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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Mar. 31, 2025 Segment
Significant Accounting Policies [Line Items] |
Reportable segments | 5
Financial statements translation rate, Indian rupees (Rs.) equivalence of U.S. $1 | 85.43
HDFC Group [Member] | Minimum |
Significant Accounting Policies [Line Items] |
Percentage of voting rights in which bank consolidates subsidiary | 50.00%
HDFC Group [Member] | Minimum | HDFC Bank Limited |
Significant Accounting Policies [Line Items] |
Bank voting rights | 20.00%
HDFC Group [Member] | Maximum | HDFC Bank Limited |
Significant Accounting Policies [Line Items] |
Bank voting rights | 50.00%

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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://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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