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Reinsurance (Tables)
 6 Months Ended
Jun. 30, 2024
Reinsurance Disclosures [Abstract]  
Reinsurance Recoverable, Credit Quality Indicator [Table Text Block]
Reinsurance Recoverables by Credit Quality Indicator
As of June 30, 2024As of December 31, 2023
P&C
Group Benefits
CorporateTotal
P&C
Group Benefits
CorporateTotal
A.M. Best Financial Strength Rating
A++$2,319 $— $— $2,319 $2,398 $— $— $2,398 
A+2,062 263 234 2,559 2,030 251 241 2,522 
A816 1 — 817 810 1 — 811 
A-631 4 — 635 653 5 — 658 
B++3 — 2 5 2 — 3 5 
Below B++22 — — 22 22 — — 22 
Total Rated by A.M. Best
5,853 268 236 6,357 5,915 257 244 6,416 
Mandatory (Assigned) and Voluntary Risk Pools212 — — 212 208 — — 208 
Captives367 — — 367 353 — — 353 
Other not rated companies219 6 — 225 226 4 — 230 
Gross Reinsurance Recoverables
6,651 274 236 7,161 6,702 261 244 7,207 
Allowance for uncollectible reinsurance
(99)(1)(2)(102)(100)(1)(2)(103)
Net Reinsurance Recoverables
$6,552 $273 $234 $7,059 $6,602 $260 $242 $7,104 
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,
2024202320242023
P&C beginning allowance for uncollectible reinsurance$98 $102 $100 $102 
Beginning allowance for disputed amounts54 58 57 60 
P&C beginning ACL44 44 43 42 
Current period provision1 1 2 3 
P&C ending ACL45 45 45 45 
Ending allowance for disputed amounts54 62 54 62 
P&C ending allowance for uncollectible reinsurance99 107 99 107 
Group Benefits allowance for uncollectible reinsurance1 1 1 1 
Corporate allowance for uncollectible reinsurance2 2 2 2 
Total allowance for uncollectible reinsurance$102 $110 $102 $110