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Reserve for Property-Liability Insurance Claims and Claims Expense - Claims and allocated claim adjustment expenses, net of reinsurance (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
claim
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Increase (decrease) in claims and claims expense          
Liabilities for claims and claim adjustment expenses, net of recoverables $ 20,800        
Auto insurance - liability coverage          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 43,607        
Prior year reserve reestimates (191)        
Prior Year Reserve Estimates (234)        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables 31,392        
All outstanding liabilities before 2015, net of recoverables 1,274        
Liabilities for claims and claim adjustment expenses, net of recoverables 13,489        
Auto insurance - liability coverage | Accident Year 2015          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 8,578 $ 8,617 $ 8,677 $ 8,733 $ 8,763
Prior year reserve reestimates (39)        
IBNR reserves plus expected development on reported claims $ 519        
Cumulative number of reported claims | claim 2,383,853        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 8,059 7,565 6,883 5,837 3,524
Auto insurance - liability coverage | Accident Year 2016          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 8,683 8,732 8,833 9,030  
Prior year reserve reestimates (49)        
IBNR reserves plus expected development on reported claims $ 988        
Cumulative number of reported claims | claim 2,399,890        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 7,695 6,849 5,768 3,485  
Auto insurance - liability coverage | Accident Year 2017          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 8,305 8,389 8,457    
Prior year reserve reestimates (84)        
IBNR reserves plus expected development on reported claims $ 1,777        
Cumulative number of reported claims | claim 2,214,254        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 6,528 5,330 3,149    
Auto insurance - liability coverage | Accident Year 2018          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 8,708 8,727      
Prior year reserve reestimates (19)        
IBNR reserves plus expected development on reported claims $ 3,093        
Cumulative number of reported claims | claim 2,169,753        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 5,615 3,229      
Auto insurance - liability coverage | Accident Year 2019          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 9,333        
IBNR reserves plus expected development on reported claims $ 5,838        
Cumulative number of reported claims | claim 2,108,919        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 3,495        
Auto insurance - liability coverage | Claims incurred and paid from before 2015          
Increase (decrease) in claims and claims expense          
Prior Year Reserve Estimates (56)        
Auto insurance - liability coverage | Unallocated loss adjustment expenses (“ULAE”)          
Increase (decrease) in claims and claims expense          
Prior Year Reserve Estimates 14        
Auto insurance - physical damage coverage          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 25,514        
Prior year reserve reestimates (83)        
Prior Year Reserve Estimates (89)        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables 25,248        
All outstanding liabilities before 2015, net of recoverables 7        
Liabilities for claims and claim adjustment expenses, net of recoverables 273        
Auto insurance - physical damage coverage | Accident Year 2015          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 4,656 4,660 4,669 4,681 4,653
Prior year reserve reestimates (4)        
IBNR reserves plus expected development on reported claims $ 2        
Cumulative number of reported claims | claim 4,390,288        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 4,654 4,655 4,658 4,672 4,507
Auto insurance - physical damage coverage | Accident Year 2016          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 5,020 5,025 5,052 5,125  
Prior year reserve reestimates (5)        
IBNR reserves plus expected development on reported claims $ 5        
Cumulative number of reported claims | claim 4,431,735        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 5,016 5,019 5,031 4,887  
Auto insurance - physical damage coverage | Accident Year 2017          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 5,025 5,037 5,119    
Prior year reserve reestimates (12)        
IBNR reserves plus expected development on reported claims $ (2)        
Cumulative number of reported claims | claim 4,236,640        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 5,027 5,036 4,845    
Auto insurance - physical damage coverage | Accident Year 2018          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 5,154 5,216      
Prior year reserve reestimates (62)        
IBNR reserves plus expected development on reported claims $ 17        
Cumulative number of reported claims | claim 4,306,335        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 5,137 4,968      
Auto insurance - physical damage coverage | Accident Year 2019          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 5,659        
IBNR reserves plus expected development on reported claims $ 244        
Cumulative number of reported claims | claim 4,312,306        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 5,414        
Auto insurance - physical damage coverage | Claims incurred and paid from before 2015          
Increase (decrease) in claims and claims expense          
Prior Year Reserve Estimates (4)        
Auto insurance - physical damage coverage | Unallocated loss adjustment expenses (“ULAE”)          
Increase (decrease) in claims and claims expense          
Prior Year Reserve Estimates (2)        
Homeowners          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 21,481        
Prior year reserve reestimates 78        
Prior Year Reserve Estimates 65        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables 19,618        
All outstanding liabilities before 2015, net of recoverables 126        
Liabilities for claims and claim adjustment expenses, net of recoverables 1,989        
Homeowners | Accident Year 2015          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 3,520 3,537 3,553 3,611 3,558
Prior year reserve reestimates (17)        
IBNR reserves plus expected development on reported claims $ 36        
Cumulative number of reported claims | claim 721,328        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 3,484 3,458 3,399 3,296 $ 2,586
Homeowners | Accident Year 2016          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 3,951 3,955 3,993 3,959  
Prior year reserve reestimates (4)        
IBNR reserves plus expected development on reported claims $ 77        
Cumulative number of reported claims | claim 813,728        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 3,874 3,809 3,678 $ 2,947  
Homeowners | Accident Year 2017          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 4,612 4,617 4,475    
Prior year reserve reestimates (5)        
IBNR reserves plus expected development on reported claims $ 177        
Cumulative number of reported claims | claim 907,218        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 4,435 4,246 $ 3,227    
Homeowners | Accident Year 2018          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 4,851 4,747      
Prior year reserve reestimates 104        
IBNR reserves plus expected development on reported claims $ 340        
Cumulative number of reported claims | claim 807,012        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 4,511 $ 3,489      
Homeowners | Accident Year 2019          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 4,547        
IBNR reserves plus expected development on reported claims $ 1,233        
Cumulative number of reported claims | claim 721,434        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 3,314        
Homeowners | Claims incurred and paid from before 2015          
Increase (decrease) in claims and claims expense          
Prior Year Reserve Estimates (36)        
Homeowners | Unallocated loss adjustment expenses (“ULAE”)          
Increase (decrease) in claims and claims expense          
Prior Year Reserve Estimates 23        
Other personal lines          
Increase (decrease) in claims and claims expense          
Liabilities for claims and claim adjustment expenses, net of recoverables 1,326        
Commercial lines          
Increase (decrease) in claims and claims expense          
Liabilities for claims and claim adjustment expenses, net of recoverables 1,010        
Service Businesses          
Increase (decrease) in claims and claims expense          
Liabilities for claims and claim adjustment expenses, net of recoverables 36        
Discontinued Lines and Coverages          
Increase (decrease) in claims and claims expense          
Liabilities for claims and claim adjustment expenses, net of recoverables 1,286        
Other | Auto insurance - liability coverage          
Increase (decrease) in claims and claims expense          
Prior Year Reserve Estimates (1)        
Other | Auto insurance - physical damage coverage          
Increase (decrease) in claims and claims expense          
Prior Year Reserve Estimates 0        
Other | Homeowners          
Increase (decrease) in claims and claims expense          
Prior Year Reserve Estimates $ 0