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Claims Development - Personal Auto (Details)
reported_claim in Thousands, $ in Millions
Dec. 31, 2022
USD ($)
reported_claim
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, $ 3,312        
Liabilities for loss and ALAE, net of reinsurance 7,967        
Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 1,831        
Cumulative paid losses and ALAE, net of reinsurance 1,557        
All outstanding liabilities before, net of reinsurance 13        
Liabilities for loss and ALAE, net of reinsurance 287        
2018 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 401 $ 398 $ 395 $ 398 $ 424
Total of incurred but not reported liabilities plus expected development on reported losses $ 3        
Cumulative number of reported claims | reported_claim 111        
Cumulative paid losses and ALAE, net of reinsurance $ 391 379 358 327 $ 262
2019 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 383 380 383 399  
Total of incurred but not reported liabilities plus expected development on reported losses $ 4        
Cumulative number of reported claims | reported_claim 102        
Cumulative paid losses and ALAE, net of reinsurance $ 363 346 314 $ 250  
2020 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 277 281 305    
Total of incurred but not reported liabilities plus expected development on reported losses $ 7        
Cumulative number of reported claims | reported_claim 71        
Cumulative paid losses and ALAE, net of reinsurance $ 248 225 $ 186    
2021 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 343 350      
Total of incurred but not reported liabilities plus expected development on reported losses $ 14        
Cumulative number of reported claims | reported_claim 80        
Cumulative paid losses and ALAE, net of reinsurance $ 278 $ 219      
2022 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 427        
Total of incurred but not reported liabilities plus expected development on reported losses $ 58        
Cumulative number of reported claims | reported_claim 80        
Cumulative paid losses and ALAE, net of reinsurance $ 277