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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
Dec. 31, 2017
USD ($)
claim
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Increase (decrease) in claims and claims expense          
Liabilities for claims and claim adjustment expenses, net of reinsurance $ 19,854        
Auto insurance - Liability coverage          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 41,370        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance 29,464        
All outstanding liabilities before 2013, net of reinsurance 1,275        
Liabilities for claims and claim adjustment expenses, net of reinsurance 13,181        
Auto insurance - Liability coverage | Accident Year 2013          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 7,317 $ 7,387 $ 7,446 $ 7,429 $ 7,461
IBNR reserves plus expected development on reported claims $ 513        
Cumulative number of reported claims | claim 2,114,149        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 6,804 6,493 5,946 4,993 2,955
Auto insurance - Liability coverage | Accident Year 2014          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 7,785 7,882 7,955 7,889  
IBNR reserves plus expected development on reported claims $ 951        
Cumulative number of reported claims | claim 2,194,476        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 6,834 6,265 5,322 3,177  
Auto insurance - Liability coverage | Accident Year 2015          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 8,721 8,816 8,896    
IBNR reserves plus expected development on reported claims $ 1,828        
Cumulative number of reported claims | claim 2,380,096        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 6,893 5,846 3,529    
Auto insurance - Liability coverage | Accident Year 2016          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 8,926 9,169      
IBNR reserves plus expected development on reported claims $ 3,149        
Cumulative number of reported claims | claim 2,387,023        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 5,777 3,491      
Auto insurance - Liability coverage | Accident Year 2017          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 8,621        
IBNR reserves plus expected development on reported claims $ 5,465        
Cumulative number of reported claims | claim 2,112,379        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 3,156        
Auto insurance - Physical damage coverage          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 22,980        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance 22,668        
All outstanding liabilities before 2013, net of reinsurance 9        
Liabilities for claims and claim adjustment expenses, net of reinsurance 321        
Auto insurance - Physical damage coverage | Accident Year 2013          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,842 3,844 3,854 3,866 3,894
IBNR reserves plus expected development on reported claims $ 1        
Cumulative number of reported claims | claim 3,777,287        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 3,841 3,841 3,841 3,848 3,718
Auto insurance - Physical damage coverage | Accident Year 2014          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 4,273 4,270 4,296 4,308  
IBNR reserves plus expected development on reported claims $ 3        
Cumulative number of reported claims | claim 4,144,310        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 4,270 4,273 4,281 4,148  
Auto insurance - Physical damage coverage | Accident Year 2015          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 4,676 4,688 4,663    
IBNR reserves plus expected development on reported claims $ 11        
Cumulative number of reported claims | claim 4,388,829        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 4,665 4,679 4,513    
Auto insurance - Physical damage coverage | Accident Year 2016          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 5,058 5,136      
IBNR reserves plus expected development on reported claims $ 19        
Cumulative number of reported claims | claim 4,426,714        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 5,039 4,895      
Auto insurance - Physical damage coverage | Accident Year 2017          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 5,131        
IBNR reserves plus expected development on reported claims $ 278        
Cumulative number of reported claims | claim 4,075,755        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 4,853        
Homeowners          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 18,793        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance 16,917        
All outstanding liabilities before 2013, net of reinsurance 173        
Liabilities for claims and claim adjustment expenses, net of reinsurance 2,049        
Homeowners | Accident Year 2013          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,121 3,142 3,163 3,170 3,098
IBNR reserves plus expected development on reported claims $ 51        
Cumulative number of reported claims | claim 682,873        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 3,070 3,045 2,998 2,885 $ 2,288
Homeowners | Accident Year 2014          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,621 3,653 3,651 3,608  
IBNR reserves plus expected development on reported claims $ 88        
Cumulative number of reported claims | claim 765,001        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 3,533 3,481 3,365 $ 2,736  
Homeowners | Accident Year 2015          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,560 3,622 3,572    
IBNR reserves plus expected development on reported claims $ 158        
Cumulative number of reported claims | claim 720,102        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 3,402 3,299 $ 2,589    
Homeowners | Accident Year 2016          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 4,001 3,972      
IBNR reserves plus expected development on reported claims $ 319        
Cumulative number of reported claims | claim 809,045        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 3,682 $ 2,950      
Homeowners | Accident Year 2017          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 4,490        
IBNR reserves plus expected development on reported claims $ 1,260        
Cumulative number of reported claims | claim 840,254        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 3,230