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Summary of Significant Accounting Policies - Additional Information (Detail) - Segment	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2020
Significant Accounting Policies [Line Items]
Reportable segments	3
Financial statements translation rate, Indian rupees (Rs.) equivalence of U.S. $1	75.87
Retail Loans | Personal Loans, Credit Card Receivables, Auto Loans, Commercial Vehicle and Construction Equipment Finance
Significant Accounting Policies [Line Items]
Loans charge off period		150 days
Retail Loans | Housing loans
Significant Accounting Policies [Line Items]
Loans charge off period		720 days
Retail Loans | Retail Business Banking
Significant Accounting Policies [Line Items]
Loans charge off period		customer by customer basis
Minimum
Significant Accounting Policies [Line Items]
Bank voting rights	20.00%
Minimum | Retail Loans
Significant Accounting Policies [Line Items]
Loans charge off period		150 days
Maximum
Significant Accounting Policies [Line Items]
Bank voting rights	50.00%
Maximum | Retail Loans
Significant Accounting Policies [Line Items]
Loans charge off period		1083 days
HDFC Group [Member] | Minimum
Significant Accounting Policies [Line Items]
Percentage of voting rights in which bank consolidates subsidiary	50.00%

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Loans Charge Off Description

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Significant Accounting Policies [Line Items]

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
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Threshold period for when financing receivable is considered past due to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 14
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447

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- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section S99
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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

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