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Concentrations of Credit Risk (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019 INR (₨)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 INR (₨)	Mar. 31, 2019 USD ($)
Concentration Risk [Line Items]
Gross loans	₨ 9,111,464.6		₨ 7,376,179.0	$ 131,744.7
Fair Value Of Credit Substitutes	272,886.8		324,031.5	$ 3,945.8
Non-funded exposure	1,147,966.2		897,794.6
Total Exposure	₨ 10,532,317.6	$ 152,289.1	₨ 8,598,005.1
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	₨ 2,477,945.6		₨ 1,948,328.2
Fair Value Of Credit Substitutes	0.0
Non-funded exposure	1,552.1		665.4
Total Exposure	₨ 2,479,497.7	$ 35,851.6	₨ 1,948,993.6
Consumer Loans | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	23.50%	23.50%	22.70%
NBFC/Financial Intermediaries
Concentration Risk [Line Items]
Gross loans	₨ 311,477.1		₨ 231,249.9
Fair Value Of Credit Substitutes	98,274.0		110,494.4
Non-funded exposure	13,203.1		6,888.5
Total Exposure	₨ 422,954.2	$ 6,115.6	₨ 348,632.8
NBFC/Financial Intermediaries | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	4.00%	4.00%	4.10%
Retail Trade
Concentration Risk [Line Items]
Gross loans	₨ 445,757.8		₨ 385,217.8
Fair Value Of Credit Substitutes	1,170.7		1,181.4
Non-funded exposure	15,051.6		13,091.9
Total Exposure	₨ 461,980.1	$ 6,679.9	₨ 399,491.1
Retail Trade | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	4.40%	4.40%	4.60%
Automobile and Auto Ancillary
Concentration Risk [Line Items]
Gross loans	₨ 352,979.1		₨ 299,680.3
Fair Value Of Credit Substitutes	10,413.9		13,105.7
Non-funded exposure	32,546.7		30,876.7
Total Exposure	₨ 395,939.7	$ 5,725.0	₨ 343,662.7
Automobile and Auto Ancillary | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.80%	3.80%	4.00%
Agriculture Production - Food
Concentration Risk [Line Items]
Gross loans	₨ 330,092.5		₨ 318,643.5
Fair Value Of Credit Substitutes	0.0		497.9
Non-funded exposure	728.8		614.9
Total Exposure	₨ 330,821.3	$ 4,783.4	₨ 319,756.3
Agriculture Production - Food | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.10%	3.10%	3.70%
Consumer Services
Concentration Risk [Line Items]
Gross loans	₨ 354,060.4		₨ 308,333.2
Fair Value Of Credit Substitutes	3,957.3		3,461.5
Non-funded exposure	13,757.6		14,077.5
Total Exposure	₨ 371,775.3	$ 5,375.6	₨ 325,872.2
Consumer Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.50%	3.50%	3.80%
Wholesale Trade - Non Industrial
Concentration Risk [Line Items]
Gross loans	₨ 200,089.4		₨ 180,841.8
Fair Value Of Credit Substitutes	248.3		2,239.4
Non-funded exposure	12,218.2		11,945.7
Total Exposure	₨ 212,555.9	$ 3,073.4	₨ 195,026.9
Wholesale Trade - Non Industrial | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.00%	2.00%	2.30%
Road Transportation
Concentration Risk [Line Items]
Gross loans	₨ 376,547.1		₨ 310,740.7
Fair Value Of Credit Substitutes	0.0		0.0
Non-funded exposure	9,808.2		5,247.2
Total Exposure	₨ 386,355.3	$ 5,586.4	₨ 315,987.9
Road Transportation | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.70%	3.70%	3.70%
Wholesale Trade - Industrial
Concentration Risk [Line Items]
Gross loans	₨ 192,708.4		₨ 167,253.4
Fair Value Of Credit Substitutes	67.8		103.9
Non-funded exposure	29,835.7		27,470.1
Total Exposure	₨ 222,611.9	$ 3,218.8	₨ 194,827.4
Wholesale Trade - Industrial | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.10%	2.10%	2.30%
Agriculture Production-Non Food
Concentration Risk [Line Items]
Gross loans			₨ 199,451.2
Fair Value Of Credit Substitutes			0.0
Non-funded exposure			9.0
Total Exposure			₨ 199,460.2
Agriculture Production-Non Food | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.30%
Food And Beverage
Concentration Risk [Line Items]
Gross loans	₨ 233,798.9		₨ 210,780.7
Fair Value Of Credit Substitutes	0.0		586.8
Non-funded exposure	15,325.7		14,210.0
Total Exposure	₨ 249,124.6	$ 3,602.1	₨ 225,577.5
Food And Beverage | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.40%	2.40%	2.60%
Real Estate and Property Services
Concentration Risk [Line Items]
Gross loans	₨ 257,056.8		₨ 233,700.5
Fair Value Of Credit Substitutes	1,978.8		1,982.5
Non-funded exposure	33,482.7		27,280.7
Total Exposure	₨ 292,518.3	$ 4,229.6	₨ 262,963.7
Real Estate and Property Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.80%	2.80%	3.10%
Engineering
Concentration Risk [Line Items]
Gross loans	₨ 159,462.7		₨ 133,216.6
Fair Value Of Credit Substitutes	1,557.3		2,470.7
Non-funded exposure	120,816.0		99,933.4
Total Exposure	₨ 281,836.0	$ 4,075.1	₨ 235,620.7
Engineering | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.70%	2.70%	2.70%
Power
Concentration Risk [Line Items]
Gross loans	₨ 251,169.4		₨ 159,239.8
Fair Value Of Credit Substitutes	37,188.7		34,738.6
Non-funded exposure	39,998.4		36,017.7
Total Exposure	₨ 328,356.5	$ 4,747.8	₨ 229,996.1
Power | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.10%	3.10%	2.70%
Business Services
Concentration Risk [Line Items]
Gross loans	₨ 236,853.7		₨ 207,868.8
Fair Value Of Credit Substitutes	249.2		946.6
Non-funded exposure	11,318.3		7,738.7
Total Exposure	₨ 248,421.2	$ 3,592.0	₨ 216,554.1
Business Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.40%	2.40%	2.50%
Telecom
Concentration Risk [Line Items]
Gross loans	₨ 246,272.4		₨ 125,842.1
Fair Value Of Credit Substitutes	21,288.6		21,629.8
Non-funded exposure	26,245.9		27,802.9
Total Exposure	₨ 293,806.9	$ 4,248.2	₨ 175,274.8
Telecom | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.80%	2.80%	2.00%
Others (none greater than 2%)
Concentration Risk [Line Items]
Gross loans	₨ 2,081,399.0		₨ 1,439,682.5
Fair Value Of Credit Substitutes	76,801.2		52,825.4
Non-funded exposure	470,669.6		460,885.5
Total Exposure	₨ 2,628,869.8	$ 38,011.4	₨ 1,953,393.4
Others (none greater than 2%) | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	24.90%	24.90%	22.70%
Textiles and Garments
Concentration Risk [Line Items]
Gross loans	₨ 187,527.5		₨ 159,873.4
Fair Value Of Credit Substitutes	4,436.1		4,602.7
Non-funded exposure	26,803.8		20,496.0
Total Exposure	₨ 218,767.4	$ 3,163.2	₨ 184,972.1
Textiles and Garments | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.10%	2.10%	2.20%
Infrastructure Development
Concentration Risk [Line Items]
Gross loans	₨ 128,273.5		₨ 109,841.9
Fair Value Of Credit Substitutes	9,035.5		9,762.5
Non-funded exposure	79,596.8		55,773.0
Total Exposure	₨ 216,905.8	$ 3,136.3	₨ 175,377.4
Infrastructure Development | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.10%	2.10%	2.00%
Iron and Steel
Concentration Risk [Line Items]
Gross loans	₨ 195,488.6		₨ 135,431.1
Fair Value Of Credit Substitutes	5,514.4		2,583.1
Non-funded exposure	44,149.5		36,184.6
Total Exposure	₨ 245,152.5	$ 3,544.7	₨ 174,198.8
Iron and Steel | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.30%	2.30%	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
Housing Finance | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.00%
Coal & Petroleum Products
Concentration Risk [Line Items]
Gross loans	₨ 92,504.7
Fair Value Of Credit Substitutes	705.0
Non-funded exposure	150,857.5
Total Exposure	₨ 244,067.2	$ 3,529.0
Coal & Petroleum Products | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.30%	2.30%

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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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