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Premiums Receivable (Tables)
 12 Months Ended
Dec. 31, 2024
Credit Loss [Abstract]  
Premium Receivable, Allowance for Credit Loss [Table Text Block]
Premiums Receivable and Agents' Balances
As of December 31,
20242023
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums ("loss sensitive business")$5,624 $5,303 
Receivables for loss sensitive business, by credit quality:
AA97 94 
A57 54 
BBB193 136 
BB94 84 
Below BB50 45 
Total receivables for loss sensitive business491 413 
Total Premiums Receivable and Agents' Balances, Gross6,115 5,716 
ACL(117)(109)
Total Premiums Receivable and Agents' Balances, Net of ACL$5,998 $5,607 
Rollforward of ACL on Premiums Receivable and Agents' Balances for the Year Ended
December 31, 2024December 31, 2023December 31, 2022
Receivables Excluding Receivables for Loss Sensitive BusinessReceivables for Loss Sensitive BusinessTotalReceivables Excluding Receivables for Loss Sensitive BusinessReceivables for Loss Sensitive BusinessTotalReceivables Excluding Receivables for Loss Sensitive BusinessReceivables for Loss Sensitive BusinessTotal
Beginning ACL$89 $20 $109 $85 $24 $109 $83 $22 $105 
Current period provision (release)64 1 65 52 (2)50 48 3 51 
Current period gross write-offs(62)(1)(63)(55)(2)(57)(56)(1)(57)
Current period gross recoveries6 — 6 7 — 7 10 — 10 
Ending ACL$97 $20 $117 $89 $20 $109 $85 $24 $109