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Premiums Receivable (Tables)
 9 Months Ended
Sep. 30, 2023
Credit Loss [Abstract]  
Premium Receivable, Allowance for Credit Loss [Table Text Block]
Premiums Receivable and Agents' Balances
As of September 30, 2023As of December 31, 2022
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums ("loss sensitive business")$5,281 $4,698 
Receivables for loss sensitive business, by credit quality:
AA101 106 
A43 38 
BBB127 119 
BB60 56 
Below BB40 41 
Total receivables for loss sensitive business371 360 
Total Premiums Receivable and Agents' Balances, Gross
5,652 5,058 
ACL(117)(109)
Total Premiums Receivable and Agents' Balances, Net of ACL
$5,535 $4,949 
Rollforward of ACL on Premiums Receivable and Agents' Balances for the Three Months Ended
September 30, 2023September 30, 2022
Premiums Receivable and Agents' Balances, Excluding Receivables for Loss Sensitive BusinessReceivables for Loss Sensitive BusinessTotalPremiums Receivable and Agents' Balances, Excluding Receivables for Loss Sensitive BusinessReceivables for Loss Sensitive BusinessTotal
Beginning ACL$94 $25 $119 $84 $23 $107 
Current period provision (release)11 1 12 12 1 13 
Current period write-offs(14)(1)(15)(13)(1)(14)
Current period recoveries1 — 1 2 — 2 
Ending ACL$92 $25 $117 $85 $23 $108 
Rollforward of ACL on Premiums Receivable and Agents' Balances for the Nine Months Ended
September 30, 2023September 30, 2022
Premiums Receivable and Agents' Balances, Excluding Receivables for Loss Sensitive BusinessReceivables for Loss Sensitive BusinessTotalPremiums Receivable and Agents' Balances, Excluding Receivables for Loss Sensitive BusinessReceivables for Loss Sensitive BusinessTotal
Beginning ACL
$85 $24 $109 $83 $22 $105 
Current period provision (release)42 2 44 35 2 37 
Current period write-offs(41)(1)(42)(41)(1)(42)
Current period recoveries6 — 6 8 — 8 
Ending ACL
$92 $25 $117 $85 $23 $108