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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 |  |  |  |

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