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Concentrations of Credit Risk (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2016 INR (₨)	Mar. 31, 2015 INR (₨)	Mar. 31, 2016 USD ($)
Concentration Risk [Line Items]
Gross loans	₨ 4,992,834.4	₨ 3,943,449.1	$ 75,363.5
Fair Value Of Credit Substitutes	297,241.0	195,058.9
Non-funded exposure	737,363.6	628,002.3
Total Exposure	₨ 6,027,439.0	₨ 4,766,510.3	90,980.2
Lender Concentration Risk
Concentration Risk [Line Items]
%	100.00%	100.00%
Consumer Loans
Concentration Risk [Line Items]
Gross loans	₨ 670,622.8	₨ 479,467.5
Fair Value Of Credit Substitutes	0.0	0.0
Non-funded exposure	21.6	17.6
Total Exposure	₨ 670,644.4	₨ 479,485.1	10,122.9
Consumer Loans | Lender Concentration Risk
Concentration Risk [Line Items]
%	11.10%	10.10%
Activities allied to agriculture
Concentration Risk [Line Items]
Gross loans	₨ 550,848.4	₨ 422,894.4
Fair Value Of Credit Substitutes	0.0	0.0
Non-funded exposure	1,616.2	1,697.6
Total Exposure	₨ 552,464.6	₨ 424,592.0	8,339.1
Activities allied to agriculture | Lender Concentration Risk
Concentration Risk [Line Items]
%	9.30%	8.90%
Wholesale Trade
Concentration Risk [Line Items]
Gross loans	₨ 349,927.1	₨ 308,806.4
Fair Value Of Credit Substitutes	12,389.4	5,259.8
Non-funded exposure	36,108.5	31,745.5
Total Exposure	₨ 398,425.0	₨ 345,811.7	6,014.0
Wholesale Trade | Lender Concentration Risk
Concentration Risk [Line Items]
%	6.60%	7.30%
Services
Concentration Risk [Line Items]
Gross loans	₨ 306,593.9	₨ 230,040.6
Fair Value Of Credit Substitutes	3,425.4	445.9
Non-funded exposure	22,997.3	15,511.7
Total Exposure	₨ 333,016.6	₨ 245,998.2	5,026.7
Services | Lender Concentration Risk
Concentration Risk [Line Items]
%	5.50%	5.20%
Automobile and Auto Ancillary
Concentration Risk [Line Items]
Gross loans	₨ 199,606.7	₨ 192,017.4
Fair Value Of Credit Substitutes	11,092.6	23,046.5
Non-funded exposure	16,579.9	16,357.7
Total Exposure	₨ 227,279.2	₨ 231,421.6	3,430.6
Automobile and Auto Ancillary | Lender Concentration Risk
Concentration Risk [Line Items]
%	3.80%	4.90%
Retail Trade
Concentration Risk [Line Items]
Gross loans	₨ 253,373.6	₨ 189,593.5
Fair Value Of Credit Substitutes	4,721.8	841.2
Non-funded exposure	8,747.7	4,761.4
Total Exposure	₨ 266,843.1	₨ 195,196.1	4,027.8
Retail Trade | Lender Concentration Risk
Concentration Risk [Line Items]
%	4.40%	4.10%
Coal & Petroleum Products
Concentration Risk [Line Items]
Gross loans	₨ 46,279.5	₨ 40,153.4
Fair Value Of Credit Substitutes	5,173.9	5,984.5
Non-funded exposure	108,033.7	111,908.1
Total Exposure	₨ 159,487.1	₨ 158,046.0	2,407.4
Coal & Petroleum Products | Lender Concentration Risk
Concentration Risk [Line Items]
%	2.60%	3.30%
NBFC/Financial Intermediaries
Concentration Risk [Line Items]
Gross loans	₨ 130,684.6	₨ 94,744.7
Fair Value Of Credit Substitutes	89,328.1	59,985.8
Non-funded exposure	2,174.3	1,876.5
Total Exposure	₨ 222,187.0	₨ 156,607.0	3,353.8
NBFC/Financial Intermediaries | Lender Concentration Risk
Concentration Risk [Line Items]
%	3.70%	3.30%
Food And Beverage
Concentration Risk [Line Items]
Gross loans	₨ 152,253.7	₨ 121,172.2
Fair Value Of Credit Substitutes	3,235.9	7,040.2
Non-funded exposure	7,814.2	6,734.9
Total Exposure	₨ 163,303.8	₨ 134,947.3	2,465.0
Food And Beverage | Lender Concentration Risk
Concentration Risk [Line Items]
%	2.70%	2.80%
Land Transport
Concentration Risk [Line Items]
Gross loans	₨ 183,707.5	₨ 131,240.2
Fair Value Of Credit Substitutes	690.7	522.1
Non-funded exposure	3,342.8	2,668.8
Total Exposure	₨ 187,741.0	₨ 134,431.1	2,833.8
Land Transport | Lender Concentration Risk
Concentration Risk [Line Items]
%	3.10%	2.80%
Power
Concentration Risk [Line Items]
Gross loans	₨ 103,437.7	₨ 96,169.7
Fair Value Of Credit Substitutes	15,770.2	15,846.8
Non-funded exposure	23,495.7	18,570.3
Total Exposure	₨ 142,703.6	₨ 130,586.8	2,154.0
Power | Lender Concentration Risk
Concentration Risk [Line Items]
%	2.40%	2.70%
Engineering
Concentration Risk [Line Items]
Gross loans	₨ 95,022.6	₨ 79,747.2
Fair Value Of Credit Substitutes	9,122.4	1,077.1
Non-funded exposure	67,166.1	48,819.8
Total Exposure	₨ 171,311.1	₨ 129,644.1	2,585.8
Engineering | Lender Concentration Risk
Concentration Risk [Line Items]
%	2.80%	2.70%
Real estate and Property services
Concentration Risk [Line Items]
Gross loans	₨ 121,992.9	₨ 88,264.9
Fair Value Of Credit Substitutes	3,200.9	3,607.0
Non-funded exposure	16,380.3	11,179.6
Total Exposure	₨ 141,574.1	₨ 103,051.5	2,137.0
Real estate and Property services | Lender Concentration Risk
Concentration Risk [Line Items]
%	2.30%	2.20%
Iron and Steel
Concentration Risk [Line Items]
Gross loans	₨ 97,934.7	₨ 84,913.9
Fair Value Of Credit Substitutes	19,910.6	1,475.8
Non-funded exposure	17,559.2	15,927.1
Total Exposure	₨ 135,404.5	₨ 102,316.8	2,043.8
Iron and Steel | Lender Concentration Risk
Concentration Risk [Line Items]
%	2.20%	2.10%
Others (none greater than 2%)
Concentration Risk [Line Items]
Gross loans	₨ 1,730,548.7	₨ 1,384,223.1
Fair Value Of Credit Substitutes	119,179.1	69,926.2
Non-funded exposure	405,326.1	340,225.7
Total Exposure	₨ 2,255,053.9	₨ 1,794,375.0	$ 34,038.5
Others (none greater than 2%) | Lender Concentration Risk
Concentration Risk [Line Items]
%	37.50%	37.60%

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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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Amount of unfunded commitments for which the entity is obligated, including, but not limited to, financial standby letter of credit, value of guarantees, contracts that contingently require the guarantor to make payments or perform services.

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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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