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Concentrations of Credit Risk (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2020 INR (₨)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 INR (₨)	Mar. 31, 2020 USD ($)
Concentration Risk [Line Items]
Gross loans	₨ 10,623,855.6		₨ 9,111,464.6	$ 140,918.6
Fair Value Of Credit Substitutes	362,373.7		272,886.8	$ 4,806.7
Non-funded exposure	1,224,692.9		1,147,966.2
Total Exposure	₨ 12,210,922.2	$ 161,969.9	₨ 10,532,317.6
Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	100.00%	100.00%	100.00%
Consumer Loans
Concentration Risk [Line Items]
Gross loans	₨ 2,958,437.7		₨ 2,477,945.6
Fair Value Of Credit Substitutes	2,756.6		0.0
Non-funded exposure	446.4		1,552.1
Total Exposure	₨ 2,961,640.7	$ 39,284.3	₨ 2,479,497.7
Consumer Loans | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	24.30%	24.30%	23.50%
Retail Trade
Concentration Risk [Line Items]
Gross loans	₨ 533,155.3		₨ 445,757.8
Fair Value Of Credit Substitutes	343.7		1,170.7
Non-funded exposure	22,820.3		15,051.6
Total Exposure	₨ 556,319.3	$ 7,379.2	₨ 461,980.1
Retail Trade | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	4.60%	4.60%	4.40%
NBFC/Financial Intermediaries
Concentration Risk [Line Items]
Gross loans	₨ 317,450.0		₨ 311,477.1
Fair Value Of Credit Substitutes	76,860.2		98,274.0
Non-funded exposure	1,659.1		13,203.1
Total Exposure	₨ 395,969.3	$ 5,252.3	₨ 422,954.2
NBFC/Financial Intermediaries | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.20%	3.20%	4.00%
Automobile and Auto Ancillary
Concentration Risk [Line Items]
Gross loans	₨ 330,632.5		₨ 352,979.1
Fair Value Of Credit Substitutes	18,397.9		10,413.9
Non-funded exposure	33,037.0		32,546.7
Total Exposure	₨ 382,067.4	$ 5,067.9	₨ 395,939.7
Automobile and Auto Ancillary | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.10%	3.10%	3.80%
Road Transportation
Concentration Risk [Line Items]
Gross loans	₨ 376,334.2		₨ 376,547.1
Fair Value Of Credit Substitutes	495.3		0.0
Non-funded exposure	10,849.7		9,808.2
Total Exposure	₨ 387,679.2	$ 5,142.3	₨ 386,355.3
Road Transportation | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.20%	3.20%	3.70%
Consumer Services
Concentration Risk [Line Items]
Gross loans	₨ 399,046.4		₨ 354,060.4
Fair Value Of Credit Substitutes	2,015.1		3,957.3
Non-funded exposure	19,135.9		13,757.6
Total Exposure	₨ 420,197.4	$ 5,573.6	₨ 371,775.3
Consumer Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.40%	3.40%	3.50%
Agriculture Production - Food
Concentration Risk [Line Items]
Gross loans	₨ 313,143.6		₨ 330,092.5
Fair Value Of Credit Substitutes	0.0		0.0
Non-funded exposure	833.3		728.8
Total Exposure	₨ 313,976.9	$ 4,164.7	₨ 330,821.3
Agriculture Production - Food | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.60%	2.60%	3.10%
Power
Concentration Risk [Line Items]
Gross loans	₨ 458,628.1		₨ 251,169.4
Fair Value Of Credit Substitutes	48,997.7		37,188.7
Non-funded exposure	41,445.6		39,998.4
Total Exposure	₨ 549,071.4	$ 7,283.1	₨ 328,356.5
Power | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	4.50%	4.50%	3.10%
Telecom
Concentration Risk [Line Items]
Gross loans	₨ 232,932.0		₨ 246,272.4
Fair Value Of Credit Substitutes	10,412.6		21,288.6
Non-funded exposure	29,949.6		26,245.9
Total Exposure	₨ 273,294.2	$ 3,625.1	₨ 293,806.9
Telecom | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.20%	2.20%	2.80%
Real Estate and Property Services
Concentration Risk [Line Items]
Gross loans	₨ 280,870.4		₨ 257,056.8
Fair Value Of Credit Substitutes	4,309.5		1,978.8
Non-funded exposure	36,335.2		33,482.7
Total Exposure	₨ 321,515.1	$ 4,264.7	₨ 292,518.3
Real Estate and Property Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.60%	2.60%	2.80%
Engineering
Concentration Risk [Line Items]
Gross loans	₨ 240,196.0		₨ 159,462.7
Fair Value Of Credit Substitutes	12,255.3		1,557.3
Non-funded exposure	144,296.9		120,816.0
Total Exposure	₨ 396,748.2	$ 5,262.6	₨ 281,836.0
Engineering | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.20%	3.20%	2.70%
Food And Beverage
Concentration Risk [Line Items]
Gross loans	₨ 260,907.9		₨ 233,798.9
Fair Value Of Credit Substitutes	1,391.3		0.0
Non-funded exposure	21,853.6		15,325.7
Total Exposure	₨ 284,152.8	$ 3,769.1	₨ 249,124.6
Food And Beverage | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.30%	2.30%	2.40%
Financial Institutions
Concentration Risk [Line Items]
Gross loans	₨ 219,417.5
Fair Value Of Credit Substitutes	59,118.8
Non-funded exposure	2,058.7
Total Exposure	₨ 280,595.0	$ 3,721.9
Financial Institutions | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.30%	2.30%
Business Services
Concentration Risk [Line Items]
Gross loans	₨ 244,028.7		₨ 236,853.7
Fair Value Of Credit Substitutes	2,278.5		249.2
Non-funded exposure	15,953.3		11,318.3
Total Exposure	₨ 262,260.5	$ 3,478.7	₨ 248,421.2
Business Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.10%	2.10%	2.40%
Iron and Steel
Concentration Risk [Line Items]
Gross loans	₨ 231,524.9		₨ 195,488.6
Fair Value Of Credit Substitutes	1,144.7		5,514.4
Non-funded exposure	45,235.4		44,149.5
Total Exposure	₨ 277,905.0	$ 3,686.2	₨ 245,152.5
Iron and Steel | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.30%	2.30%	2.30%
Coal & Petroleum Products
Concentration Risk [Line Items]
Gross loans	₨ 136,531.9		₨ 92,504.7
Fair Value Of Credit Substitutes	33,834.9		705.0
Non-funded exposure	115,440.2		150,857.5
Total Exposure	₨ 285,807.0	$ 3,791.0	₨ 244,067.2
Coal & Petroleum Products | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.30%	2.30%	2.30%
Wholesale Trade - Industrial
Concentration Risk [Line Items]
Gross loans	₨ 211,849.6		₨ 192,708.4
Fair Value Of Credit Substitutes	34.2		67.8
Non-funded exposure	34,840.2		29,835.7
Total Exposure	₨ 246,724.0	$ 3,272.6	₨ 222,611.9
Wholesale Trade - Industrial | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.00%	2.00%	2.10%
Textiles and Garments
Concentration Risk [Line Items]
Gross loans			₨ 187,527.5
Fair Value Of Credit Substitutes			4,436.1
Non-funded exposure			26,803.8
Total Exposure			₨ 218,767.4
Textiles and Garments | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.10%
Infrastructure Development
Concentration Risk [Line Items]
Gross loans	₨ 165,578.8		₨ 128,273.5
Fair Value Of Credit Substitutes	2,457.1		9,035.5
Non-funded exposure	104,731.8		79,596.8
Total Exposure	₨ 272,767.7	$ 3,618.1	₨ 216,905.8
Infrastructure Development | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.20%	2.20%	2.10%
Wholesale Trade - Non Industrial
Concentration Risk [Line Items]
Gross loans	₨ 238,436.5		₨ 200,089.4
Fair Value Of Credit Substitutes	0.0		248.3
Non-funded exposure	18,766.1		12,218.2
Total Exposure	₨ 257,202.6	$ 3,411.6	₨ 212,555.9
Wholesale Trade - Non Industrial | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.10%	2.10%	2.00%
Others (none greater than 2%)
Concentration Risk [Line Items]
Gross loans	₨ 2,474,753.6		₨ 2,081,399.0
Fair Value Of Credit Substitutes	85,270.3		76,801.2
Non-funded exposure	525,004.6		470,669.6
Total Exposure	₨ 3,085,028.5	$ 40,920.9	₨ 2,628,869.8
Others (none greater than 2%) | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	25.50%	25.50%	24.90%

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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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Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, 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 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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