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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2024
Reinsurance Disclosures [Abstract]  
Summary of reinsurance financial data [Table Text Block]
The following is a summary of reinsurance financial data reflected in the consolidated statement of income:
(for the year ended December 31, in millions)202420232022
Written premiums
Direct$44,377 $40,983 $36,648 
Assumed2,173 1,989 1,228 
Ceded(3,194)(2,771)(2,462)
Total net written premiums$43,356 $40,201 $35,414 
Earned premiums
Direct$42,983 $38,796 $34,948 
Assumed2,095 1,614 1,145 
Ceded(3,137)(2,649)(2,330)
Total net earned premiums$41,941 $37,761 $33,763 
Percentage of assumed earned premiums to net earned premiums5.0 %4.3 %3.4 %
Ceded claims and claim adjustment expenses incurred$1,249 $1,462 $1,187 
Reinsurance recoverables [Table Text Block]
Reinsurance recoverables include amounts recoverable on both paid and unpaid claims and claim adjustment expenses and were as follows:
(at December 31, in millions)20242023
Gross reinsurance recoverables on paid and unpaid claims and claim adjustment expenses$3,962 $3,895 
Gross structured settlements2,626 2,707 
Mandatory pools and associations1,531 1,659 
     Gross reinsurance recoverables8,119 8,261 
Allowance for estimated uncollectible reinsurance(119)(118)
    Net reinsurance recoverables$8,000 $8,143