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Grading Indicators Related to Bank's Retail Loans and Wholesale Loans (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	₨ 7,376,179.0	$ 113,288.0	₨ 5,988,909.7
Wholesale loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	2,162,814.4	33,217.8	1,939,948.4
Wholesale loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	2,116,499.3	32,506.5	1,893,736.5
Wholesale loans | Labeled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	13,502.3	207.4	15,936.2
Wholesale loans | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	32,812.8	503.9	30,275.7
Retail Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	5,213,364.6	80,070.2	4,048,961.3
Retail Loans | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	75,904.5		52,704.0
Retail Loans | Auto loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	885,234.7	13,596.0	720,657.8
Retail Loans | Auto loans | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	8,634.5		6,105.6
Retail Loans | Personal loans/Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1,187,127.1	18,232.6	841,806.8
Retail Loans | Personal loans/Credit card | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	10,150.9		6,467.4
Retail Loans | Retail Business Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1,305,219.8	20,046.4	913,720.2
Retail Loans | Retail Business Banking | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	25,547.2		21,060.1
Retail Loans | Commercial vehicle and construction equipment finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	595,813.6	9,150.9	460,365.2
Retail Loans | Commercial vehicle and construction equipment finance | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	6,968.1		6,086.6
Retail Loans | Housing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	362,718.1	5,570.9	383,866.9
Retail Loans | Housing loans | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1,899.5		1,678.2
Retail Loans | Other Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	877,251.3	13,473.4	728,544.4
Retail Loans | Other Retail | Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	22,704.3		11,306.1
Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	7,267,461.7	$ 111,618.2	5,905,930.0
Performing | Retail Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	5,137,460.1		3,996,257.3
Performing | Retail Loans | Auto loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	876,600.2		714,552.2
Performing | Retail Loans | Personal loans/Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1,176,976.2		835,339.4
Performing | Retail Loans | Retail Business Banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1,279,672.6		892,660.1
Performing | Retail Loans | Commercial vehicle and construction equipment finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	588,845.5		454,278.6
Performing | Retail Loans | Housing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	360,818.6		382,188.7
Performing | Retail Loans | Other Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	₨ 854,547.0		₨ 717,238.3

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section 50
-Paragraph 4
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