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Schedule VI - Supplementary Information For Property and Casualty Insurance Underwriters | 12 Months Ended
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Dec. 31, 2025
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract] |
Supplementary Information for Property and Casualty Insurance Underwriters | SCHEDULE VI ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES SUPPLEMENTARY INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS (U.S. dollars in millions)
Column A | Column B | Column C | Column D | Column E | Column F | Column G | Column H | Column I | Column J | Column K
Affiliation with Registrant | Deferred Acquisition Costs | Reserves for Losses and Loss Adjustment Expenses | Discount, if any, deducted in Column C | Unearned Premiums | Net Premiums Earned | Net Investment Income | Net Losses and Loss Adjustment Expenses Incurred Related to | Amortization of Deferred Acquisition Costs | Net Paid Losses and Loss Adjustment Expenses | Net Premiums Written
(a) Current Year | (b) Prior Years
Consolidated Subsidiaries |  |  |  |  |  |  |  |  |
2025 | $ | 1,717 |  | $ | 33,547 |  | $ | 78 |  | $ | 10,100 |  | $ | 17,065 |  | $ | 1,625 |  | $ | 9,970 |  | $ | (600) |  | $ | 3,153 |  | $ | 7,025 |  | $ | 16,476 |
2024 | 1,734 |  | 29,369 |  | 68 |  | 10,218 |  | 15,100 |  | 1,495 |  | 8,849 |  | (507) |  | 2,651 |  | 5,073 |  | 15,732 |
2023 | 1,531 |  | 22,752 |  | 66 |  | 8,808 |  | 12,440 |  | 1,023 |  | 6,784 |  | (538) |  | 2,312 |  | 4,093 |  | 13,468 |

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- Definition The entire disclosure of supplemental information for registrant, its subsidiary and 50-percent-or-less-owned equity basis investee, with liability for property-casualty insurance claim. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 18 -Paragraph Column A -Subparagraph (c) -Footnote 3 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 18 -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column A)(c)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-3 + Details
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