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Portfolio of AFS Debt Securities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2024 INR (₨)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 INR (₨)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	₨ 8,306,160.5	$ 99,666.0	₨ 4,979,205.7
Gross Unrealized Gains	65,491.0	785.8	6,552.9
Gross Unrealized Losses	76,164.4	913.9	106,914.6
Fair Value	8,295,487.1	99,537.9	4,878,844.0
Debt securities, other than asset and mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,167,306.7		4,828,914.5
Gross Unrealized Gains	65,153.1		6,497.7
Gross Unrealized Losses	75,520.9		105,021.4
Fair Value	8,156,938.9	$ 97,875.5	4,730,390.8
Debt securities, other than asset and mortgage-backed securities | Government of India securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,105,313.9		3,860,431.8
Gross Unrealized Gains	41,090.5		4,656.4
Gross Unrealized Losses	52,213.3		80,344.5
Fair Value	6,094,191.1		3,784,743.7
Debt securities, other than asset and mortgage-backed securities | State government securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,188,315.0		428,980.9
Gross Unrealized Gains	7,600.4		1,322.5
Gross Unrealized Losses	12,234.4		15,604.8
Fair Value	1,183,681.0		414,698.6
Debt securities, other than asset and mortgage-backed securities | Government securities outside India
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,556.3		819.0
Gross Unrealized Gains	3.9		0.0
Gross Unrealized Losses	18.4		21.8
Fair Value	3,541.8		797.2
Debt securities, other than asset and mortgage-backed securities | Credit substitutes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	133,197.8		511,161.4
Gross Unrealized Gains	321.7		505.4
Gross Unrealized Losses	2,032.6		8,479.0
Fair Value	131,486.9		503,187.8
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	736,923.7		27,521.4
Gross Unrealized Gains	16,136.6		13.4
Gross Unrealized Losses	9,022.2		571.3
Fair Value	744,038.1		26,963.5
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	78.1		19.3
Gross Unrealized Gains	2.3		0.0
Gross Unrealized Losses	1.2		1.8
Fair Value	79.2		17.5
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	138,775.7		150,271.9
Gross Unrealized Gains	335.6		55.2
Gross Unrealized Losses	642.3		1,891.4
Fair Value	138,469.0		148,435.7
Securities with gross unrealized losses
Schedule of Available-for-sale Securities [Line Items]
Fair Value	3,706,475.3		3,220,573.8
Securities with gross unrealized gains
Schedule of Available-for-sale Securities [Line Items]
Fair Value	₨ 4,589,011.8		₨ 1,658,270.2

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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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