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Exposures to Ten Largest Borrowers Computed as per RBI Guidelines, Based on Higher of Outstanding Balance or Limit on Loans, Investments (Including Credit Substitutes) and Non-Funded Exposures (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2015 INR (₨)	Mar. 31, 2015 USD ($)	Mar. 31, 2014 INR (₨)
Concentration Risk [Line Items]
Total Exposure	₨ 4,766,510.3	$ 76,496.9	₨ 3,877,447.0
Borrower 1
Concentration Risk [Line Items]
Total Exposure	122,795.5	1,970.7	121,954.2
Borrower 1 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	122,505.0		121,804.1
Borrower 1 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	290.5		150.1
Borrower 2
Concentration Risk [Line Items]
Total Exposure	81,088.7	1,301.4	75,240.2
Borrower 2 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	25,516.9		39,740.2
Borrower 2 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	55,571.8		35,500.0
Borrower 3
Concentration Risk [Line Items]
Total Exposure	72,117.2	1,157.4	65,071.3
Borrower 3 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	22,117.2		42,582.3
Borrower 3 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	50,000.0		22,489.0
Borrower 4
Concentration Risk [Line Items]
Total Exposure	65,016.3	1,043.4	42,516.5
Borrower 4 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	65,000.0		26,948.1
Borrower 4 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	16.3		15,568.4
Borrower 5
Concentration Risk [Line Items]
Total Exposure	45,708.4	733.6	42,500.0
Borrower 5 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	23,919.4		42,500.0
Borrower 5 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	21,789.0		0.0
Borrower 6
Concentration Risk [Line Items]
Total Exposure	40,613.7	651.8	36,074.0
Borrower 6 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	38,545.2		12,469.1
Borrower 6 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	2,068.5		23,604.9
Borrower 7
Concentration Risk [Line Items]
Total Exposure	35,094.8	563.2	30,000.0
Borrower 7 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	496.1		30,000.0
Borrower 7 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	34,598.7		0.0
Borrower 8
Concentration Risk [Line Items]
Total Exposure	35,000.0	561.7	29,639.2
Borrower 8 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	35,000.0		27,400.0
Borrower 8 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	0.0		2,239.2
Borrower 9
Concentration Risk [Line Items]
Total Exposure	30,647.5	491.9	26,984.1
Borrower 9 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	15,512.9		26,980.8
Borrower 9 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	15,134.6		3.3
Borrower 10
Concentration Risk [Line Items]
Total Exposure	30,465.9	$ 488.9	26,764.8
Borrower 10 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	15,338.0		18,797.6
Borrower 10 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	₨ 15,127.9		₨ 7,967.2

X

- Definition

Maximum amount of exposure due to credit risk that, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

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- Definition

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