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Schedule V Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2023
Jan. 01, 2022
Jan. 01, 2021
SEC Schedule, 12-09, Allowance, Loss on Finance Receivable            
Movement in Valuation allowance and reserves            
Valuation allowances and reserves $ 16 $ 21 $ 12 $ 21 $ 12 $ 1
Increase (decrease) in Costs and Expenses 2 14 18      
Write-offs/ Payments/ Other 7 5 7      
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 16 21 12 21 12 1
SEC Schedule, 12-09, Allowance, Loan and Lease Loss, Real Estate [Member]            
Movement in Valuation allowance and reserves            
Valuation allowances and reserves 44 51 36 51 36 29
Increase (decrease) in Costs and Expenses (3) 15 7      
Write-offs/ Payments/ Other 4 0 0      
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 44 51 36 51 36 29
SEC Schedule, 12-09, Allowance, Uncollectible Premium Receivable            
Movement in Valuation allowance and reserves            
Valuation allowances and reserves 117 109 109 109 109 105
Increase (decrease) in Costs and Expenses 65 50 51      
Write-offs/ Payments/ Other 57 50 47      
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 117 109 109 109 109 105
SEC Schedule, 12-09, Allowance, Reinsurance Recoverable [Member]            
Movement in Valuation allowance and reserves            
Valuation allowances and reserves 75 103 105 103 105 99
Increase (decrease) in Costs and Expenses (11) 14 3      
Write-offs/ Payments/ Other 17 16 3      
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 75 103 105 103 105 99
Valuation allowance for deferred taxes            
Movement in Valuation allowance and reserves            
Valuation allowances and reserves 0 12 27 12 27 7
Increase (decrease) in Costs and Expenses 0 0 20      
Write-offs/ Payments/ Other 12 15 0      
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount $ 0 $ 12 $ 27 $ 12 $ 27 $ 7