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SCHEDULE IV — REINSURANCE
 12 Months Ended
Dec. 31, 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]  
SCHEDULE IV — REINSURANCE
SCHEDULE IV — REINSURANCE
Column AColumn BColumn CColumn DColumn EColumn F
(Dollars in millions)Gross
Amount		Ceded to
Other
Companies		Assumed
from Other
Companies		Net
Amount		Assumed
to Net
December 31, 2023
Total property and liability insurance premiums earned$4,733 $1,807 $10,518 $13,443 78.2 %
December 31, 2022
Total property and liability insurance premiums earned$4,218 $1,513 $9,082 $11,787 77.1 %
December 31, 2021
Total property and liability insurance premiums earned$3,589 $1,498 $8,315 $10,406 79.9 %