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Portfolio of Available for Sale Debt Securities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2020 INR (₨)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 INR (₨)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	₨ 3,340,732.3	$ 44,312.6	₨ 2,617,505.3
Gross Unrealized Gains	68,285.4	905.8	27,846.4
Gross Unrealized Losses	2,728.5	36.2	12,003.3
Fair Value	3,406,289.2	45,182.2	2,633,348.4
Debt securities, other than asset and mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,213,339.7		2,577,245.6
Gross Unrealized Gains	66,538.4		27,680.1
Gross Unrealized Losses	2,578.5		11,880.7
Fair Value	3,277,299.6	$ 43,471.3	2,593,045.0
Debt securities, other than asset and mortgage-backed securities | Government of India securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,637,464.4		2,147,934.6
Gross Unrealized Gains	52,630.0		21,881.4
Gross Unrealized Losses	1,491.6		9,834.9
Fair Value	2,688,602.8		2,159,981.1
Debt securities, other than asset and mortgage-backed securities | State government securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	177,055.9		144,633.7
Gross Unrealized Gains	11,337.7		4,864.6
Gross Unrealized Losses	0.0		475.7
Fair Value	188,393.6		149,022.6
Debt securities, other than asset and mortgage-backed securities | Government securities outside India
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,367.0		7,201.6
Gross Unrealized Gains	48.4		3.3
Gross Unrealized Losses	0.0		0.0
Fair Value	8,415.4		7,204.9
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	360,741.5		273,550.7
Gross Unrealized Gains	2,309.5		899.9
Gross Unrealized Losses	677.3		1,563.8
Fair Value	362,373.7		272,886.8
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	29,710.9		3,925.0
Gross Unrealized Gains	212.8		30.9
Gross Unrealized Losses	409.6		6.3
Fair Value	29,514.1		3,949.6
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	37.3		56.3
Gross Unrealized Gains	0.8		1.0
Gross Unrealized Losses	0.0		0.4
Fair Value	38.1		56.9
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	125,931.2		38,827.1
Gross Unrealized Gains	1,746.0		165.0
Gross Unrealized Losses	150.0		122.2
Fair Value	127,527.2		38,869.9
Other securities (including mutual fund units)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,424.1		1,376.3	[1]
Gross Unrealized Gains	0.2		0.3	[1]
Gross Unrealized Losses	0.0		0.0	[1]
Fair Value	1,424.3		1,376.6	[1]
Securities with gross unrealized losses
Schedule of Available-for-sale Securities [Line Items]
Fair Value	300,932.1		799,718.5
Securities with gross unrealized gains
Schedule of Available-for-sale Securities [Line Items]
Fair Value	₨ 3,105,357.1		₨ 1,833,629.9
[1] The Bank adopted ASU 2016-01 and ASU 2018-03 as of April 1, 2018, resulting in a cumulative effect adjustment from AOCI to retained earnings for net unrealized gains on marketable equity securities AFS. The available-for sale category was eliminated for equity securities amortized cost Rs. 855.6 million and carrying value Rs. 1,267.7 million effective April 1, 2018.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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