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Summary of Gross Loans Origination and Internally Assigned Credit Risk Ratings (Detail) - Mar. 31, 2021
₨ in Millions, $ in Millions
INR (₨)
USD ($)
Retail Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior ₨ 325,017.0 $ 4,443.8
2017 223,465.6 3,055.3
2018 460,687.0 6,298.7
2019 875,535.7 11,970.7
2020 1,399,092.4 19,129.0
2021 2,258,375.6 30,877.4
Revolving Loans 1,961,778.3 26,822.2
Revolving loans converted to term loans 324,881.0 4,441.9
Total 7,828,832.6 107,039.0
Retail Loans | Auto loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 5,335.9  
2017 32,241.1  
2018 105,207.5  
2019 177,420.0  
2020 274,790.0  
2021 363,780.1  
Revolving Loans 5,278.6  
Revolving loans converted to term loans 0.0  
Total 964,053.2  
Retail Loans | Personal loans/Credit card    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 732.4  
2017 9,218.8  
2018 51,802.5  
2019 187,236.5  
2020 495,307.5  
2021 639,169.9  
Revolving Loans 334,378.6  
Revolving loans converted to term loans 324,881.0  
Total 2,042,727.2  
Retail Loans | Retail Business Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 38,773.6  
2017 52,290.8  
2018 126,526.8  
2019 149,339.8  
2020 211,462.3  
2021 481,571.6  
Revolving Loans 947,881.0  
Revolving loans converted to term loans 0.0  
Total 2,007,845.9  
Retail Loans | Commercial vehicle and construction equipment finance    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 673.7  
2017 7,128.8  
2018 49,163.8  
2019 157,544.7  
2020 224,501.8  
2021 289,039.2  
Revolving Loans 77,277.8  
Revolving loans converted to term loans 0.0  
Total 805,329.8  
Retail Loans | Housing loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 274,468.7  
2017 112,841.5  
2018 105,813.9  
2019 153,430.6  
2020 55,641.9  
2021 38.9  
Revolving Loans 0.0  
Revolving loans converted to term loans 0.0  
Total 702,235.5  
Retail Loans | Other Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 5,032.7  
2017 9,744.6  
2018 22,172.5  
2019 50,564.1  
2020 137,388.9  
2021 484,775.9  
Revolving Loans 596,962.3  
Revolving loans converted to term loans 0.0  
Total 1,306,641.0  
Retail Loans | Performing | Auto loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 4,599.0  
2017 30,174.9  
2018 99,159.5  
2019 168,159.1  
2020 266,277.0  
2021 362,747.1  
Revolving Loans 4,460.3  
Revolving loans converted to term loans 0.0  
Total 935,576.9  
Retail Loans | Performing | Personal loans/Credit card    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 613.8  
2017 8,617.1  
2018 48,658.4  
2019 178,532.3  
2020 483,925.8  
2021 638,007.4  
Revolving Loans 326,118.9  
Revolving loans converted to term loans 321,227.4  
Total 2,005,701.1  
Retail Loans | Performing | Retail Business Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 35,189.0  
2017 49,573.1  
2018 121,663.7  
2019 145,473.9  
2020 209,578.9  
2021 480,518.2  
Revolving Loans 934,520.2  
Revolving loans converted to term loans 0.0  
Total 1,976,517.0  
Retail Loans | Performing | Commercial vehicle and construction equipment finance    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 517.8  
2017 6,292.2  
2018 44,766.4  
2019 146,432.4  
2020 214,342.4  
2021 287,953.1  
Revolving Loans 73,010.2  
Revolving loans converted to term loans 0.0  
Total 773,314.5  
Retail Loans | Performing | Housing loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 272,061.4  
2017 111,758.9  
2018 105,069.4  
2019 152,564.7  
2020 55,570.3  
2021 38.9  
Revolving Loans 0.0  
Revolving loans converted to term loans 0.0  
Total 697,063.6  
Retail Loans | Performing | Other Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 2,406.7  
2017 8,530.0  
2018 20,090.5  
2019 45,854.0  
2020 129,946.8  
2021 483,241.9  
Revolving Loans 576,986.7  
Revolving loans converted to term loans 0.0  
Total 1,267,056.6  
Retail Loans | Non-performing | Auto loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 736.9  
2017 2,066.2  
2018 6,048.0  
2019 9,260.9  
2020 8,513.0  
2021 1,033.0  
Revolving Loans 818.3  
Revolving loans converted to term loans 0.0  
Total 28,476.3  
Retail Loans | Non-performing | Personal loans/Credit card    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 118.6  
2017 601.7  
2018 3,144.1  
2019 8,704.2  
2020 11,381.7  
2021 1,162.5  
Revolving Loans 8,259.7  
Revolving loans converted to term loans 3,653.6  
Total 37,026.1  
Retail Loans | Non-performing | Retail Business Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 3,584.6  
2017 2,717.7  
2018 4,863.1  
2019 3,865.9  
2020 1,883.4  
2021 1,053.4  
Revolving Loans 13,360.8  
Revolving loans converted to term loans 0.0  
Total 31,328.9  
Retail Loans | Non-performing | Commercial vehicle and construction equipment finance    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 155.9  
2017 836.6  
2018 4,397.4  
2019 11,112.3  
2020 10,159.4  
2021 1,086.1  
Revolving Loans 4,267.6  
Revolving loans converted to term loans 0.0  
Total 32,015.3  
Retail Loans | Non-performing | Housing loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 2,407.3  
2017 1,082.6  
2018 744.5  
2019 865.9  
2020 71.6  
2021 0.0  
Revolving Loans 0.0  
Revolving loans converted to term loans 0.0  
Total 5,171.9  
Retail Loans | Non-performing | Other Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 2,626.0  
2017 1,214.6  
2018 2,082.0  
2019 4,710.1  
2020 7,442.1  
2021 1,534.0  
Revolving Loans 19,975.6  
Revolving loans converted to term loans 0.0  
Total 39,584.4  
Wholesale loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 4,385.2 60.0
2017 3,416.6 46.7
2018 317,027.8 4,334.5
2019 339,789.6 4,645.7
2020 572,780.0 7,831.3
2021 2,013,535.3 27,529.9
Revolving Loans 963,950.8 13,179.6
Total 4,214,885.3 $ 57,627.7
Wholesale loans | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 3,939.4  
2017 3,332.3  
2018 298,631.5  
2019 324,816.0  
2020 568,907.1  
2021 2,007,206.0  
Revolving Loans 930,417.0  
Total 4,137,249.3  
Wholesale loans | Labelled    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 0.0  
2017 0.0  
2018 7,503.2  
2019 10,194.9  
2020 2,427.6  
2021 4,073.6  
Revolving Loans 13,257.2  
Total 37,456.5  
Wholesale loans | Non-performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 445.8  
2017 84.3  
2018 10,893.1  
2019 4,778.7  
2020 1,445.3  
2021 2,255.7  
Revolving Loans 20,276.6  
Total ₨ 40,179.5