Business Combination - Details of PCD of EHDFC (Detail) - Jul. 01, 2023 - eHDFC [Member] ₨ in Millions, $ in Millions	INR (₨)	USD ($)
Disclosure Of Financing Receivable Purchased With Credit Deterioration [Line Items]
Par value of PCD loans at acquisition	₨ 116,646.3	$ 1,365.4
Allowance for credit losses on PCD loans at acquisition	39,415.2	461.4
Fair value of receivables at acquisition	77,200.4	903.7
Non-credit discount/(premium) on PCD loans at acquisition	30.7	$ 0.4
Wholesale
Disclosure Of Financing Receivable Purchased With Credit Deterioration [Line Items]
Par value of PCD loans at acquisition	72,684.7
Allowance for credit losses on PCD loans at acquisition	36,487.3
Fair value of receivables at acquisition	36,197.4
Non-credit discount/(premium) on PCD loans at acquisition	0.0
Retail
Disclosure Of Financing Receivable Purchased With Credit Deterioration [Line Items]
Par value of PCD loans at acquisition	43,961.6
Allowance for credit losses on PCD loans at acquisition	2,927.9
Fair value of receivables at acquisition	41,003.0
Non-credit discount/(premium) on PCD loans at acquisition	₨ 30.7

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Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-19

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Amount at par value of financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-19

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Amount at purchase price of financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-19

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- Definition

Amount of discount (premium) attributable to other factors on financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-19

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