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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 |  |  |  |

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