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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, 2021 | Sep. 30, 2020
Increase (decrease) in claims and claims expense |  |
Prior years | $ (65) | $ (440)
Auto |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 3 | (101)
Homeowners |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (156) | (440)
Other personal lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (83) | (66)
Commercial lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 58 | 29
Run-off Property-Liability |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 115 | 139
Unfavorable reestimates | 111 |
Protection Services |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (2) | (1)
Non-catastrophe losses |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 142 | 62
Non-catastrophe losses | Auto |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 31 | (60)
Non-catastrophe losses | Homeowners |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 12 | (19)
Non-catastrophe losses | Other personal lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (69) | (25)
Non-catastrophe losses | Commercial lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 55 | 28
Non-catastrophe losses | Run-off Property-Liability |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 115 | 139
Non-catastrophe losses | Protection Services |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (2) | (1)
Catastrophe |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (207) | (502)
Catastrophe | Nationwide Aggregate Reinsurance Program |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 240 |
Catastrophe | PG&E And Southern California Edison |  |
Increase (decrease) in claims and claims expense |  |
Prior years |  | 495
Catastrophe | Auto |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (28) | (41)
Catastrophe | Homeowners |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (168) | (421)
Catastrophe | Other personal lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (14) | (41)
Catastrophe | Commercial lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 3 | 1
Catastrophe | Run-off Property-Liability |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 0 | 0
Catastrophe | Protection Services |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 0 | $ 0
Fire | Southern California Edison |  |
Increase (decrease) in claims and claims expense |  |
Prior years | $ 110 |

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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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