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Reinsurance (Tables)
 3 Months Ended
Mar. 31, 2025
Reinsurance Disclosures [Abstract]  
Reinsurance Recoverable, Credit Quality Indicator [Table Text Block]
Reinsurance Recoverables by Credit Quality Indicator
As of March 31, 2025As of December 31, 2024
P&C
Employee Benefits
CorporateTotal
P&C
Employee Benefits
CorporateTotal
A.M. Best Financial Strength Rating
A++$2,250 $— $— $2,250 $2,271 $— $— $2,271 
A+2,188 286 220 2,694 2,169 281 224 2,674 
A838 1 — 839 829 1 — 830 
A-619 4 — 623 622 4 — 626 
B++2 — 2 4 2 — 2 4 
Below B++22 — — 22 22 — — 22 
Total Rated by A.M. Best
5,919 291 222 6,432 5,915 286 226 6,427 
Mandatory (Assigned) and Voluntary Risk Pools208 — — 208 205 — — 205 
Captives419 — — 419 402 — — 402 
Other not rated companies195 6 — 201 176 5 — 181 
Gross Reinsurance Recoverables
6,741 297 222 7,260 6,698 291 226 7,215 
Allowance for uncollectible reinsurance
(72)(1)(2)(75)(72)(1)(2)(75)
Net Reinsurance Recoverables
$6,669 $296 $220 $7,185 $6,626 $290 $224 $7,140 
Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block]
Allowance for Uncollectible Reinsurance for the Three Months Ended
Three Months Ended March 31,
20252024
P&C beginning allowance for uncollectible reinsurance$72 $100 
Beginning allowance for disputed amounts48 57 
P&C beginning ACL24 43 
Current period provision (release)(4)1 
P&C ending ACL20 44 
Ending allowance for disputed amounts52 54 
P&C ending allowance for uncollectible reinsurance72 98 
Employee Benefits allowance for uncollectible reinsurance1 1 
Corporate allowance for uncollectible reinsurance2 2 
Total allowance for uncollectible reinsurance$75 $101