Portfolio of AFS Debt Securities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2023 INR (₨)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 INR (₨)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	₨ 4,979,205.7	$ 60,581.7	₨ 4,416,934.2
Gross Unrealized Gains	6,552.9	79.7	22,472.3
Gross Unrealized Losses	106,914.6	1,300.8	50,843.4
Fair Value	4,878,844.0	59,360.6	4,388,563.1
Debt securities, other than asset and mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,828,914.5		4,273,955.4
Gross Unrealized Gains	6,497.7		20,952.7
Gross Unrealized Losses	105,021.4		50,262.6
Fair Value	4,730,390.8	$ 57,554.3	4,244,645.5
Debt securities, other than asset and mortgage-backed securities \| Government of India securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,860,431.8		3,226,917.6
Gross Unrealized Gains	4,656.4		10,995.6
Gross Unrealized Losses	80,344.5		42,946.3
Fair Value	3,784,743.7		3,194,966.9
Debt securities, other than asset and mortgage-backed securities \| State government securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	428,980.9		429,146.8
Gross Unrealized Gains	1,322.5		4,395.9
Gross Unrealized Losses	15,604.8		5,865.9
Fair Value	414,698.6		427,676.8
Debt securities, other than asset and mortgage-backed securities \| Government securities outside India
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	819.0		2,279.2
Gross Unrealized Gains	0.0		0.0
Gross Unrealized Losses	21.8		3.4
Fair Value	797.2		2,275.8
Debt securities, other than asset and mortgage-backed securities \| Credit Substitutes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	511,161.4		578,922.3
Gross Unrealized Gains	505.4		5,381.4
Gross Unrealized Losses	8,479.0		1,283.5
Fair Value	503,187.8		583,020.2
Debt securities, other than asset and mortgage-backed securities \| Other corporate/financial institution bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	27,521.4		36,689.5
Gross Unrealized Gains	13.4		179.8
Gross Unrealized Losses	571.3		163.5
Fair Value	26,963.5		36,705.8
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	19.3		24.2
Gross Unrealized Gains	0.0		0.0
Gross Unrealized Losses	1.8		1.3
Fair Value	17.5		22.9
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	150,271.9		142,954.6
Gross Unrealized Gains	55.2		1,519.6
Gross Unrealized Losses	1,891.4		579.5
Fair Value	148,435.7		143,894.7
Securities with gross unrealized losses
Schedule of Available-for-sale Securities [Line Items]
Fair Value	3,220,573.8		1,791,389.0
Securities with gross unrealized gains
Schedule of Available-for-sale Securities [Line Items]
Fair Value	₨ 1,658,270.2		₨ 2,597,174.1

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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