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Claims Development - Personal Auto (Details)
reported_claim in Thousands, $ in Millions
Dec. 31, 2019
USD ($)
reported_claim
Dec. 31, 2018
USD ($)
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, $ 2,739        
Liabilities for loss and ALAE, net of reinsurance 5,799        
Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 1,933        
Cumulative paid losses and ALAE, net of reinsurance 1,659        
All outstanding liabilities before, net of reinsurance 6        
Liabilities for loss and ALAE, net of reinsurance 280        
2015 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 361 $ 360 $ 356 $ 356 $ 343
Total of incurred but not reported liabilities plus expected development on reported losses $ 0        
Cumulative number of reported claims | reported_claim 108        
Cumulative paid losses and ALAE, net of reinsurance $ 354 346 325 292 $ 229
2016 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 384 386 384 383  
Total of incurred but not reported liabilities plus expected development on reported losses $ 0        
Cumulative number of reported claims | reported_claim 110        
Cumulative paid losses and ALAE, net of reinsurance $ 370 351 316 $ 243  
2017 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 391 394 412    
Total of incurred but not reported liabilities plus expected development on reported losses $ 0        
Cumulative number of reported claims | reported_claim 109        
Cumulative paid losses and ALAE, net of reinsurance $ 358 324 $ 256    
2018 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 398 424      
Total of incurred but not reported liabilities plus expected development on reported losses $ 18        
Cumulative number of reported claims | reported_claim 111        
Cumulative paid losses and ALAE, net of reinsurance $ 327 $ 262      
Short-Duration Insurance Contract, Accident Year 2019 | Personal Auto | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 399        
Total of incurred but not reported liabilities plus expected development on reported losses $ 54        
Cumulative number of reported claims | reported_claim 96        
Cumulative paid losses and ALAE, net of reinsurance $ 250