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Reinsurance (Tables)
 9 Months Ended
Sep. 30, 2024
Reinsurance Disclosures [Abstract]  
Reinsurance Recoverable, Credit Quality Indicator [Table Text Block]
Reinsurance Recoverables by Credit Quality Indicator
As of September 30, 2024As of December 31, 2023
P&C
Group Benefits
CorporateTotal
P&C
Group Benefits
CorporateTotal
A.M. Best Financial Strength Rating
A++$2,284 $— $— $2,284 $2,398 $— $— $2,398 
A+2,066 276 226 2,568 2,030 251 241 2,522 
A808 1 — 809 810 1 — 811 
A-624 4 — 628 653 5 — 658 
B++2 — 2 4 2 — 3 5 
Below B++22 — — 22 22 — — 22 
Total Rated by A.M. Best
5,806 281 228 6,315 5,915 257 244 6,416 
Mandatory (Assigned) and Voluntary Risk Pools206 — — 206 208 — — 208 
Captives373 — — 373 353 — — 353 
Other not rated companies254 6 — 260 226 4 — 230 
Gross Reinsurance Recoverables
6,639 287 228 7,154 6,702 261 244 7,207 
Allowance for uncollectible reinsurance
(99)(1)(2)(102)(100)(1)(2)(103)
Net Reinsurance Recoverables
$6,540 $286 $226 $7,052 $6,602 $260 $242 $7,104 
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,
2024202320242023
P&C beginning allowance for uncollectible reinsurance$99 $107 $100 $102 
Beginning allowance for disputed amounts54 62 57 60 
P&C beginning ACL45 45 43 42 
Current period provision1 1 3 4 
Current period gross write-offs(1)— (1)— 
P&C ending ACL45 46 45 46 
Ending allowance for disputed amounts54 60 54 60 
P&C ending allowance for uncollectible reinsurance99 106 99 106 
Group Benefits allowance for uncollectible reinsurance1 1 1 1 
Corporate allowance for uncollectible reinsurance2 2 2 2 
Total allowance for uncollectible reinsurance$102 $109 $102 $109