | 15,888.7 | 300,932.1
Unrealized Losses | 23,592.7 | $ 322.6 | 2,728.5
Debt securities, other than asset and mortgage-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 1,112,762.7 |  | 81,158.9
Less Than 12 Months Unrealized Losses | 23,279.9 |  | 960.6
12 Months or Greater Fair Value | 98.2 |  | 177,416.2
12 Months or Greater Unrealized Losses | 1.1 |  | 1,617.9
Fair Value | 1,112,860.9 |  | 258,575.1
Unrealized Losses | 23,281.0 |  | 2,578.5
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 | 930,710.0 |  | 24,492.8
Less Than 12 Months Unrealized Losses | 20,224.7 |  | 69.8
12 Months or Greater Fair Value | 98.2 |  | 158,735.8
12 Months or Greater Unrealized Losses | 1.1 |  | 1,421.8
Fair Value | 930,808.2 |  | 183,228.6
Unrealized Losses | 20,225.8 |  | 1,491.6
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 43,455.7 |  | 38,039.9
Less Than 12 Months Unrealized Losses | 373.3 |  | 481.2
12 Months or Greater Fair Value | 0.0 |  | 18,680.4
12 Months or Greater Unrealized Losses | 0.0 |  | 196.1
Fair Value | 43,455.7 |  | 56,720.3
Unrealized Losses | 373.3 |  | 677.3
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 | 4,957.2 |  | 18,626.2
Less Than 12 Months Unrealized Losses | 12.3 |  | 409.6
12 Months or Greater Fair Value | 0.0 |  | 0.0
12 Months or Greater Unrealized Losses | 0.0 |  | 0.0
Fair Value | 4,957.2 |  | 18,626.2
Unrealized Losses | 12.3 |  | 409.6
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 133,639.8 |  | 0.0
Less Than 12 Months Unrealized Losses | 2,669.6 |  | 0.0
12 Months or Greater Fair Value | 0.0 |  | 0.0
12 Months or Greater Unrealized Losses | 0.0 |  | 0.0
Fair Value | 133,639.8 |  | 0.0
Unrealized Losses | 2,669.6 |  | 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 | 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
Mortgage-backed securities |  |  |
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
Asset-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 49,239.0 |  | 41,510.7
Less Than 12 Months Unrealized Losses | 311.7 |  | 144.7
12 Months or Greater Fair Value | 0.0 |  | 846.3
12 Months or Greater Unrealized Losses | 0.0 |  | 5.3
Fair Value | 49,239.0 |  | 42,357.0
Unrealized Losses | 311.7 |  | 150.0
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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