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Schedule V Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2022
Jan. 01, 2021
Jan. 01, 2020
Dec. 31, 2019
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 $ 12 $ 1 $ 23 $ 1 $ 23    
Increase (decrease) in Costs and Expenses 18 (4) 30        
Write-offs/ Payments/ Other 7 18 7        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 12 1 23 1 23    
SEC Schedule, 12-09, Allowance, Loan and Lease Loss, Real Estate [Member]              
Movement in Valuation allowance and reserves              
Valuation allowances and reserves 36 29 38 29 38 19  
Increase (decrease) in Costs and Expenses 7 (9) 19        
Write-offs/ Payments/ Other 0 0 0        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 36 29 38 29 38 19  
SEC Schedule, 12-09, Allowance, Uncollectible Premium Receivable              
Movement in Valuation allowance and reserves              
Valuation allowances and reserves 109 105 152 105 152 122  
Increase (decrease) in Costs and Expenses 51 4 74        
Write-offs/ Payments/ Other 47 51 44        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 109 105 152 105 152 122  
SEC Schedule, 12-09, Allowance, Reinsurance Recoverable [Member]              
Movement in Valuation allowance and reserves              
Valuation allowances and reserves 105 99 108 99 108 116  
Increase (decrease) in Costs and Expenses 3 3 4        
Write-offs/ Payments/ Other 3 12 12        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 105 99 108 99 108 116  
Valuation allowance for deferred taxes              
Movement in Valuation allowance and reserves              
Valuation allowances and reserves 27 7 4 7 4 4  
Increase (decrease) in Costs and Expenses 20 9 9        
Write-offs/ Payments/ Other 0 6 9        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount $ 27 $ 7 $ 4 $ 7 $ 4 $ 4