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Claims Development - Homeowner (Details)
reported_claim in Thousands, $ in Millions
Dec. 31, 2020
USD ($)
reported_claim
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, $ 3,158        
Liabilities for loss and ALAE, net of reinsurance 6,394        
Home Owner Line | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 1,996        
Cumulative paid losses and ALAE, net of reinsurance 1,781        
All outstanding liabilities before, net of reinsurance 4        
Liabilities for loss and ALAE, net of reinsurance 219        
2016 | Home Owner Line | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 304 $ 302 $ 303 $ 304 $ 315
Total of incurred but not reported liabilities plus expected development on reported losses $ 0        
Cumulative number of reported claims | reported_claim 23        
Cumulative paid losses and ALAE, net of reinsurance $ 302 299 295 283 $ 208
2017 | Home Owner Line | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 387 385 383 356  
Total of incurred but not reported liabilities plus expected development on reported losses $ 0        
Cumulative number of reported claims | reported_claim 26        
Cumulative paid losses and ALAE, net of reinsurance $ 384 378 356 $ 277  
2018 | Home Owner Line | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 387 386 370    
Total of incurred but not reported liabilities plus expected development on reported losses $ 5        
Cumulative number of reported claims | reported_claim 24        
Cumulative paid losses and ALAE, net of reinsurance $ 378 368 $ 268    
2019 | Home Owner Line | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 421 432      
Total of incurred but not reported liabilities plus expected development on reported losses $ 10        
Cumulative number of reported claims | reported_claim 22        
Cumulative paid losses and ALAE, net of reinsurance $ 391 $ 303      
2020 | Home Owner Line | Personal Insurance          
Claims Development          
Incurred losses and ALAE, net of reinsurance for the years ended December 31, 497        
Total of incurred but not reported liabilities plus expected development on reported losses $ 54        
Cumulative number of reported claims | reported_claim 21        
Cumulative paid losses and ALAE, net of reinsurance $ 326