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Debt and Financing Arrangements - (Tables) | 12 Months Ended
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Dec. 31, 2025
Debt Disclosure [Abstract] |
Schedule of senior notes | The Company’s senior notes payable at December 31, 2025 and 2024 were as follows:
|  |  |  |  |  | Carrying Amount at
|  | Interest |  | Principal |  | December 31,
|  | (Fixed) |  | Amount |  | 2025 |  | 2024
2034 notes (1) |  | 7.350 | % |  | $ | 300 |  |  | $ | 298 |  |  | $ | 298 |
2043 notes (2) |  | 5.144 | % |  | 500 |  |  | 496 |  |  | 496 |
2026 notes (3) |  | 4.011 | % |  | 500 |  |  | 499 |  |  | 499 |
2046 notes (4) |  | 5.031 | % |  | 450 |  |  | 446 |  |  | 446 |
2050 notes (5) |  | 3.635 | % |  | 1,000 |  |  | 990 |  |  | 989 |
|  |  |  | $ | 2,750 |  |  | $ | 2,729 |  |  | $ | 2,728 |
(1) Senior notes of Arch Capital issued on May 4, 2004 and due May 1, 2034 (“2034 notes”). (2) Senior notes of Arch-U.S., a wholly-owned subsidiary of Arch Capital, issued on December 13, 2013 and due November 1, 2043 (“2043 notes”), fully and unconditionally guaranteed by Arch Capital. (3) Senior notes of Arch Capital Finance LLC (“Arch Finance”), a wholly-owned finance subsidiary of Arch Capital, issued on December 8, 2016 and due December 15, 2026 (“2026 notes”), fully and unconditionally guaranteed by Arch Capital. (4) Senior notes of Arch Finance issued on December 8, 2016 and due December 15, 2046 (“2046 notes”), fully and unconditionally guaranteed by Arch Capital (5) Senior notes of Arch Capital issued on June 30, 2020 and due June 30, 2050 (“2050 notes”).

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