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Premiums Receivable (Tables)
 3 Months Ended
Mar. 31, 2021
Credit Loss [Abstract]  
Premium Receivable, Allowance for Credit Loss [Table Text Block]
Premiums Receivable and Agents' Balances
As of March 31, 2021As of December 31, 2020
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums$4,058 $3,851 
Receivables for loss within a deductible and retrospectively-rated policy premiums, by credit quality:
AAA— — 
AA140 142 
A65 62 
BBB186 185 
BB115 115 
Below BB67 65 
Total receivables for losses within a deductible and retrospectively-rated policy premiums
573 569 
Total Premiums Receivable and Agents' Balances, Gross
4,631 4,420 
ACL(144)(152)
Total Premiums Receivable and Agents' Balances, Net of ACL
$4,487 $4,268 
Rollforward of ACL on Premiums Receivable and Agents' Balances
Three Months Ended March 31, 2021Three Months Ended March 31, 2020
Premiums Receivable and Agents' Balances, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy PremiumsReceivables for Loss within a Deductible and Retrospectively-Rated Policy PremiumsTotalPremiums Receivable and Agents' Balances, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy PremiumsReceivables for Loss within a Deductible and Retrospectively-Rated Policy PremiumsTotal
Beginning ACL
$117 $35 $152 $85 $60 $145 
Cumulative effect of accounting change [1](2)(21)(23)
Adjusted beginning ACL117 35 152 83 39 122 
Current period provision (release)4 1 5 28 2 30 
Current period gross write-offs(15)— (15)(15)— (15)
Current period gross recoveries2 — 2 2 — 2 
Ending ACL
$108 $36 $144 $98 $41 $139 
[1]Represents the adjustment to the ACL recorded on adoption of accounting guidance for credit losses on January 1, 2020. The adjusted beginning ACL was based on the Company's historical loss information adjusted for current conditions and the forecasted economic environment at the time the guidance was adopted. For further information, see Note 1 - Basis of Presentation and Significant Accounting Policies of Notes to Consolidated Financial Statements included in the Company's 2020 Form 10-K Annual Report.