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Property Casualty Loss and Loss Expense - Claims Development - Excess and Surplus Lines (Details)
reported_claim in Thousands, $ in Millions
Dec. 31, 2024
USD ($)
reported_claim
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, $ 3,589                  
Liabilities for loss and ALAE, net of reinsurance 9,416                  
Excess and Surplus Lines Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 1,862                  
Cumulative paid losses and ALAE, net of reinsurance 855                  
All outstanding liabilities before, net of reinsurance 6                  
Liabilities for loss and ALAE, net of reinsurance 1,013                  
2015 | Excess and Surplus Lines Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 66 $ 65 $ 61 $ 65 $ 66 $ 65 $ 67 $ 73 $ 81 $ 96
Total of incurred but not reported liabilities plus expected development on reported losses $ 2                  
Cumulative number of reported claims | reported_claim 2                  
Cumulative paid losses and ALAE, net of reinsurance $ 63 62 58 56 54 51 41 29 19 $ 8
2016 | Excess and Surplus Lines Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 91 89 88 91 90 82 84 87 93  
Total of incurred but not reported liabilities plus expected development on reported losses $ 4                  
Cumulative number of reported claims | reported_claim 3                  
Cumulative paid losses and ALAE, net of reinsurance $ 84 83 81 75 62 51 39 21 $ 10  
2017 | Excess and Surplus Lines Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 98 94 91 94 94 95 95 104    
Total of incurred but not reported liabilities plus expected development on reported losses $ 6                  
Cumulative number of reported claims | reported_claim 3                  
Cumulative paid losses and ALAE, net of reinsurance $ 90 88 77 68 57 41 23 $ 11    
2018 | Excess and Surplus Lines Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 111 105 107 108 110 109 116      
Total of incurred but not reported liabilities plus expected development on reported losses $ 7                  
Cumulative number of reported claims | reported_claim 3                  
Cumulative paid losses and ALAE, net of reinsurance $ 95 88 75 62 50 26 $ 11      
2019 | Excess and Surplus Lines Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 149 142 139 141 135 137        
Total of incurred but not reported liabilities plus expected development on reported losses $ 15                  
Cumulative number of reported claims | reported_claim 3                  
Cumulative paid losses and ALAE, net of reinsurance $ 116 102 79 55 34 $ 13        
2020 | Excess and Surplus Lines Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 165 152 160 172 172          
Total of incurred but not reported liabilities plus expected development on reported losses $ 24                  
Cumulative number of reported claims | reported_claim 4                  
Cumulative paid losses and ALAE, net of reinsurance $ 118 86 56 37 $ 16          
2021 | Excess and Surplus Lines Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 253 233 235 217            
Total of incurred but not reported liabilities plus expected development on reported losses $ 60                  
Cumulative number of reported claims | reported_claim 4                  
Cumulative paid losses and ALAE, net of reinsurance $ 132 82 45 $ 17            
2022 | Excess and Surplus Lines Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 285 280 294              
Total of incurred but not reported liabilities plus expected development on reported losses $ 103                  
Cumulative number of reported claims | reported_claim 4                  
Cumulative paid losses and ALAE, net of reinsurance $ 85 46 $ 21              
2023 | Excess and Surplus Lines Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 276 328                
Total of incurred but not reported liabilities plus expected development on reported losses $ 146                  
Cumulative number of reported claims | reported_claim 3                  
Cumulative paid losses and ALAE, net of reinsurance $ 43 $ 15                
2024 | Excess and Surplus Lines Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 368                  
Total of incurred but not reported liabilities plus expected development on reported losses $ 267                  
Cumulative number of reported claims | reported_claim 2                  
Cumulative paid losses and ALAE, net of reinsurance $ 29