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Loans - Additional Information (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2024 INR (₨)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans provided as collateral for borrowings	₨ 2,288,842.6	$ 27,463.9	₨ 1,927,514.2
Purchased financing receivable outstanding	2,600.7		1,024,684.4
Loans receivable restructured due to unexpected event	72,900.0	$ 900.0	86,100.0
Retail Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable restructured due to unexpected event	81,400.0		68,600.0
Wholesale Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable restructured due to unexpected event	₨ 4,700.0		₨ 4,300.0
Current Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due up to which loans	90 days	90 days
Crop related agricultural loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due up to which loans	366 days	366 days

X

- Definition

Amount of increase from purchase of financing receivable including inter-bank participation certificate.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

Accumulated amortized cost of financing receivable modified for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-33

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 310
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
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- Definition

Threshold period for when financing receivable is considered past due, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes threshold period past due to write off as uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-14

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- Definition

Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(5)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
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