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Regulatory Capital Requirements under Banking Regulations- Dividend (Detail) - INR (₨) ₨ / shares in Units, ₨ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Required transfer of after tax Indian GAAP profit to a non-distributable statutory reserve in order to pay dividends without prior RBI approval	25.00%
Net income calculated under Indian GAAP	₨ 174,867.3
Dividends declared	₨ 13.00	₨ 11.00	₨ 9.50
Indian GAAP
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividend payout, description of restrictions	As per the RBI guidelines, the dividend payout (excluding dividend tax) for March 31, 2018 cannot exceed 35% of net income of Rs. 174,867.3 million as calculated under Indian GAAP.
Indian GAAP | Maximum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividend payout, maximum pay out as a percentage of net income calculated under Indian GAAP	35.00%

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The profit or loss for the period under Indian GAAP, net of income taxes.

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Percentage of after tax Indian GAAP profit required transfer to a non-distributable statutory reserve for payment of dividends without prior RBI approval.

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Maximum amount of Dividend payout as a percentage of net income under Indian GAAP.

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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

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

Disclosure of statutory restrictions on the payment of dividends as prescribed by the National Association of Insurance Commissioners or state regulatory authorities, amounts not available for future dividend payments, and amount of dividends paid.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

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