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Summary of Gross Loans Origination and Internally Assigned Credit Risk Ratings (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2022
INR (₨)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
INR (₨)
Retail Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior ₨ 378,896.1 $ 4,994.0 ₨ 325,017.0
2017 259,729.3 3,423.3 223,465.6
2018 496,836.7 6,548.5 460,687.0
2019 808,003.9 10,649.8 875,535.7
2020 1,230,531.7 16,218.9 1,399,092.4
2021 3,233,675.4 42,621.3 2,258,375.6
Revolving Loans 2,560,650.4 33,750.5 1,961,778.3
Revolving loans converted to term loans 342,211.2 4,510.5 324,881.0
Total 9,310,534.7 122,716.9 7,828,832.6
Retail Loans | Auto loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 9,312.3   5,335.9
2017 45,501.4   32,241.1
2018 94,617.1   105,207.5
2019 175,929.5   177,420.0
2020 255,269.2   274,790.0
2021 455,776.3   363,780.1
Revolving Loans 6,387.2   5,278.6
Revolving loans converted to term loans 0.0   0.0
Total 1,042,793.0   964,053.2
Retail Loans | Personal loans/Credit card      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 1,576.1   732.4
2017 15,231.0   9,218.8
2018 71,661.5   51,802.5
2019 233,528.5   187,236.5
2020 340,457.8   495,307.5
2021 948,999.7   639,169.9
Revolving Loans 388,306.0   334,378.6
Revolving loans converted to term loans 342,211.2   324,881.0
Total 2,341,971.8   2,042,727.2
Retail Loans | Retail Business Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 56,009.1   38,773.6
2017 82,695.8   52,290.8
2018 100,790.9   126,526.8
2019 154,562.7   149,339.8
2020 309,553.8   211,462.3
2021 570,099.2   481,571.6
Revolving Loans 1,343,375.6   947,881.0
Revolving loans converted to term loans 0.0   0.0
Total 2,617,087.1   2,007,845.9
Retail Loans | Commercial vehicle and construction equipment finance      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 2,048.2   673.7
2017 17,414.0   7,128.8
2018 75,642.7   49,163.8
2019 133,233.7   157,544.7
2020 189,444.8   224,501.8
2021 427,085.4   289,039.2
Revolving Loans 106,197.2   77,277.8
Revolving loans converted to term loans 0.0   0.0
Total 951,066.0   805,329.8
Retail Loans | Housing loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 302,700.9   274,468.7
2017 86,186.2   112,841.5
2018 128,811.4   105,813.9
2019 48,992.2   153,430.6
2020 513.4   55,641.9
2021 263,678.3   38.9
Revolving Loans 0.0   0.0
Revolving loans converted to term loans 0.0   0.0
Total 830,882.4   702,235.5
Retail Loans | Other Retail      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 7,249.5   5,032.7
2017 12,700.9   9,744.6
2018 25,313.1   22,172.5
2019 61,757.3   50,564.1
2020 135,292.7   137,388.9
2021 568,036.5   484,775.9
Revolving Loans 716,384.4   596,962.3
Revolving loans converted to term loans 0.0   0.0
Total 1,526,734.4   1,306,641.0
Retail Loans | Performing | Auto loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 8,466.2   4,599.0
2017 42,634.8   30,174.9
2018 89,161.9   99,159.5
2019 169,606.1   168,159.1
2020 252,295.7   266,277.0
2021 455,114.6   362,747.1
Revolving Loans 5,072.1   4,460.3
Revolving loans converted to term loans 0.0   0.0
Total 1,022,351.4   935,576.9
Retail Loans | Performing | Personal loans/Credit card      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 1,374.4   613.8
2017 14,320.8   8,617.1
2018 67,477.1   48,658.4
2019 225,561.4   178,532.3
2020 336,526.1   483,925.8
2021 947,277.0   638,007.4
Revolving Loans 381,900.4   326,118.9
Revolving loans converted to term loans 339,477.1   321,227.4
Total 2,313,914.3   2,005,701.1
Retail Loans | Performing | Retail Business Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 52,347.2   35,189.0
2017 78,959.8   49,573.1
2018 97,361.4   121,663.7
2019 151,964.0   145,473.9
2020 306,673.0   209,578.9
2021 569,687.0   480,518.2
Revolving Loans 1,324,274.5   934,520.2
Revolving loans converted to term loans 0.0   0.0
Total 2,581,266.9   1,976,517.0
Retail Loans | Performing | Commercial vehicle and construction equipment finance      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 1,837.4   517.8
2017 16,022.5   6,292.2
2018 69,418.2   44,766.4
2019 125,223.1   146,432.4
2020 185,561.0   214,342.4
2021 426,434.1   287,953.1
Revolving Loans 101,478.2   73,010.2
Revolving loans converted to term loans 0.0   0.0
Total 925,974.5   773,314.5
Retail Loans | Performing | Housing loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 301,103.3   272,061.4
2017 85,682.1   111,758.9
2018 127,339.2   105,069.4
2019 46,798.3   152,564.7
2020 0.6   55,570.3
2021 263,480.5   38.9
Revolving Loans 0.0   0.0
Revolving loans converted to term loans 0.0   0.0
Total 824,404.0   697,063.6
Retail Loans | Performing | Other Retail      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 4,260.4   2,406.7
2017 11,266.3   8,530.0
2018 20,843.1   20,090.5
2019 51,074.6   45,854.0
2020 131,647.7   129,946.8
2021 567,032.4   483,241.9
Revolving Loans 691,150.7   576,986.7
Revolving loans converted to term loans 0.0   0.0
Total 1,477,275.2   1,267,056.6
Retail Loans | Non-performing | Auto loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 846.1   736.9
2017 2,866.6   2,066.2
2018 5,455.2   6,048.0
2019 6,323.4   9,260.9
2020 2,973.5   8,513.0
2021 661.7   1,033.0
Revolving Loans 1,315.1   818.3
Revolving loans converted to term loans 0.0   0.0
Total 20,441.6   28,476.3
Retail Loans | Non-performing | Personal loans/Credit card      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 201.7   118.6
2017 910.2   601.7
2018 4,184.4   3,144.1
2019 7,967.1   8,704.2
2020 3,931.7   11,381.7
2021 1,722.7   1,162.5
Revolving Loans 6,405.6   8,259.7
Revolving loans converted to term loans 2,734.1   3,653.6
Total 28,057.5   37,026.1
Retail Loans | Non-performing | Retail Business Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 3,661.9   3,584.6
2017 3,736.0   2,717.7
2018 3,429.5   4,863.1
2019 2,598.7   3,865.9
2020 2,880.8   1,883.4
2021 412.2   1,053.4
Revolving Loans 19,101.1   13,360.8
Revolving loans converted to term loans 0.0   0.0
Total 35,820.2   31,328.9
Retail Loans | Non-performing | Commercial vehicle and construction equipment finance      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 210.8   155.9
2017 1,391.5   836.6
2018 6,224.5   4,397.4
2019 8,010.6   11,112.3
2020 3,883.8   10,159.4
2021 651.3   1,086.1
Revolving Loans 4,719.0   4,267.6
Revolving loans converted to term loans 0.0   0.0
Total 25,091.5   32,015.3
Retail Loans | Non-performing | Housing loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 1,597.6   2,407.3
2017 504.1   1,082.6
2018 1,472.2   744.5
2019 2,193.9   865.9
2020 512.8   71.6
2021 197.8   0.0
Revolving Loans 0.0   0.0
Revolving loans converted to term loans 0.0   0.0
Total 6,478.4   5,171.9
Retail Loans | Non-performing | Other Retail      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 2,989.1   2,626.0
2017 1,434.6   1,214.6
2018 4,470.0   2,082.0
2019 10,682.7   4,710.1
2020 3,645.0   7,442.1
2021 1,004.1   1,534.0
Revolving Loans 25,233.7   19,975.6
Revolving loans converted to term loans 0.0   0.0
Total 49,459.2   39,584.4
Wholesale loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 5,859.4 77.2 4,385.2
2017 194,108.7 2,558.4 3,416.6
2018 206,701.5 2,724.4 317,027.8
2019 423,342.8 5,579.8 339,789.6
2020 1,011,211.4 13,328.2 572,780.0
2021 2,245,121.3 29,591.7 2,013,535.3
Revolving Loans 1,012,664.2 13,347.4 963,950.8
Total 5,099,009.3 $ 67,207.2 4,214,885.3
Wholesale loans | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 5,289.7   3,939.4
2017 186,145.4   3,332.3
2018 195,703.7   298,631.5
2019 421,349.1   324,816.0
2020 1,006,687.4   568,907.1
2021 2,232,372.3   2,007,206.0
Revolving Loans 984,145.8   930,417.0
Total 5,031,693.4   4,137,249.3
Wholesale loans | Labelled      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 0.0   0.0
2017 3,297.2   0.0
2018 5,164.1   7,503.2
2019 1,632.6   10,194.9
2020 4,045.0   2,427.6
2021 11,447.4   4,073.6
Revolving Loans 9,808.5   13,257.2
Total 35,394.8   37,456.5
Wholesale loans | Non-performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 569.7   445.8
2017 4,666.1   84.3
2018 5,833.7   10,893.1
2019 361.1   4,778.7
2020 479.0   1,445.3
2021 1,301.6   2,255.7
Revolving Loans 18,709.9   20,276.6
Total ₨ 31,921.1   ₨ 40,179.5