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Reserve for Property and Casualty Insurance Claims and Claims Expense Reserve for Property and Casualty Insurance Claims and Claims Expense - Prior year reserve reestimates included in claims and claims expense (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Increase (decrease) in claims and claims expense |  |
Prior years | $ (118) | $ (135)
Auto |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (311) | (356)
Homeowners |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 59 | 46
Other personal lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 17 | (15)
Commercial lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 17 | 107
Discontinued Lines and Coverages |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 103 | 85
Unfavorable reestimates |  | 95
Service Businesses |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (3) | (2)
Non-catastrophes |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (171) | (180)
Non-catastrophes | Auto |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (302) | (319)
Non-catastrophes | Homeowners |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 0 | (38)
Non-catastrophes | Other personal lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 13 | (13)
Non-catastrophes | Commercial lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 18 | 107
Non-catastrophes | Discontinued Lines and Coverages |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 103 | 85
Non-catastrophes | Service Businesses |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (3) | (2)
Catastrophe |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 53 | 45
Catastrophe | Auto |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (9) | (37)
Catastrophe | Homeowners |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 59 | 84
Reinstatement reinsurance premiums | 13 |
Catastrophe | Other personal lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 4 | (2)
Catastrophe | Commercial lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (1) | 0
Catastrophe | Discontinued Lines and Coverages |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 0 | 0
Catastrophe | Service Businesses |  |
Increase (decrease) in claims and claims expense |  |
Prior years | $ 0 | $ 0

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- Definition Prior Year Claims and Claims Adjustment Expense, Reinstatement Reinsurance Premiums + References No definition available. + Details
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- Definition Prior Year Claims and Claims Adjustment Expense, Unfavorable Reestimate + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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