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Summary Information Relating to Non-performing Loans (Detail) Loans (Detail) - Gross Loans ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2021 INR (₨)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 INR (₨)	Mar. 31, 2019 INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average non-performing loans, net of allowance	₨ 73,435.6	$ 1,004.0	₨ 55,232.3	₨ 50,378.2
Interest income recognized on non-performing loans	₨ 7,025.3	$ 96.1	₨ 10,160.5	₨ 6,994.7

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Financing receivable, nonaccrual Average balance, net of allowance.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447

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