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Loans - Allowance for Credit Losses (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
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Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨) | Mar. 31, 2023 INR (₨) | Mar. 31, 2025 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses, beginning of the period | ₨ 457,346.5 |  | $ 5,353.4 |  | ₨ 365,164.5 |  | ₨ 372,671.8 |  |
Allowance for credit losses on PCD Loans at acquisition | 0.0 |  | 0.0 |  | 39,415.2 |  |  |  |
Write-offs | (149,389.6) |  | (1,748.7) |  | (128,987.2) |  | (137,863.7) |  |
Net allowance for credit losses | 227,872.4 | [1] | 2,667.4 | [1] | 181,754.0 | [1] | 130,356.4 | [2] |
Allowance for credit losses, end of the period | 535,829.3 |  | $ 6,272.1 |  | 457,346.5 |  | 365,164.5 |  |
Allowance for credit losses: |  |  |  |  |  |  |  |  |
Allowance individually evaluated for impairment | 61,894.0 |  |  |  | 71,735.4 |  | 31,696.6 |  | $ 724.5
Allowance collectively evaluated for impairment | 473,935.3 |  |  |  | 385,611.1 |  | 333,467.9 |  | 5,547.6
Loans: |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 94,500.6 |  |  |  | 110,714.5 |  | 37,061.8 |  | 1,106.2
Loans collectively evaluated for impairment | 28,544,310.5 |  |  |  | 26,682,332.9 |  | 17,381,030.6 |  | $ 334,125.1
Auto loans |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses, beginning of the period | 29,948.9 |  |  |  | 33,835.5 |  | 41,769.4 |  |
Allowance for credit losses on PCD Loans at acquisition | 0.0 |  |  |  | 0.0 |  |  |  |
Write-offs | (9,586.7) |  |  |  | (8,648.1) |  | (10,456.0) |  |
Net allowance for credit losses | 17,085.4 | [1] |  |  | 4,761.5 | [1] | 2,522.1 | [2] |
Allowance for credit losses, end of the period | 37,447.6 |  |  |  | 29,948.9 |  | 33,835.5 |  |
Allowance for credit losses: |  |  |  |  |  |  |  |  |
Allowance individually evaluated for impairment | 3.0 |  |  |  | 8.0 |  | 4.6 |  |
Allowance collectively evaluated for impairment | 37,444.6 |  |  |  | 29,940.9 |  | 33,830.9 |  |
Loans: |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 3.5 |  |  |  | 8.0 |  | 16.4 |  |
Loans collectively evaluated for impairment | 1,550,903.9 |  |  |  | 1,378,515.1 |  | 1,221,081.2 |  |
Personal loans/Credit card |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses, beginning of the period | 116,999.6 |  |  |  | 99,634.4 |  | 111,566.4 |  |
Allowance for credit losses on PCD Loans at acquisition | 0.0 |  |  |  | 0.0 |  |  |  |
Write-offs | (95,746.2) |  |  |  | (74,794.1) |  | (88,744.9) |  |
Net allowance for credit losses | 114,516.3 | [1] |  |  | 92,159.3 | [1] | 76,812.9 | [2] |
Allowance for credit losses, end of the period | 135,769.7 |  |  |  | 116,999.6 |  | 99,634.4 |  |
Allowance for credit losses: |  |  |  |  |  |  |  |  |
Allowance individually evaluated for impairment | 0.0 |  |  |  | 1.0 |  | 0.0 |  |
Allowance collectively evaluated for impairment | 135,769.7 |  |  |  | 116,998.6 |  | 99,634.4 |  |
Loans: |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 0.0 |  |  |  | 1.0 |  | 0.8 |  |
Loans collectively evaluated for impairment | 3,426,193.3 |  |  |  | 3,119,245.7 |  | 2,782,827.7 |  |
Retail business banking |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses, beginning of the period | 75,300.5 |  |  |  | 63,974.8 |  | 49,055.0 |  |
Allowance for credit losses on PCD Loans at acquisition | 0.0 |  |  |  | 0.0 |  |  |  |
Write-offs | (2,061.0) |  |  |  | (1,630.1) |  | (3,987.8) |  |
Net allowance for credit losses | 24,429.6 | [1] |  |  | 12,955.8 | [1] | 18,907.6 | [2] |
Allowance for credit losses, end of the period | 97,669.1 |  |  |  | 75,300.5 |  | 63,974.8 |  |
Allowance for credit losses: |  |  |  |  |  |  |  |  |
Allowance individually evaluated for impairment | 2,691.1 |  |  |  | 2,498.3 |  | 2,320.3 |  |
Allowance collectively evaluated for impairment | 94,978.0 |  |  |  | 72,802.2 |  | 61,654.5 |  |
Loans: |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 3,087.8 |  |  |  | 2,924.9 |  | 2,782.0 |  |
Loans collectively evaluated for impairment | 4,964,602.2 |  |  |  | 4,204,911.3 |  | 3,375,843.2 |  |
Commercial vehicle and construction equipment finance |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses, beginning of the period | 32,096.1 |  |  |  | 31,130.6 |  | 31,750.9 |  |
Allowance for credit losses on PCD Loans at acquisition | 0.0 |  |  |  | 0.0 |  |  |  |
Write-offs | (14,270.3) |  |  |  | (9,796.1) |  | (15,270.1) |  |
Net allowance for credit losses | 20,223.4 | [1] |  |  | 10,761.6 | [1] | 14,649.8 | [2] |
Allowance for credit losses, end of the period | 38,049.2 |  |  |  | 32,096.1 |  | 31,130.6 |  |
Allowance for credit losses: |  |  |  |  |  |  |  |  |
Allowance individually evaluated for impairment | 281.1 |  |  |  | 184.4 |  | 15.0 |  |
Allowance collectively evaluated for impairment | 37,768.1 |  |  |  | 31,911.7 |  | 31,115.6 |  |
Loans: |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 426.5 |  |  |  | 184.4 |  | 290.8 |  |
Loans collectively evaluated for impairment | 1,861,767.1 |  |  |  | 1,619,418.5 |  | 1,285,597.0 |  |
Housing loans |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses, beginning of the period | 9,906.8 |  |  |  | 3,269.9 |  | 2,692.2 |  |
Allowance for credit losses on PCD Loans at acquisition | 0.0 |  |  |  | 2,927.9 |  |  |  |
Write-offs | (3,676.7) |  |  |  | (12,013.2) |  | (479.0) |  |
Net allowance for credit losses | 9,290.8 | [1] |  |  | 15,722.2 | [1] | 1,056.7 | [2] |
Allowance for credit losses, end of the period | 15,520.9 |  |  |  | 9,906.8 |  | 3,269.9 |  |
Allowance for credit losses: |  |  |  |  |  |  |  |  |
Allowance individually evaluated for impairment | 0.6 |  |  |  | 0.0 |  | 0.0 |  |
Allowance collectively evaluated for impairment | 15,520.3 |  |  |  | 9,906.8 |  | 3,269.9 |  |
Loans: |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 1.9 |  |  |  | 0.0 |  | 0.0 |  |
Loans collectively evaluated for impairment | 7,141,177.1 |  |  |  | 6,993,168.0 |  | 1,020,901.6 |  |
Other retail |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses, beginning of the period | 80,453.8 |  |  |  | 72,012.4 |  | 61,437.0 |  |
Allowance for credit losses on PCD Loans at acquisition | 0.0 |  |  |  | 0.0 |  |  |  |
Write-offs | (19,849.5) |  |  |  | (18,530.4) |  | (15,769.9) |  |
Net allowance for credit losses | 51,078.2 | [1] |  |  | 26,971.8 | [1] | 26,345.3 | [2] |
Allowance for credit losses, end of the period | 111,682.5 |  |  |  | 80,453.8 |  | 72,012.4 |  |
Allowance for credit losses: |  |  |  |  |  |  |  |  |
Allowance individually evaluated for impairment | 532.7 |  |  |  | 156.8 |  | 92.1 |  |
Allowance collectively evaluated for impairment | 111,149.8 |  |  |  | 80,297.0 |  | 71,920.3 |  |
Loans: |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 533.4 |  |  |  | 156.8 |  | 92.3 |  |
Loans collectively evaluated for impairment | 2,582,868.7 |  |  |  | 2,271,874.4 |  | 1,817,147.3 |  |
Wholesale loans |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses, beginning of the period | 112,640.8 |  |  |  | 61,306.9 |  | 74,400.9 |  |
Allowance for credit losses on PCD Loans at acquisition | 0.0 |  |  |  | 36,487.3 |  |  |  |
Write-offs | (4,199.2) |  |  |  | (3,575.2) |  | (3,156.0) |  |
Net allowance for credit losses | (8,751.3) | [1] |  |  | 18,421.8 | [1] | (9,938.0) | [2] |
Allowance for credit losses, end of the period | 99,690.3 |  |  |  | 112,640.8 |  | 61,306.9 |  |
Allowance for credit losses: |  |  |  |  |  |  |  |  |
Allowance individually evaluated for impairment | 58,385.5 |  |  |  | 68,886.9 |  | 29,264.6 |  |
Allowance collectively evaluated for impairment | 41,304.8 |  |  |  | 43,753.9 |  | 32,042.3 |  |
Loans: |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 90,447.5 |  |  |  | 107,439.4 |  | 33,879.5 |  |
Loans collectively evaluated for impairment | ₨ 7,016,798.2 |  |  |  | ₨ 7,095,199.9 |  | ₨ 5,877,632.6 |  |
[1] | Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs. 46,446.6 million (US$ 543.8 million). Recoveries from retail loans is Rs. 215.4 million and from wholesale loans is Rs. 41,506.6 million.
[2] | Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs.36,181.4 million. Recoveries from retail loans is Rs.35,385.3 million and from wholesale loans is Rs.796.1 million.

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