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Schedule VI - Supplementary Information For Property and Casualty Insurance Underwriters
 12 Months Ended
Dec. 31, 2024
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 AColumn BColumn CColumn DColumn EColumn FColumn GColumn HColumn IColumn JColumn K
Affiliation with RegistrantDeferred Acquisition CostsReserves for Losses and Loss Adjustment ExpensesDiscount, if any, deducted in Column CUnearned PremiumsNet
Premiums Earned		Net Investment IncomeNet Losses and Loss Adjustment Expenses Incurred Related toAmortization
of Deferred Acquisition Costs		Net Paid Losses and Loss Adjustment ExpensesNet
Premiums Written
(a) Current Year(b)
Prior Years
Consolidated Subsidiaries
2024$1,734 $29,369 $68 $10,218 $15,100 $1,495 $8,849 $(507)$2,651 $5,073 $15,732 
20231,531 22,752 66 8,808 12,440 1,023 6,784 (538)2,312 4,093 13,468 
20221,263 20,032 61 7,337 9,679 496 5,797 (769)1,740 3,141 11,078