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Property Casualty Loss and Loss Expense - Claims Development - Workers Compensation (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                  
Workers' Compensation Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 1,746                  
Cumulative paid losses and ALAE, net of reinsurance 1,105                  
All outstanding liabilities before, net of reinsurance 326                  
Liabilities for loss and ALAE, net of reinsurance 967                  
2015 | Workers' Compensation Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 168 $ 167 $ 171 $ 173 $ 173 $ 179 $ 195 $ 208 $ 220 $ 246
Total of incurred but not reported liabilities plus expected development on reported losses $ 22                  
Cumulative number of reported claims | reported_claim 17                  
Cumulative paid losses and ALAE, net of reinsurance $ 141 140 139 139 137 134 129 115 93 $ 47
2016 | Workers' Compensation Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 182 181 183 183 183 188 206 218 230  
Total of incurred but not reported liabilities plus expected development on reported losses $ 24                  
Cumulative number of reported claims | reported_claim 16                  
Cumulative paid losses and ALAE, net of reinsurance $ 152 150 148 146 141 131 119 97 $ 46  
2017 | Workers' Compensation Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 159 160 167 172 183 190 208 218    
Total of incurred but not reported liabilities plus expected development on reported losses $ 22                  
Cumulative number of reported claims | reported_claim 15                  
Cumulative paid losses and ALAE, net of reinsurance $ 127 126 122 119 114 106 88 $ 45    
2018 | Workers' Compensation Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 174 175 179 186 199 207 222      
Total of incurred but not reported liabilities plus expected development on reported losses $ 28                  
Cumulative number of reported claims | reported_claim 15                  
Cumulative paid losses and ALAE, net of reinsurance $ 138 135 133 127 115 95 $ 48      
2019 | Workers' Compensation Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 174 178 188 202 215 224        
Total of incurred but not reported liabilities plus expected development on reported losses $ 31                  
Cumulative number of reported claims | reported_claim 14                  
Cumulative paid losses and ALAE, net of reinsurance $ 132 129 122 115 94 $ 49        
2020 | Workers' Compensation Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 148 153 172 190 204          
Total of incurred but not reported liabilities plus expected development on reported losses $ 37                  
Cumulative number of reported claims | reported_claim 11                  
Cumulative paid losses and ALAE, net of reinsurance $ 101 96 82 68 $ 37          
2021 | Workers' Compensation Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 174 183 190 202            
Total of incurred but not reported liabilities plus expected development on reported losses $ 39                  
Cumulative number of reported claims | reported_claim 11                  
Cumulative paid losses and ALAE, net of reinsurance $ 113 100 82 $ 37            
2022 | Workers' Compensation Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 182 205 209              
Total of incurred but not reported liabilities plus expected development on reported losses $ 53                  
Cumulative number of reported claims | reported_claim 11                  
Cumulative paid losses and ALAE, net of reinsurance $ 94 76 $ 37              
2023 | Workers' Compensation Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 188 221                
Total of incurred but not reported liabilities plus expected development on reported losses $ 68                  
Cumulative number of reported claims | reported_claim 9                  
Cumulative paid losses and ALAE, net of reinsurance $ 71 $ 36                
2024 | Workers' Compensation Line | Commercial Insurance                    
Claims Development                    
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 197                  
Total of incurred but not reported liabilities plus expected development on reported losses $ 84                  
Cumulative number of reported claims | reported_claim 7                  
Cumulative paid losses and ALAE, net of reinsurance $ 36