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Reinsurance - Credit Quality Information (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross $ 7,175   $ 7,215      
Reinsurance Recoverable, Allowance for Credit Loss (75)   (75) $ (102)    
Net Reinsurance Recoverables 7,100   7,140      
Mandatory and Voluntary Risk Pools [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 204   205      
Captives [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 425   402      
Other not rated companies [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 189   181      
AMBestRated [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 6,357   6,427      
AM Best, A++ Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 2,200   2,271      
AM Best, A+ Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 2,757   2,674      
AM Best, A Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 756   830      
AM Best, A- Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 618   626      
AM Best, B++ Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 4   4      
AM Best, Below B plus plus Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 22   22      
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 6,663   6,698      
Reinsurance Recoverable, Allowance for Credit Loss (72) $ (72) (72) (99) $ (98) $ (100)
Net Reinsurance Recoverables 6,591   6,626      
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Mandatory and Voluntary Risk Pools [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 204   205      
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Captives [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 425   402      
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Other not rated companies [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 183   176      
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Reinsurance Contract [Axis]: Before Disputed Amounts [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverable, Allowance for Credit Loss (21) (20) (24) (45) (44) (43)
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Reinsurance Contract [Axis]: Disputes [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverable, Allowance for Credit Loss (51) $ (52) (48) (54) $ (54) $ (57)
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | AMBestRated [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 5,851   5,915      
Operating Segments [Member] | Group Insurance Policy [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 293   291      
Reinsurance Recoverable, Allowance for Credit Loss (1)   (1) (1)    
Net Reinsurance Recoverables 292   290      
Operating Segments [Member] | Group Insurance Policy [Member] | Mandatory and Voluntary Risk Pools [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 0   0      
Operating Segments [Member] | Group Insurance Policy [Member] | Captives [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 0   0      
Operating Segments [Member] | Group Insurance Policy [Member] | Other not rated companies [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 6   5      
Operating Segments [Member] | Group Insurance Policy [Member] | AMBestRated [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 287   286      
Operating Segments [Member] | AM Best, A++ Rating [Member] | Property, Liability and Casualty Insurance Product Line            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 2,200   2,271      
Operating Segments [Member] | AM Best, A++ Rating [Member] | Group Insurance Policy [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 0   0      
Operating Segments [Member] | AM Best, A+ Rating [Member] | Property, Liability and Casualty Insurance Product Line            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 2,257   2,169      
Operating Segments [Member] | AM Best, A+ Rating [Member] | Group Insurance Policy [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 283   281      
Operating Segments [Member] | AM Best, A Rating [Member] | Property, Liability and Casualty Insurance Product Line            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 755   829      
Operating Segments [Member] | AM Best, A Rating [Member] | Group Insurance Policy [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 1   1      
Operating Segments [Member] | AM Best, A- Rating [Member] | Property, Liability and Casualty Insurance Product Line            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 615   622      
Operating Segments [Member] | AM Best, A- Rating [Member] | Group Insurance Policy [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 3   4      
Operating Segments [Member] | AM Best, B++ Rating [Member] | Property, Liability and Casualty Insurance Product Line            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 2   2      
Operating Segments [Member] | AM Best, B++ Rating [Member] | Group Insurance Policy [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 0   0      
Operating Segments [Member] | AM Best, Below B plus plus Rating [Member] | Property, Liability and Casualty Insurance Product Line            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 22   22      
Operating Segments [Member] | AM Best, Below B plus plus Rating [Member] | Group Insurance Policy [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 0   0      
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 219   226      
Reinsurance Recoverable, Allowance for Credit Loss (2)   (2) $ (2)    
Net Reinsurance Recoverables 217   224      
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Mandatory and Voluntary Risk Pools [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 0   0      
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Captives [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 0   0      
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Other not rated companies [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 0   0      
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AMBestRated [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 219   226      
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AM Best, A++ Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 0   0      
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AM Best, A+ Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 217   224      
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AM Best, A Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 0   0      
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AM Best, A- Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 0   0      
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AM Best, B++ Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 2   2      
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | AM Best, Below B plus plus Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross $ 0   $ 0