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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 | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Increase (decrease) in claims and claims expense |  |
Prior years | $ (226) | $ (3)
Auto |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (69) | (41)
Homeowners |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (173) | 16
Other personal lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (17) | (8)
Commercial lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 33 | 27
Run-off Property-Liability |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 2 | 4
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 | (20) | (8)
Non-catastrophe losses | Auto |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (46) | (26)
Non-catastrophe losses | Homeowners |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (2) | (3)
Non-catastrophe losses | Other personal lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (3) | (6)
Non-catastrophe losses | Commercial lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 31 | 24
Non-catastrophe losses | Run-off Property-Liability |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 2 | 4
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 | (206) | 5
Catastrophe | Nationwide Aggregate Reinsurance Program |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 200 |
Catastrophe | Auto |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (23) | (15)
Catastrophe | Homeowners |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (171) | 19
Catastrophe | Other personal lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | (14) | (2)
Catastrophe | Commercial lines |  |
Increase (decrease) in claims and claims expense |  |
Prior years | 2 | 3
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 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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