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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 ($)
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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 |

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