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Claims Development - Personal Auto (Details)
reported_claim in Thousands, $ in Millions
Dec. 31, 2021
USD ($)
reported_claim
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, $ 3,118        
Liabilities for loss and ALAE, net of reinsurance 6,917        
Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 1,802        
Cumulative paid losses and ALAE, net of reinsurance 1,552        
All outstanding liabilities before, net of reinsurance 10        
Liabilities for loss and ALAE, net of reinsurance 260        
2017 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 393 $ 393 $ 391 $ 394 $ 412
Total of incurred but not reported liabilities plus expected development on reported losses $ 1        
Cumulative number of reported claims | reported_claim 109        
Cumulative paid losses and ALAE, net of reinsurance $ 383 374 358 324 $ 256
2018 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 398 395 398 424  
Total of incurred but not reported liabilities plus expected development on reported losses $ 0        
Cumulative number of reported claims | reported_claim 111        
Cumulative paid losses and ALAE, net of reinsurance $ 379 358 327 $ 262  
2019 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 380 383 399    
Total of incurred but not reported liabilities plus expected development on reported losses $ 2        
Cumulative number of reported claims | reported_claim 102        
Cumulative paid losses and ALAE, net of reinsurance $ 346 314 $ 250    
2020 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 281 305      
Total of incurred but not reported liabilities plus expected development on reported losses $ 18        
Cumulative number of reported claims | reported_claim 71        
Cumulative paid losses and ALAE, net of reinsurance $ 225 $ 186      
2021 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 350        
Total of incurred but not reported liabilities plus expected development on reported losses $ 51        
Cumulative number of reported claims | reported_claim 75        
Cumulative paid losses and ALAE, net of reinsurance $ 219