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Schedule V Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Dec. 31, 2017
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Movement in Valuation allowance and reserves          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest   $ 2      
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings          
Movement in Valuation allowance and reserves          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest       $ (18)  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings | Reinsurance Recoverable Including Reinsurance Premium Paid [Member]          
Movement in Valuation allowance and reserves          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest       2  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings | Premiums Receivable [Member]          
Movement in Valuation allowance and reserves          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest       23  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings | Commercial Loan [Member]          
Movement in Valuation allowance and reserves          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest       19  
SEC Schedule, 12-09, Allowance, Loss on Finance Receivable          
Movement in Valuation allowance and reserves          
Valuation allowances and reserves $ 23        
Increase (decrease) in Costs and Expenses 30        
Write-offs/ Payments/ Other (7)        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 23        
SEC Schedule, 12-09, Allowance, Loan and Lease Loss, Real Estate [Member]          
Movement in Valuation allowance and reserves          
Valuation allowances and reserves 38 0 $ 1 19 $ 1
Increase (decrease) in Costs and Expenses 19 (1) 0    
Write-offs/ Payments/ Other 0 0 0    
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 38 0 1 19 1
SEC Schedule, 12-09, Allowance, Uncollectible Premium Receivable          
Movement in Valuation allowance and reserves          
Valuation allowances and reserves 152 145 135 122 132
Increase (decrease) in Costs and Expenses 74 42 40    
Write-offs/ Payments/ Other (44) (32) (37)    
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 152 145 135 122 132
SEC Schedule, 12-09, Allowance, Reinsurance Recoverable [Member]          
Movement in Valuation allowance and reserves          
Valuation allowances and reserves 108 114 126 116 104
Increase (decrease) in Costs and Expenses 4 2 3    
Write-offs/ Payments/ Other (12) (14) 19    
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 108 114 126 116 104
Valuation allowance for deferred taxes          
Movement in Valuation allowance and reserves          
Valuation allowances and reserves 4 4 0 4 0
Increase (decrease) in Costs and Expenses 9 0 0    
Write-offs/ Payments/ Other (9) 4 0    
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount $ 4 $ 4 $ 0 $ 4 $ 0