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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, 2018 USD ($) claim | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Increase (decrease) in claims and claims expense |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of recoverables | $ 20,268 |  |  |  |
Auto insurance - liability coverage |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 42,043 |  |  |  |
Prior year reserve reestimates | (293) |  |  |  |
Prior Year Reserve Estimates | (329) |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | 30,122 |  |  |  |
All outstanding liabilities before 2014, net of recoverables | 1,259 |  |  |  |
Liabilities for claims and claim adjustment expenses, net of recoverables | 13,180 |  |  |  |
Auto insurance - liability coverage | Accident Year 2014 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 7,661 | $ 7,727 | $ 7,797 | $ 7,833 | $ 7,727
Prior year reserve reestimates | (66) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 471 |  |  |  |
Cumulative number of reported claims | claim | 2,195,241 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 7,190 | 6,813 | 6,247 | 5,308 | 3,168
Auto insurance - liability coverage | Accident Year 2015 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 8,596 | 8,656 | 8,711 | 8,741 |
Prior year reserve reestimates | (60) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 1,044 |  |  |  |
Cumulative number of reported claims | claim | 2,382,914 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 7,552 | 6,872 | 5,828 | 3,518 |
Auto insurance - liability coverage | Accident Year 2016 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 8,711 | 8,811 | 9,007 |  |
Prior year reserve reestimates | (100) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 1,873 |  |  |  |
Cumulative number of reported claims | claim | 2,396,876 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 6,838 | 5,759 | 3,479 |  |
Auto insurance - liability coverage | Accident Year 2017 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 8,369 | 8,436 |  |  |
Prior year reserve reestimates | (67) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 3,049 |  |  |  |
Cumulative number of reported claims | claim | 2,204,093 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 5,320 | 3,143 |  |  |
Auto insurance - liability coverage | Accident Year 2018 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 8,706 |  |  |  |
IBNR reserves plus expected development on reported claims | $ 5,484 |  |  |  |
Cumulative number of reported claims | claim | 2,075,655 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 3,222 |  |  |  |
Auto insurance - liability coverage | Unallocated loss adjustment expenses (“ULAE”) |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Prior Year Reserve Estimates | 8 |  |  |  |
Auto insurance - liability coverage | Claims incurred and paid from before 2014 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Prior Year Reserve Estimates | (43) |  |  |  |
Auto insurance - physical damage coverage |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 24,168 |  |  |  |
Prior year reserve reestimates | (119) |  |  |  |
Prior Year Reserve Estimates | (126) |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | 23,906 |  |  |  |
All outstanding liabilities before 2014, net of recoverables | 9 |  |  |  |
Liabilities for claims and claim adjustment expenses, net of recoverables | 271 |  |  |  |
Auto insurance - physical damage coverage | Accident Year 2014 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 4,260 | 4,261 | 4,258 | 4,284 | 4,296
Prior year reserve reestimates | (1) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 3 |  |  |  |
Cumulative number of reported claims | claim | 4,144,633 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 4,257 | 4,258 | 4,261 | 4,269 | 4,137
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 | 4,654 | 4,663 | 4,675 | 4,646 |
Prior year reserve reestimates | (9) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 6 |  |  |  |
Cumulative number of reported claims | claim | 4,389,912 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 4,648 | 4,652 | 4,665 | 4,501 |
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 | 5,018 | 5,045 | 5,118 |  |
Prior year reserve reestimates | (27) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 6 |  |  |  |
Cumulative number of reported claims | claim | 4,430,776 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 5,012 | 5,024 | 4,881 |  |
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 | 5,029 | 5,111 |  |  |
Prior year reserve reestimates | (82) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 1 |  |  |  |
Cumulative number of reported claims | claim | 4,232,605 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 5,029 | 4,838 |  |  |
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 | 5,207 |  |  |  |
IBNR reserves plus expected development on reported claims | $ 246 |  |  |  |
Cumulative number of reported claims | claim | 4,150,524 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 4,960 |  |  |  |
Auto insurance - physical damage coverage | Unallocated loss adjustment expenses (“ULAE”) |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Prior Year Reserve Estimates | (5) |  |  |  |
Auto insurance - physical damage coverage | Claims incurred and paid from before 2014 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Prior Year Reserve Estimates | (3) |  |  |  |
Homeowners |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 20,430 |  |  |  |
Prior year reserve reestimates | 78 |  |  |  |
Prior Year Reserve Estimates | 14 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | 18,526 |  |  |  |
All outstanding liabilities before 2014, net of recoverables | 140 |  |  |  |
Liabilities for claims and claim adjustment expenses, net of recoverables | 2,044 |  |  |  |
Homeowners | Accident Year 2014 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 3,599 | 3,609 | 3,640 | 3,636 | 3,589
Prior year reserve reestimates | (10) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 52 |  |  |  |
Cumulative number of reported claims | claim | 765,329 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 3,547 | 3,524 | 3,472 | 3,356 | $ 2,729
Homeowners | Accident Year 2015 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 3,532 | 3,548 | 3,607 | 3,553 |
Prior year reserve reestimates | (16) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 79 |  |  |  |
Cumulative number of reported claims | claim | 720,955 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 3,453 | 3,394 | 3,291 | $ 2,583 |
Homeowners | Accident Year 2016 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 3,949 | 3,987 | 3,952 |  |
Prior year reserve reestimates | (38) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 147 |  |  |  |
Cumulative number of reported claims | claim | 812,785 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 3,802 | 3,672 | $ 2,942 |  |
Homeowners | Accident Year 2017 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 4,611 | 4,469 |  |  |
Prior year reserve reestimates | 142 |  |  |  |
IBNR reserves plus expected development on reported claims | $ 370 |  |  |  |
Cumulative number of reported claims | claim | 902,301 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 4,241 | $ 3,222 |  |  |
Homeowners | Accident Year 2018 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 4,739 |  |  |  |
IBNR reserves plus expected development on reported claims | $ 1,256 |  |  |  |
Cumulative number of reported claims | claim | 743,408 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 3,483 |  |  |  |
Homeowners | Unallocated loss adjustment expenses (“ULAE”) |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Prior Year Reserve Estimates | (50) |  |  |  |
Homeowners | Claims incurred and paid from before 2014 |  |  |  |  |
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 | 1,356 |  |  |  |
Commercial lines |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of recoverables | 766 |  |  |  |
Service Businesses |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of recoverables | 50 |  |  |  |
Discontinued Lines and Coverages |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of recoverables | 1,315 |  |  |  |
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 | 1 |  |  |  |
Other | Homeowners |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Prior Year Reserve Estimates | $ 9 |  |  |  |

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