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Portfolio of Available for Sale Debt Securities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019 INR (₨)		Mar. 31, 2019 USD ($)	Mar. 31, 2018 INR (₨)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	₨ 2,617,505.3		$ 37,847.2	₨ 2,228,983.3
Gross Unrealized Gains	27,846.4		402.6	12,080.6
Gross Unrealized Losses	12,003.3		173.6	19,620.6
Fair Value	2,633,348.4		38,076.2	2,221,443.3
Debt securities, other than asset and mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,577,245.6			2,209,797.0
Gross Unrealized Gains	27,680.1			12,014.6
Gross Unrealized Losses	11,880.7			19,261.8
Fair Value	2,593,045.0		$ 37,493.4	2,202,549.8
Debt securities, other than asset and mortgage-backed securities | Government of India securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,147,934.6			1,748,761.0
Gross Unrealized Gains	21,881.4			9,169.5
Gross Unrealized Losses	9,834.9			16,843.9
Fair Value	2,159,981.1			1,741,086.6
Debt securities, other than asset and mortgage-backed securities | State government securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	144,633.7			123,426.9
Gross Unrealized Gains	4,864.6			2,349.7
Gross Unrealized Losses	475.7			729.0
Fair Value	149,022.6			125,047.6
Debt securities, other than asset and mortgage-backed securities | Government securities outside India
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,201.6			4,223.8
Gross Unrealized Gains	3.3			0.0
Gross Unrealized Losses	0.0			6.8
Fair Value	7,204.9			4,217.0
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	273,550.7			325,159.3
Gross Unrealized Gains	899.9			495.3
Gross Unrealized Losses	1,563.8			1,623.1
Fair Value	272,886.8			324,031.5
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,925.0			8,226.0
Gross Unrealized Gains	30.9			0.1
Gross Unrealized Losses	6.3			59.0
Fair Value	3,949.6			8,167.1
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	56.3			82.2
Gross Unrealized Gains	1.0			2.8
Gross Unrealized Losses	0.4			0.1
Fair Value	56.9			84.9
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,827.1			18,966.5
Gross Unrealized Gains	165.0			62.9
Gross Unrealized Losses	122.2			358.7
Fair Value	38,869.9			18,670.7
Other securities (including mutual fund units)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,376.3	[1]		137.6
Gross Unrealized Gains	0.3	[1]		0.3
Gross Unrealized Losses	0.0	[1]		0.0
Fair Value	1,376.6	[1]		137.9
Securities with gross unrealized losses
Schedule of Available-for-sale Securities [Line Items]
Fair Value	799,718.5			1,174,742.9
Securities with gross unrealized gains
Schedule of Available-for-sale Securities [Line Items]
Fair Value	₨ 1,833,629.9			₨ 1,046,700.4
[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. See note 2 (w)(ii) and note 14 to the Consolidated Financial Statements for additional details.

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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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