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Reinsurance (Reinsurance Recoverable by Category and Listing of Largest Reinsurers) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Ceded Credit Risk [Line Items]      
Gross Reinsurance Recoverable on Loss and Loss Expenses $ 17,695    
Valuation allowance for Uncollectible Reinsurance $ 329 $ 314 $ 316
% of Gross Reinsurance Recoverable 1.90%    
Largest reinsurers      
Ceded Credit Risk [Line Items]      
Gross Reinsurance Recoverable on Loss and Loss Expenses $ 8,441    
Valuation allowance for Uncollectible Reinsurance $ 102    
% of Gross Reinsurance Recoverable 1.20%    
Other reinsurers rated A- or better      
Ceded Credit Risk [Line Items]      
Gross Reinsurance Recoverable on Loss and Loss Expenses $ 5,435    
Valuation allowance for Uncollectible Reinsurance $ 63    
% of Gross Reinsurance Recoverable 1.20%    
Other reinsurers rated lower than A- or not rated      
Ceded Credit Risk [Line Items]      
Gross Reinsurance Recoverable on Loss and Loss Expenses $ 315    
Valuation allowance for Uncollectible Reinsurance $ 48    
% of Gross Reinsurance Recoverable 15.30%    
Pools      
Ceded Credit Risk [Line Items]      
Gross Reinsurance Recoverable on Loss and Loss Expenses $ 415    
Valuation allowance for Uncollectible Reinsurance $ 10    
% of Gross Reinsurance Recoverable 2.40%    
Structured settlements      
Ceded Credit Risk [Line Items]      
Gross Reinsurance Recoverable on Loss and Loss Expenses $ 516    
Valuation allowance for Uncollectible Reinsurance $ 13    
% of Gross Reinsurance Recoverable 2.50%    
Captives      
Ceded Credit Risk [Line Items]      
Gross Reinsurance Recoverable on Loss and Loss Expenses $ 2,325    
Valuation allowance for Uncollectible Reinsurance $ 28    
% of Gross Reinsurance Recoverable 1.20%    
Other      
Ceded Credit Risk [Line Items]      
Gross Reinsurance Recoverable on Loss and Loss Expenses $ 248    
Valuation allowance for Uncollectible Reinsurance $ 65    
% of Gross Reinsurance Recoverable 26.20%