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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$3,709 $1,878 $6,705 $8,536 78.6 %
December 31, 2022
Total property and liability insurance premiums earned$3,544 $1,613 $5,945 $7,876 75.5 %
December 31, 2021
Total property and liability insurance premiums earned$2,982 $1,544 $5,741 $7,179 80.0 %