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Concentrations of Credit Risk (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2023 INR (₨)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 INR (₨)	Mar. 31, 2023 USD ($)
Concentration Risk [Line Items]
Gross loans	₨ 17,418,092.4		₨ 14,409,544.0	$ 211,924.7
Fair value of credit substitutes	503,187.8		583,020.2	$ 6,122.3
Non-funded exposure	1,750,449.2		1,535,475.3
Total Exposure	₨ 19,671,729.4	$ 239,344.5	₨ 16,528,039.5
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	₨ 4,410,346.6		₨ 3,746,781.7
Fair value of credit substitutes	0.0		0.0
Non-funded exposure	2,550.8		3,035.7
Total Exposure	₨ 4,412,897.4	$ 53,691.4	₨ 3,749,817.4
Consumer Loans | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	22.40%	22.40%	22.70%
Retail Trade
Concentration Risk [Line Items]
Gross loans	₨ 973,274.3		₨ 589,947.3
Fair value of credit substitutes	0.0		0.0
Non-funded exposure	36,013.4		28,857.8
Total Exposure	₨ 1,009,287.7	$ 12,279.9	₨ 618,805.1
Retail Trade | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	5.10%	5.10%	3.70%
Power
Concentration Risk [Line Items]
Gross loans	₨ 695,716.5		₨ 671,859.4
Fair value of credit substitutes	64,805.5		70,346.0
Non-funded exposure	45,576.3		52,366.6
Total Exposure	₨ 806,098.3	$ 9,807.7	₨ 794,572.0
Power | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	4.10%	4.10%	4.80%
Consumer Services
Concentration Risk [Line Items]
Gross loans	₨ 581,272.1		₨ 465,465.8
Fair value of credit substitutes	3,545.4		0.0
Non-funded exposure	123,464.7		28,102.4
Total Exposure	₨ 708,282.2	$ 8,617.6	₨ 493,568.2
Consumer Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.60%	3.60%	3.00%
Engineering
Concentration Risk [Line Items]
Gross loans	₨ 300,745.5		₨ 253,105.1
Fair value of credit substitutes	5,596.0		6,666.6
Non-funded exposure	131,956.5		105,164.7
Total Exposure	₨ 438,298.0	$ 5,332.7	₨ 364,936.4
Engineering | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.20%	2.20%	2.20%
NBFC
Concentration Risk [Line Items]
Gross loans	₨ 690,783.9		₨ 509,445.4
Fair value of credit substitutes	91,595.9		106,764.5
Non-funded exposure	15,995.5		5,818.5
Total Exposure	₨ 798,375.3	$ 9,713.8	₨ 622,028.4
NBFC | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	4.10%	4.10%	3.80%
Road Transportation
Concentration Risk [Line Items]
Gross loans	₨ 568,414.2		₨ 406,376.4
Fair value of credit substitutes	0.0		0.0
Non-funded exposure	12,512.4		10,269.5
Total Exposure	₨ 580,926.6	$ 7,068.1	₨ 416,645.9
Road Transportation | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.00%	3.00%	2.50%
Automobile and Auto Ancillary
Concentration Risk [Line Items]
Gross loans	₨ 483,658.4		₨ 443,538.7
Fair value of credit substitutes	17,656.8		19,768.7
Non-funded exposure	38,921.4		36,999.9
Total Exposure	₨ 540,236.6	$ 6,573.0	₨ 500,307.3
Automobile and Auto Ancillary | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.70%	2.70%	3.00%
Real Estate and Property Services
Concentration Risk [Line Items]
Gross loans	₨ 458,906.6		₨ 383,765.5
Fair value of credit substitutes	4,691.4		4,792.6
Non-funded exposure	52,228.7		40,694.4
Total Exposure	₨ 515,826.7	$ 6,276.0	₨ 429,252.5
Real Estate and Property Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.60%	2.60%	2.60%
Agri Production—Food
Concentration Risk [Line Items]
Gross loans	₨ 401,720.3		₨ 350,859.6
Fair value of credit substitutes	0.0		0.0
Non-funded exposure	1,040.5		963.1
Total Exposure	₨ 402,760.8	$ 4,900.4	₨ 351,822.7
Agri Production—Food | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.00%	2.00%	2.10%
Coal & Petroleum Products
Concentration Risk [Line Items]
Gross loans	₨ 353,329.8		₨ 233,583.7
Fair value of credit substitutes	115,279.8		174,424.6
Non-funded exposure	102,771.3		149,716.9
Total Exposure	₨ 571,380.9	$ 6,952.0	₨ 557,725.2
Coal & Petroleum Products | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.90%	2.90%	3.40%
Food And Beverage
Concentration Risk [Line Items]
Gross loans	₨ 566,172.9		₨ 433,042.2
Fair value of credit substitutes	1,419.2		0.0
Non-funded exposure	49,084.4		39,007.2
Total Exposure	₨ 616,676.5	$ 7,503.1	₨ 472,049.4
Food And Beverage | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.10%	3.10%	2.90%
Financial Institutions
Concentration Risk [Line Items]
Gross loans	₨ 659,117.5		₨ 618,494.1
Fair value of credit substitutes	72,068.3		51,844.1
Non-funded exposure	4,435.4		13.1
Total Exposure	₨ 735,621.2	$ 8,950.3	₨ 670,351.3
Financial Institutions | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.70%	3.70%	4.10%
Agri—Allied
Concentration Risk [Line Items]
Gross loans	₨ 431,581.2
Fair value of credit substitutes	0.0
Non-funded exposure	2,701.2
Total Exposure	₨ 434,282.4	$ 5,283.9
Agri—Allied | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.20%	2.20%
Iron and Steel
Concentration Risk [Line Items]
Gross loans	₨ 360,021.9		₨ 321,587.7
Fair value of credit substitutes	12,231.9		12,486.0
Non-funded exposure	61,224.3		80,515.7
Total Exposure	₨ 433,478.1	$ 5,274.1	₨ 414,589.4
Iron and Steel | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.20%	2.20%	2.50%
Telecom
Concentration Risk [Line Items]
Gross loans	₨ 365,112.3		₨ 331,131.1
Fair value of credit substitutes	0.0		2,989.4
Non-funded exposure	42,221.1		43,335.9
Total Exposure	₨ 407,333.4	$ 4,956.0	₨ 377,456.4
Telecom | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.10%	2.10%	2.30%
Infrastructure Development
Concentration Risk [Line Items]
Gross loans	₨ 284,690.7		₨ 272,428.0
Fair value of credit substitutes	15,220.2		18,032.7
Non-funded exposure	170,452.2		220,442.5
Total Exposure	₨ 470,363.1	$ 5,722.9	₨ 510,903.2
Infrastructure Development | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.40%	2.40%	3.10%
Wholesale Trade—Non Industrial
Concentration Risk [Line Items]
Gross loans	₨ 530,057.5		₨ 417,954.8
Fair value of credit substitutes	1,988.8		0.0
Non-funded exposure	31,887.0		26,147.5
Total Exposure	₨ 563,933.3	$ 6,861.3	₨ 444,102.3
Wholesale Trade—Non Industrial | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.90%	2.90%	2.70%
Wholesale Trade—Industrial
Concentration Risk [Line Items]
Gross loans	₨ 421,900.9		₨ 347,202.9
Fair value of credit substitutes	0.0		0.0
Non-funded exposure	70,853.6		73,867.5
Total Exposure	₨ 492,754.5	$ 5,995.3	₨ 421,070.4
Wholesale Trade—Industrial | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.50%	2.50%	2.50%
Others (none greater than 2%)
Concentration Risk [Line Items]
Gross loans	₨ 3,490,386.3		₨ 3,288,555.0
Fair value of credit substitutes	92,104.1		108,769.3
Non-funded exposure	719,829.4		546,407.8
Total Exposure	₨ 4,302,319.8	$ 52,346.0	₨ 3,943,732.1
Others (none greater than 2%) | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	22.00%	22.00%	23.80%
Textiles and Garments
Concentration Risk [Line Items]
Gross loans	₨ 390,883.0		₨ 324,419.6
Fair value of credit substitutes	4,984.5		6,135.7
Non-funded exposure	34,729.1		43,748.6
Total Exposure	₨ 430,596.6	$ 5,239.0	₨ 374,303.9
Textiles and Garments | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.20%	2.20%	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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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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