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Grading Indicators Related to Bank's Retail Loans and Wholesale Loans (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2017 INR (₨)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	₨ 5,988,909.7	$ 92,350.2	₨ 4,992,834.4
Wholesale loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1,939,948.4	29,914.4	1,534,268.7
Wholesale loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1,893,736.5	29,201.8	1,517,064.5
Wholesale loans | Labeled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	15,936.2	245.7	1,644.5
Wholesale loans | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	30,275.7	466.9	15,559.7
Retail Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	4,048,961.3	62,435.8	3,458,565.7
Retail Loans | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	52,704.0		37,423.0
Retail Loans | Auto loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	720,657.8	11,112.7	589,010.3
Retail Loans | Auto loans | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	6,105.6		4,494.5
Retail Loans | Personal loans/Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	841,806.8	12,980.8	626,152.2
Retail Loans | Personal loans/Credit card | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	6,467.4		4,441.6
Retail Loans | Retail Business Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	913,720.2	14,089.7	791,857.3
Retail Loans | Retail Business Banking | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	21,060.1		15,486.0
Retail Loans | Commercial vehicle and construction equipment finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	460,365.2	7,098.9	369,992.4
Retail Loans | Commercial vehicle and construction equipment finance | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	6,086.6		5,150.7
Retail Loans | Housing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	383,866.9	5,919.3	318,692.0
Retail Loans | Housing loans | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1,678.2		1,068.6
Retail Loans | Other Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	728,544.4	11,234.4	762,861.5
Retail Loans | Other Retail | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	11,306.1		6,781.6
Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	5,905,930.0	$ 91,070.6	4,939,851.7
Performing | Retail Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	3,996,257.3		3,421,142.7
Performing | Retail Loans | Auto loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	714,552.2		584,515.8
Performing | Retail Loans | Personal loans/Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	835,339.4		621,710.6
Performing | Retail Loans | Retail Business Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	892,660.1		776,371.3
Performing | Retail Loans | Commercial vehicle and construction equipment finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	454,278.6		364,841.7
Performing | Retail Loans | Housing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	382,188.7		317,623.4
Performing | Retail Loans | Other Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	₨ 717,238.3		₨ 756,079.9

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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