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Gross Unrealized Losses and Fair Value of Available for Sale Debt Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨)
--- | --- | --- | ---
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | ₨ 122,669.6 | $ 1,627.1 | ₨ 32,187.5
Less Than 12 Months Unrealized Losses | 1,105.3 | 14.7 | 137.0
12 Months or Greater Fair Value | 178,262.5 | 2,364.5 | 767,531.0
12 Months or Greater Unrealized Losses | 1,623.2 | 21.5 | 11,866.3
Fair Value | 300,932.1 | 3,991.6 | 799,718.5
Unrealized Losses | 2,728.5 | $ 36.2 | 12,003.3
Debt securities, other than asset and mortgage-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 81,158.9 |  | 17,996.3
Less Than 12 Months Unrealized Losses | 960.6 |  | 88.1
12 Months or Greater Fair Value | 177,416.2 |  | 763,992.6
12 Months or Greater Unrealized Losses | 1,617.9 |  | 11,792.6
Fair Value | 258,575.1 |  | 781,988.9
Unrealized Losses | 2,578.5 |  | 11,880.7
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 | 24,492.8 |  | 0.0
Less Than 12 Months Unrealized Losses | 69.8 |  | 0.0
12 Months or Greater Fair Value | 158,735.8 |  | 568,759.0
12 Months or Greater Unrealized Losses | 1,421.8 |  | 9,834.9
Fair Value | 183,228.6 |  | 568,759.0
Unrealized Losses | 1,491.6 |  | 9,834.9
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 38,039.9 |  | 17,996.3
Less Than 12 Months Unrealized Losses | 481.2 |  | 88.1
12 Months or Greater Fair Value | 18,680.4 |  | 165,700.5
12 Months or Greater Unrealized Losses | 196.1 |  | 1,475.7
Fair Value | 56,720.3 |  | 183,696.8
Unrealized Losses | 677.3 |  | 1,563.8
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 | 18,626.2 |  | 0.0
Less Than 12 Months Unrealized Losses | 409.6 |  | 0.0
12 Months or Greater Fair Value | 0.0 |  | 2,117.6
12 Months or Greater Unrealized Losses | 0.0 |  | 6.3
Fair Value | 18,626.2 |  | 2,117.6
Unrealized Losses | 409.6 |  | 6.3
Debt securities, other than asset and mortgage-backed securities | State government securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 0.0 |  | 0.0
Less Than 12 Months Unrealized Losses | 0.0 |  | 0.0
12 Months or Greater Fair Value | 0.0 |  | 27,415.5
12 Months or Greater Unrealized Losses | 0.0 |  | 475.7
Fair Value | 0.0 |  | 27,415.5
Unrealized Losses | 0.0 |  | 475.7
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 |  | 45.7
12 Months or Greater Unrealized Losses | 0.0 |  | 0.4
Fair Value | 0.0 |  | 45.7
Unrealized Losses | 0.0 |  | 0.4
Asset-backed securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Less Than 12 Months Fair Value | 41,510.7 |  | 14,191.2
Less Than 12 Months Unrealized Losses | 144.7 |  | 48.9
12 Months or Greater Fair Value | 846.3 |  | 3,492.7
12 Months or Greater Unrealized Losses | 5.3 |  | 73.3
Fair Value | 42,357.0 |  | 17,683.9
Unrealized Losses | 150.0 |  | 122.2
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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