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Reinsurance (Tables)
 9 Months Ended
Sep. 30, 2025
Reinsurance Disclosures [Abstract]  
Reinsurance Recoverable, Credit Quality Indicator [Table Text Block]
Reinsurance Recoverables by Credit Quality Indicator
As of September 30, 2025As of December 31, 2024
P&C
Employee Benefits
CorporateTotal
P&C
Employee Benefits
CorporateTotal
A.M. Best Financial Strength Rating
A++$2,188 $— $— $2,188 $2,271 $— $— $2,271 
A+2,271 280 221 2,772 2,169 281 224 2,674 
A751 1 — 752 829 1 — 830 
A-612 3 — 615 622 4 — 626 
B++2 — 2 4 2 — 2 4 
Below B++22 — — 22 22 — — 22 
Total Rated by A.M. Best
5,846 284 223 6,353 5,915 286 226 6,427 
Mandatory (Assigned) and Voluntary Risk Pools187 — — 187 205 — — 205 
Captives420 — — 420 402 — — 402 
Other not rated companies201 6 — 207 176 5 — 181 
Gross Reinsurance Recoverables
6,654 290 223 7,167 6,698 291 226 7,215 
Allowance for uncollectible reinsurance
(73)(1)(2)(76)(72)(1)(2)(75)
Net Reinsurance Recoverables
$6,581 $289 $221 $7,091 $6,626 $290 $224 $7,140 
Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block]
Allowance for Uncollectible Reinsurance for the Three and Nine Months Ended
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
P&C beginning allowance for uncollectible reinsurance$72 $99 $72 $100 
Beginning allowance for disputed amounts51 54 48 57 
P&C beginning ACL21 45 24 43 
Current period provision (release)1 1 (2)3 
Current period gross write-offs— (1)— (1)
P&C ending ACL22 45 22 45 
Ending allowance for disputed amounts51 54 51 54 
P&C ending allowance for uncollectible reinsurance73 99 73 99 
Employee Benefits allowance for uncollectible reinsurance1 1 1 1 
Corporate allowance for uncollectible reinsurance2 2 2 2 
Total allowance for uncollectible reinsurance$76 $102 $76 $102