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Summary of Gross Loans Origination and Internally Assigned Credit Risk Ratings (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2023
INR (₨)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
INR (₨)
Retail Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior ₨ 510,417.8 $ 6,210.2 ₨ 378,896.1
2018 320,947.2 3,904.9 259,729.3
2019 507,416.1 6,173.7 496,836.7
2020 775,037.4 9,429.8 808,003.9
2021 1,818,009.0 22,119.6 1,230,531.7
2022 3,600,410.4 43,806.0 3,233,675.4
Revolving Loans 3,658,893.5 44,517.5 2,560,650.4
Revolving loans converted to term loans 315,448.9 3,838.0 342,211.2
Total 11,506,580.3 139,999.7 9,310,534.7
Retail Loans | Auto loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 15,517.1   9,312.3
2018 39,749.6   45,501.4
2019 94,007.2   94,617.1
2020 163,319.0   175,929.5
2021 310,066.9   255,269.2
2022 526,442.7   455,776.3
Revolving Loans 71,995.1   6,387.2
Revolving loans converted to term loans 0.0   0.0
Total 1,221,097.6   1,042,793.0
Retail Loans | Personal loans/Credit card      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 2,778.0   1,576.1
2018 22,113.3   15,231.0
2019 89,549.8   71,661.5
2020 158,430.1   233,528.5
2021 494,010.7   340,457.8
2022 1,209,127.8   948,999.7
Revolving Loans 491,369.9   388,306.0
Revolving loans converted to term loans 315,448.9   342,211.2
Total 2,782,828.5   2,341,971.8
Retail Loans | Retail Business Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 80,434.7   56,009.1
2018 61,911.5   82,695.8
2019 97,219.4   100,790.9
2020 189,834.9   154,562.7
2021 413,863.3   309,553.8
2022 600,365.7   570,099.2
Revolving Loans 1,934,995.7   1,343,375.6
Revolving loans converted to term loans 0.0   0.0
Total 3,378,625.2   2,617,087.1
Retail Loans | Commercial vehicle and construction equipment finance      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 4,379.3   2,048.2
2018 22,200.6   17,414.0
2019 53,522.0   75,642.7
2020 97,469.8   133,233.7
2021 280,514.9   189,444.8
2022 630,169.3   427,085.4
Revolving Loans 197,631.9   106,197.2
Revolving loans converted to term loans 0.0   0.0
Total 1,285,887.8   951,066.0
Retail Loans | Housing loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 398,743.8   302,700.9
2018 161,654.0   86,186.2
2019 143,395.8   128,811.4
2020 120,395.0   48,992.2
2021 167,253.7   513.4
2022 29,459.3   263,678.3
Revolving Loans 0.0   0.0
Revolving loans converted to term loans 0.0   0.0
Total 1,020,901.6   830,882.4
Retail Loans | Other Retail      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 8,564.9   7,249.5
2018 13,318.2   12,700.9
2019 29,721.9   25,313.1
2020 45,588.6   61,757.3
2021 152,299.5   135,292.7
2022 604,845.6   568,036.5
Revolving Loans 962,900.9   716,384.4
Revolving loans converted to term loans 0.0   0.0
Total 1,817,239.6   1,526,734.4
Retail Loans | Performing | Auto loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 14,387.2   8,466.2
2018 37,425.2   42,634.8
2019 90,148.4   89,161.9
2020 160,443.6   169,606.1
2021 308,076.9   252,295.7
2022 525,693.8   455,114.6
Revolving Loans 68,980.9   5,072.1
Revolving loans converted to term loans 0.0   0.0
Total 1,205,156.0   1,022,351.4
Retail Loans | Performing | Personal loans/Credit card      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 2,431.4   1,374.4
2018 20,673.2   14,320.8
2019 86,038.7   67,477.1
2020 155,911.2   225,561.4
2021 490,598.8   336,526.1
2022 1,206,873.5   947,277.0
Revolving Loans 482,500.3   381,900.4
Revolving loans converted to term loans 315,031.3   339,477.1
Total 2,760,058.4   2,313,914.3
Retail Loans | Performing | Retail Business Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 75,583.1   52,347.2
2018 58,914.7   78,959.8
2019 94,372.2   97,361.4
2020 185,698.6   151,964.0
2021 412,305.0   306,673.0
2022 600,147.3   569,687.0
Revolving Loans 1,907,666.5   1,324,274.5
Revolving loans converted to term loans 0.0   0.0
Total 3,334,687.4   2,581,266.9
Retail Loans | Performing | Commercial vehicle and construction equipment finance      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 3,981.3   1,837.4
2018 19,618.5   16,022.5
2019 49,030.6   69,418.2
2020 92,773.8   125,223.1
2021 277,461.6   185,561.0
2022 629,405.5   426,434.1
Revolving Loans 191,792.7   101,478.2
Revolving loans converted to term loans 0.0   0.0
Total 1,264,064.0   925,974.5
Retail Loans | Performing | Housing loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 394,712.3   301,103.3
2018 160,447.9   85,682.1
2019 143,037.0   127,339.2
2020 120,214.8   46,798.3
2021 167,130.4   0.6
2022 29,458.9   263,480.5
Revolving Loans 0.0   0.0
Revolving loans converted to term loans 0.0   0.0
Total 1,015,001.3   824,404.0
Retail Loans | Performing | Other Retail      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 5,564.3   4,260.4
2018 10,063.3   11,266.3
2019 18,382.0   20,843.1
2020 42,416.7   51,074.6
2021 150,038.1   131,647.7
2022 603,873.8   567,032.4
Revolving Loans 930,078.5   691,150.7
Revolving loans converted to term loans 0.0   0.0
Total 1,760,416.7   1,477,275.2
Retail Loans | Non-performing | Auto loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 1,129.9   846.1
2018 2,324.4   2,866.6
2019 3,858.8   5,455.2
2020 2,875.4   6,323.4
2021 1,990.0   2,973.5
2022 748.9   661.7
Revolving Loans 3,014.2   1,315.1
Revolving loans converted to term loans 0.0   0.0
Total 15,941.6   20,441.6
Retail Loans | Non-performing | Personal loans/Credit card      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 346.6   201.7
2018 1,440.1   910.2
2019 3,511.1   4,184.4
2020 2,518.9   7,967.1
2021 3,411.9   3,931.7
2022 2,254.3   1,722.7
Revolving Loans 8,869.6   6,405.6
Revolving loans converted to term loans 417.6   2,734.1
Total 22,770.1   28,057.5
Retail Loans | Non-performing | Retail Business Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 4,851.6   3,661.9
2018 2,996.8   3,736.0
2019 2,847.2   3,429.5
2020 4,136.3   2,598.7
2021 1,558.3   2,880.8
2022 218.4   412.2
Revolving Loans 27,329.2   19,101.1
Revolving loans converted to term loans 0.0   0.0
Total 43,937.8   35,820.2
Retail Loans | Non-performing | Commercial vehicle and construction equipment finance      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 398.0   210.8
2018 2,582.1   1,391.5
2019 4,491.4   6,224.5
2020 4,696.0   8,010.6
2021 3,053.3   3,883.8
2022 763.8   651.3
Revolving Loans 5,839.2   4,719.0
Revolving loans converted to term loans 0.0   0.0
Total 21,823.8   25,091.5
Retail Loans | Non-performing | Housing loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 4,031.5   1,597.6
2018 1,206.1   504.1
2019 358.8   1,472.2
2020 180.2   2,193.9
2021 123.3   512.8
2022 0.4   197.8
Revolving Loans 0.0   0.0
Revolving loans converted to term loans 0.0   0.0
Total 5,900.3   6,478.4
Retail Loans | Non-performing | Other Retail      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 3,000.6   2,989.1
2018 3,254.9   1,434.6
2019 11,339.9   4,470.0
2020 3,171.9   10,682.7
2021 2,261.4   3,645.0
2022 971.8   1,004.1
Revolving Loans 32,822.4   25,233.7
Revolving loans converted to term loans     0.0
Total 56,822.9   49,459.2
Wholesale loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 137,178.9 1,669.0 5,859.4
2018 138,901.5 1,690.0 194,108.7
2019 321,892.8 3,916.4 206,701.5
2020 712,836.2 8,673.0 423,342.8
2021 1,257,010.8 15,294.0 1,011,211.4
2022 1,472,089.3 17,910.8 2,245,121.3
Revolving Loans 1,871,602.6 22,771.7 1,012,664.2
Total 5,911,512.1 $ 71,925.0 5,099,009.3
Wholesale loans | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 130,723.1   5,289.7
2018 135,400.3   186,145.4
2019 321,191.0   195,703.7
2020 708,309.0   421,349.1
2021 1,244,766.9   1,006,687.4
2022 1,471,254.9   2,232,372.3
Revolving Loans 1,841,015.5   984,145.8
Total 5,852,660.7   5,031,693.4
Wholesale loans | Labelled      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 2,625.3   0.0
2018 1,586.9   3,297.2
2019 635.7   5,164.1
2020 4,200.8   1,632.6
2021 5,946.5   4,045.0
2022 795.3   11,447.4
Revolving Loans 9,548.6   9,808.5
Total 25,339.1   35,394.8
Wholesale loans | Non-performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 3,830.5   569.7
2018 1,914.3   4,666.1
2019 66.1   5,833.7
2020 326.4   361.1
2021 6,297.4   479.0
2022 39.1   1,301.6
Revolving Loans 21,038.5   18,709.9
Total ₨ 33,512.3   ₨ 31,921.1