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Premiums Receivable - Rollforward of Premiums Receivable and Agents' Balances (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]  
Premium Receivable, Allowance for Credit Loss $ (145)
Premium Receivable, Credit Loss Expense (Reversal) 74
Premium Receivable, Allowance for Credit Loss, Writeoff 49
Premium Receivable, Allowance for Credit Loss, Recovery (5)
Premium Receivable, Allowance for Credit Loss (152)
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Premium Receivable, Allowance for Credit Loss (122)
Premiums Receivable, Due in One Year or Less, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums [Member]  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Premium Receivable, Allowance for Credit Loss (85)
Premium Receivable, Credit Loss Expense (Reversal) 78
Premium Receivable, Allowance for Credit Loss, Writeoff 49
Premium Receivable, Allowance for Credit Loss, Recovery (5)
Premium Receivable, Allowance for Credit Loss (117)
Premiums Receivable, Due in One Year or Less, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Premium Receivable, Allowance for Credit Loss (83)
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member]  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Premium Receivable, Allowance for Credit Loss (60)
Premium Receivable, Credit Loss Expense (Reversal) (4)
Premium Receivable, Allowance for Credit Loss, Writeoff 0
Premium Receivable, Allowance for Credit Loss, Recovery 0
Premium Receivable, Allowance for Credit Loss (35)
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Premium Receivable, Allowance for Credit Loss (39)
Premiums Receivable [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Premium Receivable, Allowance for Credit Loss 23
Premiums Receivable [Member] | Accounting Standards Update 2016-13 [Member] | Premiums Receivable, Due in One Year or Less, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Premium Receivable, Allowance for Credit Loss 2
Premiums Receivable [Member] | Accounting Standards Update 2016-13 [Member] | Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Premium Receivable, Allowance for Credit Loss $ 21