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Reserve for Property-Liability Insurance Claims and Claims Expense - Reconciliation of total claims and claims expense incurred and paid by coverage (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Increase (decrease) in claims and claims expense |  |  |
Incurred | $ 23,976 | $ 22,778 | $ 21,847
Paid | (23,444) | (22,364) | (21,076)
Claims incurred and paid from before 2015 |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | (97) |  |
Paid | (444) |  |
Auto insurance - liability coverage |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 9,142 |  |
Paid | (8,419) |  |
Auto insurance - physical damage coverage |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 5,576 |  |
Paid | (5,570) |  |
Homeowners |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 4,625 |  |
Paid | (4,616) |  |
Total auto and homeowners insurance |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 19,343 |  |
Paid | (18,605) |  |
Other personal lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 1,024 |  |
Paid | (1,059) |  |
Commercial lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 648 |  |
Paid | (404) |  |
Service Businesses |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 297 |  |
Paid | (311) |  |
Unallocated loss adjustment expenses (“ULAE”) |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 2,687 |  |
Paid | (2,585) |  |
Other |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | (17) |  |
Paid | 85 |  |
Discontinued Lines and Coverages |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 91 |  |
Paid | (121) |  |
Catastrophes |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | $ 2,560 | $ 2,860 | $ 3,230

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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