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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, 2017 INR (₨)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 INR (₨)
Concentration Risk [Line Items]
Total Exposure	₨ 7,276,675.4	$ 112,207.8	₨ 6,027,439.0
Borrower 1
Concentration Risk [Line Items]
Total Exposure	106,885.0	1,648.2	108,364.2
Borrower 1 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	19,561.0		108,184.1
Borrower 1 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	87,324.0		180.1
Borrower 2
Concentration Risk [Line Items]
Total Exposure	73,443.3	1,132.5	97,344.7
Borrower 2 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	54,388.2		30,964.7
Borrower 2 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	19,055.1		66,380.0
Borrower 3
Concentration Risk [Line Items]
Total Exposure	65,040.1	1,002.9	75,112.6
Borrower 3 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	65,000.0		43,112.6
Borrower 3 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	40.1		32,000.0
Borrower 4
Concentration Risk [Line Items]
Total Exposure	62,119.8	957.9	65,606.8
Borrower 4 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	33,472.8		51,398.8
Borrower 4 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	28,647.0		14,208.0
Borrower 5
Concentration Risk [Line Items]
Total Exposure	58,598.7	903.6	65,017.1
Borrower 5 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	45,790.0		65,000.0
Borrower 5 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	12,808.7		17.1
Borrower 6
Concentration Risk [Line Items]
Total Exposure	50,000.0	771.0	50,303.2
Borrower 6 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	50,000.0		31,714.8
Borrower 6 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	0.0		18,588.4
Borrower 7
Concentration Risk [Line Items]
Total Exposure	40,000.0	616.8	41,569.8
Borrower 7 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	40,000.0		7,098.0
Borrower 7 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	0.0		34,471.8
Borrower 8
Concentration Risk [Line Items]
Total Exposure	39,998.0	616.8	35,208.3
Borrower 8 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	19,071.8		5,030.7
Borrower 8 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	20,926.2		30,177.6
Borrower 9
Concentration Risk [Line Items]
Total Exposure	35,984.2	554.9	35,000.0
Borrower 9 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	34,744.2		35,000.0
Borrower 9 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	1,240.0		0.0
Borrower 10
Concentration Risk [Line Items]
Total Exposure	35,945.8	$ 554.3	34,213.9
Borrower 10 | Funded Exposure
Concentration Risk [Line Items]
Total Exposure	7,502.1		33,549.0
Borrower 10 | Non-Funded Exposure
Concentration Risk [Line Items]
Total Exposure	₨ 28,443.7		₨ 664.9

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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