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Reinsurance (Tables)
 6 Months Ended
Jun. 30, 2025
Reinsurance Disclosures [Abstract]  
Reinsurance Recoverable, Credit Quality Indicator [Table Text Block]
Reinsurance Recoverables by Credit Quality Indicator
As of June 30, 2025As of December 31, 2024
P&C
Employee Benefits
CorporateTotal
P&C
Employee Benefits
CorporateTotal
A.M. Best Financial Strength Rating
A++$2,200 $— $— $2,200 $2,271 $— $— $2,271 
A+2,257 283 217 2,757 2,169 281 224 2,674 
A755 1 — 756 829 1 — 830 
A-615 3 — 618 622 4 — 626 
B++2 — 2 4 2 — 2 4 
Below B++22 — — 22 22 — — 22 
Total Rated by A.M. Best
5,851 287 219 6,357 5,915 286 226 6,427 
Mandatory (Assigned) and Voluntary Risk Pools204 — — 204 205 — — 205 
Captives425 — — 425 402 — — 402 
Other not rated companies183 6 — 189 176 5 — 181 
Gross Reinsurance Recoverables
6,663 293 219 7,175 6,698 291 226 7,215 
Allowance for uncollectible reinsurance
(72)(1)(2)(75)(72)(1)(2)(75)
Net Reinsurance Recoverables
$6,591 $292 $217 $7,100 $6,626 $290 $224 $7,140 
Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block]
Allowance for Uncollectible Reinsurance for the Three and Six Months Ended
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
P&C beginning allowance for uncollectible reinsurance$72 $98 $72 $100 
Beginning allowance for disputed amounts52 54 48 57 
P&C beginning ACL20 44 24 43 
Current period provision (release)1 1 (3)2 
P&C ending ACL21 45 21 45 
Ending allowance for disputed amounts51 54 51 54 
P&C ending allowance for uncollectible reinsurance72 99 72 99 
Employee Benefits allowance for uncollectible reinsurance1 1 1 1 
Corporate allowance for uncollectible reinsurance2 2 2 2 
Total allowance for uncollectible reinsurance$75 $102 $75 $102