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Gross Unrealized Losses and Fair Value of Available for Sale Debt Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨)
--- | --- | --- | ---
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | ₨ 756,202.7 | $ 9,967.1 | ₨ 1,162,001.7
Less Than 12 Months Unrealized Losses | 10,558.3 | 139.1 | 23,591.6
12 Months or Greater Fair Value | 1,035,186.3 | 13,644.2 | 98.2
12 Months or Greater Unrealized Losses | 40,285.1 | 531.0 | 1.1
Fair Value | 1,791,389.0 | 23,611.3 | 1,162,099.9
Unrealized Losses | 50,843.4 | $ 670.1 | 23,592.7
Debt securities, other than asset and mortgage-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 730,622.5 |  | 1,112,762.7
Less Than 12 Months Unrealized Losses | 10,246.4 |  | 23,279.9
12 Months or Greater Fair Value | 1,007,543.6 |  | 98.2
12 Months or Greater Unrealized Losses | 40,016.2 |  | 1.1
Fair Value | 1,738,166.1 |  | 1,112,860.9
Unrealized Losses | 50,262.6 |  | 23,281.0
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 | 447,360.3 |  | 930,710.0
Less Than 12 Months Unrealized Losses | 7,893.5 |  | 20,224.7
12 Months or Greater Fair Value | 838,788.4 |  | 98.2
12 Months or Greater Unrealized Losses | 35,052.8 |  | 1.1
Fair Value | 1,286,148.7 |  | 930,808.2
Unrealized Losses | 42,946.3 |  | 20,225.8
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 118,798.2 |  | 43,455.7
Less Than 12 Months Unrealized Losses | 972.4 |  | 373.3
12 Months or Greater Fair Value | 37,138.9 |  | 0.0
12 Months or Greater Unrealized Losses | 311.1 |  | 0.0
Fair Value | 155,937.1 |  | 43,455.7
Unrealized Losses | 1,283.5 |  | 373.3
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 | 15,823.3 |  | 4,957.2
Less Than 12 Months Unrealized Losses | 163.5 |  | 12.3
12 Months or Greater Fair Value | 0.0 |  | 0.0
12 Months or Greater Unrealized Losses | 0.0 |  | 0.0
Fair Value | 15,823.3 |  | 4,957.2
Unrealized Losses | 163.5 |  | 12.3
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 146,365.0 |  | 133,639.8
Less Than 12 Months Unrealized Losses | 1,213.6 |  | 2,669.6
12 Months or Greater Fair Value | 131,616.3 |  | 0.0
12 Months or Greater Unrealized Losses | 4,652.3 |  | 0.0
Fair Value | 277,981.3 |  | 133,639.8
Unrealized Losses | 5,865.9 |  | 2,669.6
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 | 2,275.7 |  | 0.0
Less Than 12 Months Unrealized Losses | 3.4 |  | 0.0
12 Months or Greater Fair Value | 0.0 |  | 0.0
12 Months or Greater Unrealized Losses | 0.0 |  | 0.0
Fair Value | 2,275.7 |  | 0.0
Unrealized Losses | 3.4 |  | 0.0
Mortgage-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 23.0 |  | 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 | 23.0 |  | 0.0
Unrealized Losses | 1.3 |  | 0.0
Asset-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 25,557.2 |  | 49,239.0
Less Than 12 Months Unrealized Losses | 310.6 |  | 311.7
12 Months or Greater Fair Value | 27,642.7 |  | 0.0
12 Months or Greater Unrealized Losses | 268.9 |  | 0.0
Fair Value | 53,199.9 |  | 49,239.0
Unrealized Losses | 579.5 |  | 311.7
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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