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Allowance for Credit Losses (Parenthetical) (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2021 INR (₨)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 INR (₨)	Mar. 31, 2019 INR (₨)
Financing Receivable, Allowance for Credit Loss [Line Items]
Cash recoveries, recoveries against write off cases	₨ 28,919.8	$ 395.4	₨ 25,658.9	₨ 16,777.1
Retail Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Recoveries of loans	28,605.8		22,548.7	16,590.9
Wholesale loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Recoveries of loans	₨ 314.0		₨ 3,110.2	₨ 186.2

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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X

- Definition

Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448

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- Definition

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+ References

No definition available.

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