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Concentrations of Credit Risk (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2015
INR (₨)
Mar. 31, 2014
INR (₨)
Mar. 31, 2015
USD ($)
Concentration Risk [Line Items]      
Gross loans ₨ 3,943,449.1 ₨ 3,228,261.3 $ 63,287.5
Fair Value Of Credit Substitutes 195,058.9 65,147.1  
Non-funded exposure 628,002.3 584,038.6  
Total Exposure ₨ 4,766,510.3 ₨ 3,877,447.0 76,496.9
Lender Concentration Risk      
Concentration Risk [Line Items]      
% 100.00% 100.00%  
Consumer Loans      
Concentration Risk [Line Items]      
Gross loans ₨ 479,467.5    
Fair Value Of Credit Substitutes 0.0    
Non-funded exposure 17.6    
Total Exposure ₨ 479,485.1   7,695.2
Consumer Loans | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 10.10%    
Activities allied to agriculture      
Concentration Risk [Line Items]      
Gross loans ₨ 422,894.4 ₨ 155,559.1  
Fair Value Of Credit Substitutes 0.0 0.0  
Non-funded exposure 1,697.6 562.2  
Total Exposure ₨ 424,592.0 ₨ 156,121.3 6,814.2
Activities allied to agriculture | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 8.90% 4.00%  
Wholesale Trade      
Concentration Risk [Line Items]      
Gross loans ₨ 308,806.4 ₨ 235,711.9  
Fair Value Of Credit Substitutes 5,259.8 99.9  
Non-funded exposure 31,745.5 26,849.8  
Total Exposure ₨ 345,811.7 ₨ 262,661.6 5,549.9
Wholesale Trade | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 7.30% 6.80%  
Services      
Concentration Risk [Line Items]      
Gross loans ₨ 230,040.6 ₨ 96,238.8  
Fair Value Of Credit Substitutes 445.9 341.8  
Non-funded exposure 15,511.7 17,496.5  
Total Exposure ₨ 245,998.2 ₨ 114,077.1 3,948.0
Services | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 5.20% 2.90%  
Automobile and Auto Ancillary      
Concentration Risk [Line Items]      
Gross loans ₨ 192,017.4 ₨ 145,886.7  
Fair Value Of Credit Substitutes 23,046.5 5,067.8  
Non-funded exposure 16,357.7 13,878.2  
Total Exposure ₨ 231,421.6 ₨ 164,832.7 3,714.0
Automobile and Auto Ancillary | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 4.90% 4.30%  
Retail Trade      
Concentration Risk [Line Items]      
Gross loans ₨ 189,593.5 ₨ 90,086.2  
Fair Value Of Credit Substitutes 841.2 0.0  
Non-funded exposure 4,761.4 3,121.6  
Total Exposure ₨ 195,196.1 ₨ 93,207.8 3,132.7
Retail Trade | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 4.10% 2.40%  
Coal & Petroleum Products      
Concentration Risk [Line Items]      
Gross loans ₨ 40,153.4 ₨ 69,725.4  
Fair Value Of Credit Substitutes 5,984.5 0.0  
Non-funded exposure 111,908.1 62,589.9  
Total Exposure ₨ 158,046.0 ₨ 132,315.3 2,536.4
Coal & Petroleum Products | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 3.30% 3.40%  
NBFC/Financial Intermediaries      
Concentration Risk [Line Items]      
Gross loans ₨ 94,744.7 ₨ 57,796.1  
Fair Value Of Credit Substitutes 59,985.8 23,196.9  
Non-funded exposure 1,876.5 2,217.1  
Total Exposure ₨ 156,607.0 ₨ 83,210.1 2,513.4
NBFC/Financial Intermediaries | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 3.30% 2.10%  
Food And Beverage      
Concentration Risk [Line Items]      
Gross loans ₨ 121,172.2 ₨ 99,588.0  
Fair Value Of Credit Substitutes 7,040.2 1,000.6  
Non-funded exposure 6,734.9 6,182.8  
Total Exposure ₨ 134,947.3 ₨ 106,771.4 2,165.7
Food And Beverage | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 2.80% 2.80%  
Land Transport      
Concentration Risk [Line Items]      
Gross loans ₨ 131,240.2 ₨ 150,177.4  
Fair Value Of Credit Substitutes 522.1 0.0  
Non-funded exposure 2,668.8 2,398.4  
Total Exposure ₨ 134,431.1 ₨ 152,575.8 2,157.5
Land Transport | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 2.80% 3.90%  
Power      
Concentration Risk [Line Items]      
Gross loans ₨ 96,169.7 ₨ 70,980.3  
Fair Value Of Credit Substitutes 15,846.8 1,489.4  
Non-funded exposure 18,570.3 14,572.6  
Total Exposure ₨ 130,586.8 ₨ 87,042.3 2,095.8
Power | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 2.70% 2.20%  
Engineering      
Concentration Risk [Line Items]      
Gross loans ₨ 79,747.2 ₨ 57,349.9  
Fair Value Of Credit Substitutes 1,077.1 0.0  
Non-funded exposure 48,819.8 38,982.2  
Total Exposure ₨ 129,644.1 ₨ 96,332.1 2,080.6
Engineering | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 2.70% 2.50%  
Real Estate & Property Services      
Concentration Risk [Line Items]      
Gross loans ₨ 88,264.9    
Fair Value Of Credit Substitutes 3,607.0    
Non-funded exposure 11,179.6    
Total Exposure ₨ 103,051.5   1,653.9
Real Estate & Property Services | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 2.20%    
Iron and Steel      
Concentration Risk [Line Items]      
Gross loans ₨ 84,913.9 ₨ 82,959.4  
Fair Value Of Credit Substitutes 1,475.8 2,323.8  
Non-funded exposure 15,927.1 19,958.0  
Total Exposure ₨ 102,316.8 ₨ 105,241.2 1,642.1
Iron and Steel | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 2.10% 2.70%  
Others (none greater than 2%)      
Concentration Risk [Line Items]      
Gross loans ₨ 1,384,223.1 ₨ 1,897,191.4  
Fair Value Of Credit Substitutes 69,926.2 31,626.9  
Non-funded exposure 340,225.7 245,854.3  
Total Exposure ₨ 1,794,375.0 ₨ 2,174,672.6 $ 28,797.5
Others (none greater than 2%) | Lender Concentration Risk      
Concentration Risk [Line Items]      
% 37.60% 56.20%  
Banks and Financial Institutions      
Concentration Risk [Line Items]      
Gross loans   ₨ 19,010.7  
Fair Value Of Credit Substitutes   0.0  
Non-funded exposure   129,375.0  
Total Exposure   ₨ 148,385.7  
Banks and Financial Institutions | Lender Concentration Risk      
Concentration Risk [Line Items]      
%   3.80%