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Concentrations of Credit Risk (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2024 INR (₨)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 INR (₨)	Mar. 31, 2024 USD ($)
Concentration Risk [Line Items]
Gross loans	₨ 26,793,047.4		₨ 17,418,092.4
Fair value of credit substitutes	131,486.9		503,187.8	$ 1,577.7
Non-funded exposure	2,103,968.0		1,750,449.2
Total Exposure	₨ 29,028,502.3	$ 348,314.2	₨ 19,671,729.4
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	₨ 10,191,521.5		₨ 4,410,346.6
Fair value of credit substitutes	0.0		0.0
Non-funded exposure	468.1		2,550.8
Total Exposure	₨ 10,191,989.6	$ 122,294.1	₨ 4,412,897.4
Consumer Loans | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	35.10%	35.10%	22.40%
Retail Trade
Concentration Risk [Line Items]
Gross loans	₨ 1,085,962.9		₨ 973,274.3
Fair value of credit substitutes	0.0		0.0
Non-funded exposure	56,822.6		36,013.4
Total Exposure	₨ 1,142,785.5	$ 13,712.3	₨ 1,009,287.7
Retail Trade | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.90%	3.90%	5.10%
Power
Concentration Risk [Line Items]
Gross loans	₨ 770,473.1		₨ 695,716.5
Fair value of credit substitutes	37,706.9		64,805.5
Non-funded exposure	63,452.3		45,576.3
Total Exposure	₨ 871,632.3	$ 10,458.8	₨ 806,098.3
Power | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.00%	3.00%	4.10%
NBFC
Concentration Risk [Line Items]
Gross loans	₨ 1,725,559.7		₨ 690,783.9
Fair value of credit substitutes	20,585.6		91,595.9
Non-funded exposure	5,153.7		15,995.5
Total Exposure	₨ 1,751,299.0	$ 21,013.9	₨ 798,375.3
NBFC | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	6.00%	6.00%	4.10%
Financial Institutions
Concentration Risk [Line Items]
Gross loans			₨ 659,117.5
Fair value of credit substitutes			72,068.3
Non-funded exposure			4,435.4
Total Exposure			₨ 735,621.2
Financial Institutions | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			3.70%
Consumer Services
Concentration Risk [Line Items]
Gross loans	₨ 860,297.1		₨ 581,272.1
Fair value of credit substitutes	0.0		3,545.4
Non-funded exposure	35,933.7		123,464.7
Total Exposure	₨ 896,230.8	$ 10,753.9	₨ 708,282.2
Consumer Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.10%	3.10%	3.60%
Food and Beverage
Concentration Risk [Line Items]
Gross loans	₨ 712,895.6		₨ 566,172.9
Fair value of credit substitutes	1,405.1		1,419.2
Non-funded exposure	59,163.2		49,084.4
Total Exposure	₨ 773,463.9	$ 9,280.8	₨ 616,676.5
Food and Beverage | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.70%	2.70%	3.10%
Road Transportation
Concentration Risk [Line Items]
Gross loans	₨ 741,738.6		₨ 568,414.2
Fair value of credit substitutes	0.0		0.0
Non-funded exposure	11,160.3		12,512.4
Total Exposure	₨ 752,898.9	$ 9,034.1	₨ 580,926.6
Road Transportation | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.60%	2.60%	3.00%
Coal & Petroleum Products
Concentration Risk [Line Items]
Gross loans			₨ 353,329.8
Fair value of credit substitutes			115,279.8
Non-funded exposure			102,771.3
Total Exposure			₨ 571,380.9
Coal & Petroleum Products | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.90%
Wholesale Trade—Non Industrial
Concentration Risk [Line Items]
Gross loans			₨ 530,057.5
Fair value of credit substitutes			1,988.8
Non-funded exposure			31,887.0
Total Exposure			₨ 563,933.3
Wholesale Trade—Non Industrial | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.90%
Automobile & Auto Ancillary
Concentration Risk [Line Items]
Gross loans			₨ 483,658.4
Fair value of credit substitutes			17,656.8
Non-funded exposure			38,921.4
Total Exposure			₨ 540,236.6
Automobile & Auto Ancillary | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.70%
Real Estate & Property Services
Concentration Risk [Line Items]
Gross loans	₨ 1,070,220.3		₨ 458,906.6
Fair value of credit substitutes	3,495.0		4,691.4
Non-funded exposure	57,556.4		52,228.7
Total Exposure	₨ 1,131,271.7	$ 13,574.2	₨ 515,826.7
Real Estate & Property Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.90%	3.90%	2.60%
Wholesale Trade—Industrial
Concentration Risk [Line Items]
Gross loans			₨ 421,900.9
Fair value of credit substitutes			0.0
Non-funded exposure			70,853.6
Total Exposure			₨ 492,754.5
Wholesale Trade—Industrial | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.50%
Infrastructure Development
Concentration Risk [Line Items]
Gross loans	₨ 450,183.2		₨ 284,690.7
Fair value of credit substitutes	6,716.0		15,220.2
Non-funded exposure	336,982.5		170,452.2
Total Exposure	₨ 793,881.7	$ 9,525.8	₨ 470,363.1
Infrastructure Development | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.70%	2.70%	2.40%
Engineering
Concentration Risk [Line Items]
Gross loans			₨ 300,745.5
Fair value of credit substitutes			5,596.0
Non-funded exposure			131,956.5
Total Exposure			₨ 438,298.0
Engineering | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.20%
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
Agri—Allied | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.20%
Iron and Steel
Concentration Risk [Line Items]
Gross loans			₨ 360,021.9
Fair value of credit substitutes			12,231.9
Non-funded exposure			61,224.3
Total Exposure			₨ 433,478.1
Iron and Steel | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.20%
Textiles & Garments
Concentration Risk [Line Items]
Gross loans			₨ 390,883.0
Fair value of credit substitutes			4,984.5
Non-funded exposure			34,729.1
Total Exposure			₨ 430,596.6
Textiles & Garments | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.20%
Telecom
Concentration Risk [Line Items]
Gross loans			₨ 365,112.3
Fair value of credit substitutes			0.0
Non-funded exposure			42,221.1
Total Exposure			₨ 407,333.4
Telecom | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.10%
Agri Production—Food
Concentration Risk [Line Items]
Gross loans			₨ 401,720.3
Fair value of credit substitutes			0.0
Non-funded exposure			1,040.5
Total Exposure			₨ 402,760.8
Agri Production—Food | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%			2.00%
Others (none greater than 2%)
Concentration Risk [Line Items]
Gross loans	₨ 9,184,195.4		₨ 3,490,386.3
Fair value of credit substitutes	61,578.3		92,104.1
Non-funded exposure	1,477,275.2		719,829.4
Total Exposure	₨ 10,723,048.9	$ 128,666.3	₨ 4,302,319.8
Others (none greater than 2%) | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	37.00%	37.00%	22.00%

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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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