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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, 2016 INR (₨)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 INR (₨)
Concentration Risk [Line Items]
Total Exposure	₨ 6,027,439.0	$ 90,980.2	₨ 4,766,510.3
Borrower 1
Concentration Risk [Line Items]
Total Exposure	108,364.2	1,635.7	122,795.5
Borrower 1 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	108,184.1		122,505.0
Borrower 1 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	180.1		290.5
Borrower 2
Concentration Risk [Line Items]
Total Exposure	97,344.7	1,469.4	81,088.7
Borrower 2 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	30,964.7		25,516.9
Borrower 2 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	66,380.0		55,571.8
Borrower 3
Concentration Risk [Line Items]
Total Exposure	75,112.6	1,133.8	72,117.2
Borrower 3 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	43,112.6		22,117.2
Borrower 3 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	32,000.0		50,000.0
Borrower 4
Concentration Risk [Line Items]
Total Exposure	65,606.8	990.3	65,016.3
Borrower 4 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	51,398.8		65,000.0
Borrower 4 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	14,208.0		16.3
Borrower 5
Concentration Risk [Line Items]
Total Exposure	65,017.1	981.4	45,708.4
Borrower 5 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	65,000.0		23,919.4
Borrower 5 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	17.1		21,789.0
Borrower 6
Concentration Risk [Line Items]
Total Exposure	50,303.2	759.3	40,613.7
Borrower 6 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	31,714.8		38,545.2
Borrower 6 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	18,588.4		2,068.5
Borrower 7
Concentration Risk [Line Items]
Total Exposure	41,569.8	627.5	35,094.8
Borrower 7 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	7,098.0		496.1
Borrower 7 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	34,471.8		34,598.7
Borrower 8
Concentration Risk [Line Items]
Total Exposure	35,208.3	531.4	35,000.0
Borrower 8 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	5,030.7		35,000.0
Borrower 8 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	30,177.6		0.0
Borrower 9
Concentration Risk [Line Items]
Total Exposure	35,000.0	528.3	30,647.5
Borrower 9 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	35,000.0		15,512.9
Borrower 9 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	0.0		15,134.6
Borrower 10
Concentration Risk [Line Items]
Total Exposure	34,213.9	$ 516.4	30,465.9
Borrower 10 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	33,549.0		15,338.0
Borrower 10 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	₨ 664.9		₨ 15,127.9

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

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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