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Concentrations of Credit Risk (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018 INR (₨)	Mar. 31, 2017 INR (₨)	Mar. 31, 2018 USD ($)
Concentration Risk [Line Items]
Gross loans	₨ 7,376,179.0	₨ 5,988,909.7	$ 113,288.0
Fair Value Of Credit Substitutes	324,031.5	419,540.6	4,976.7
Non-funded exposure	897,794.6	868,225.1
Total Exposure	₨ 8,598,005.1	₨ 7,276,675.4	132,053.6
Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	100.00%	100.00%
Consumer Loans
Concentration Risk [Line Items]
Gross loans	₨ 1,948,328.2	₨ 1,526,978.2
Non-funded exposure	665.4	0.2
Total Exposure	₨ 1,948,993.6	₨ 1,526,978.4	29,933.9
Consumer Loans | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	22.70%	21.00%
NBFC/Financial Intermediaries
Concentration Risk [Line Items]
Gross loans	₨ 231,249.9	₨ 180,220.7
Fair Value Of Credit Substitutes	110,494.4	158,378.6
Non-funded exposure	6,888.5	5,211.1
Total Exposure	₨ 348,632.8	₨ 343,810.4	5,354.5
NBFC/Financial Intermediaries | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	4.10%	4.70%
Retail Trade
Concentration Risk [Line Items]
Gross loans	₨ 385,217.8	₨ 320,876.9
Fair Value Of Credit Substitutes	1,181.4	2,941.7
Non-funded exposure	13,091.9	9,952.3
Total Exposure	₨ 399,491.1	₨ 333,770.9	6,135.6
Retail Trade | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	4.60%	4.60%
Automobile and Auto Ancillary
Concentration Risk [Line Items]
Gross loans	₨ 299,680.3	₨ 240,301.6
Fair Value Of Credit Substitutes	13,105.7	31,661.9
Non-funded exposure	30,876.7	24,816.3
Total Exposure	₨ 343,662.7	₨ 296,779.8	5,278.2
Automobile and Auto Ancillary | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	4.00%	4.10%
Agriculture Production - Food
Concentration Risk [Line Items]
Gross loans	₨ 318,643.5	₨ 282,673.8
Fair Value Of Credit Substitutes	497.9	2,075.0
Non-funded exposure	614.9	458.3
Total Exposure	₨ 319,756.3	₨ 285,207.1	4,911.0
Agriculture Production - Food | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.70%	3.90%
Consumer Services
Concentration Risk [Line Items]
Gross loans	₨ 308,333.2	₨ 260,053.9
Fair Value Of Credit Substitutes	3,461.5	4,500.5
Non-funded exposure	14,077.5	20,152.1
Total Exposure	₨ 325,872.2	₨ 284,706.5	5,004.9
Consumer Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.80%	3.90%
Wholesale Trade - Non Industrial
Concentration Risk [Line Items]
Gross loans	₨ 180,841.8	₨ 232,111.9
Fair Value Of Credit Substitutes	2,239.4	5,190.8
Non-funded exposure	11,945.7	20,611.1
Total Exposure	₨ 195,026.9	₨ 257,913.8	2,995.3
Wholesale Trade - Non Industrial | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.30%	3.60%
Road Transportation
Concentration Risk [Line Items]
Gross loans	₨ 310,740.7	₨ 241,771.3
Non-funded exposure	5,247.2	4,104.8
Total Exposure	₨ 315,987.9	₨ 245,876.1	4,853.1
Road Transportation | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.70%	3.40%
Wholesale Trade - Industrial
Concentration Risk [Line Items]
Gross loans	₨ 167,253.4	₨ 166,940.1
Fair Value Of Credit Substitutes	103.9	3,144.3
Non-funded exposure	27,470.1	34,878.0
Total Exposure	₨ 194,827.4	₨ 204,962.4	2,992.3
Wholesale Trade - Industrial | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.30%	2.80%
Agriculture Production-Non Food
Concentration Risk [Line Items]
Gross loans	₨ 199,451.2	₨ 202,350.3
Non-funded exposure	9.0	1.5
Total Exposure	₨ 199,460.2	₨ 202,351.8	3,063.4
Agriculture Production-Non Food | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.30%	2.80%
Food And Beverage
Concentration Risk [Line Items]
Gross loans	₨ 210,780.7	₨ 166,494.3
Fair Value Of Credit Substitutes	586.8	12,354.5
Non-funded exposure	14,210.0	12,309.0
Total Exposure	₨ 225,577.5	₨ 191,157.8	3,464.6
Food And Beverage | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.60%	2.60%
Real Estate and Property Services
Concentration Risk [Line Items]
Gross loans	₨ 233,700.5	₨ 168,660.4
Fair Value Of Credit Substitutes	1,982.5	1,585.4
Non-funded exposure	27,280.7	20,566.5
Total Exposure	₨ 262,963.7	₨ 190,812.3	4,038.8
Real Estate and Property Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.10%	2.60%
Engineering
Concentration Risk [Line Items]
Gross loans	₨ 133,216.6	₨ 110,827.8
Fair Value Of Credit Substitutes	2,470.7	4,900.7
Non-funded exposure	99,933.4	74,511.2
Total Exposure	₨ 235,620.7	₨ 190,239.7	3,618.8
Engineering | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.70%	2.60%
Coal & Petroleum Products
Concentration Risk [Line Items]
Gross loans		₨ 48,513.8
Fair Value Of Credit Substitutes		2,136.8
Non-funded exposure		123,490.2
Total Exposure		₨ 174,140.8
Coal & Petroleum Products | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%		2.40%
Power
Concentration Risk [Line Items]
Gross loans	₨ 159,239.8	₨ 125,213.0
Fair Value Of Credit Substitutes	34,738.6	20,395.7
Non-funded exposure	36,017.7	24,455.8
Total Exposure	₨ 229,996.1	₨ 170,064.5	3,532.4
Power | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.70%	2.30%
Business Services
Concentration Risk [Line Items]
Gross loans	₨ 207,868.8	₨ 159,666.1
Fair Value Of Credit Substitutes	946.6	1,786.1
Non-funded exposure	7,738.7	6,561.8
Total Exposure	₨ 216,554.1	₨ 168,014.0	3,326.0
Business Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.50%	2.30%
Banks and Financial Institutions
Concentration Risk [Line Items]
Gross loans		₨ 40,763.1
Fair Value Of Credit Substitutes		3,402.7
Non-funded exposure		122,099.8
Total Exposure		₨ 166,265.6
Banks and Financial Institutions | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%		2.30%
Telecom
Concentration Risk [Line Items]
Gross loans	₨ 125,842.1	₨ 108,104.6
Fair Value Of Credit Substitutes	21,629.8	21,406.2
Non-funded exposure	27,802.9	20,134.3
Total Exposure	₨ 175,274.8	₨ 149,645.1	2,692.0
Telecom | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.00%	2.10%
Others (none greater than 2%)
Concentration Risk [Line Items]
Gross loans	₨ 1,439,682.5	₨ 1,406,387.9
Fair Value Of Credit Substitutes	52,825.4	143,679.7
Non-funded exposure	460,885.5	343,910.8
Total Exposure	₨ 1,953,393.4	₨ 1,893,978.4	30,001.5
Others (none greater than 2%) | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	22.70%	26.00%
Textiles and Garments
Concentration Risk [Line Items]
Gross loans	₨ 159,873.4
Fair Value Of Credit Substitutes	4,602.7
Non-funded exposure	20,496.0
Total Exposure	₨ 184,972.1		2,840.9
Textiles and Garments | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.20%
Infrastructure Development
Concentration Risk [Line Items]
Gross loans	₨ 109,841.9
Fair Value Of Credit Substitutes	9,762.5
Non-funded exposure	55,773.0
Total Exposure	₨ 175,377.4		2,693.6
Infrastructure Development | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.00%
Iron and Steel
Concentration Risk [Line Items]
Gross loans	₨ 135,431.1
Fair Value Of Credit Substitutes	2,583.1
Non-funded exposure	36,184.6
Total Exposure	₨ 174,198.8		2,675.5
Iron and Steel | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.00%
Housing Finance
Concentration Risk [Line Items]
Gross loans	₨ 110,961.6
Fair Value Of Credit Substitutes	60,818.6
Non-funded exposure	585.2
Total Exposure	₨ 172,365.4		$ 2,647.3
Housing Finance | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.00%

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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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