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Schedule IV - Reinsurance | 12 Months Ended
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Dec. 31, 2025
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] |
Reinsurance | SCHEDULE IV ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES REINSURANCE (U.S. dollars in millions)
| Gross Amount |  | Ceded to Other Companies (1) |  | Assumed From Other Companies (1) |  | Net Amount |  | Percentage of Amount Assumed to Net
Year Ended December 31, 2025 |  |  |  |  |  |  |  |  |
Premiums Written: |  |  |  |  |  |  |  |  |
Insurance | $ | 8,268 |  |  | $ | (2,637) |  |  | $ | 2,167 |  |  | $ | 7,798 |  |  | 27.8 | %
Reinsurance | 895 |  |  | (3,531) |  |  | 10,254 |  |  | 7,618 |  |  | 134.6 | %
Mortgage | 1,087 |  |  | (245) |  |  | 218 |  |  | 1,060 |  |  | 20.6 | %
Total | $ | 10,250 |  |  | $ | (6,402) |  |  | $ | 12,628 |  |  | $ | 16,476 |  |  | 76.6 | %
Year Ended December 31, 2024 |  |  |  |  |  |  |  |  |
Premiums Written: |  |  |  |  |  |  |  |  |
Insurance | $ | 7,970 |  |  | $ | (2,179) |  |  | $ | 1,083 |  |  | $ | 6,874 |  |  | 15.8 | %
Reinsurance | 956 |  |  | (3,366) |  |  | 10,156 |  |  | 7,746 |  |  | 131.1 | %
Mortgage | 1,130 |  |  | (239) |  |  | 221 |  |  | 1,112 |  |  | 19.9 | %
Total | $ | 10,056 |  |  | $ | (5,779) |  |  | $ | 11,455 |  |  | $ | 15,732 |  |  | 72.8 | %
Year Ended December 31, 2023 |  |  |  |  |  |  |  |  |
Premiums Written: |  |  |  |  |  |  |  |  |
Insurance | $ | 7,865 |  |  | $ | (2,049) |  |  | $ | 46 |  |  | $ | 5,862 |  |  | 0.8 | %
Reinsurance | 626 |  |  | (2,559) |  |  | 8,487 |  |  | 6,554 |  |  | 129.5 | %
Mortgage | 1,161 |  |  | (335) |  |  | 226 |  |  | 1,052 |  |  | 21.5 | %
Total | $ | 9,652 |  |  | $ | (4,935) |  |  | $ | 8,751 |  |  | $ | 13,468 |  |  | 65.0 | %
(1) Certain amounts included in the gross premiums written of each segment are related to intersegment transactions and are included in the gross premiums written of each segment. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

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- Definition The entire disclosure for the supplemental schedule of reinsurance information. Reinsurance schedule includes, but is not limited to, the type of insurance, gross amount of premiums, premiums ceded to other entities, premiums assumed from other entities, net amount of premium revenue, and the percentage of the premiums assumed to net premium revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 17 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-2 + Details
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