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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | $ 459 | $ 15 | $ 604 | $ (226)
Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 237 | (33) | 379 | (69)
Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 132 | 30 | 122 | (173)
Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (2) | 1 | (9) | (17)
Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 92 | 18 | 111 | 33
Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 3 | 1 | 4 | 2
Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (3) | (2) | (3) | (2)
Non-catastrophe losses |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 408 | (22) | 566 | (20)
Non-catastrophe losses | Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 275 | (29) | 426 | (46)
Non-catastrophe losses | Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 47 | (7) | 44 | (2)
Non-catastrophe losses | Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (5) | (3) | (16) | (3)
Non-catastrophe losses | Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 91 | 18 | 111 | 31
Non-catastrophe losses | Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 3 | 1 | 4 | 2
Non-catastrophe losses | Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (3) | (2) | (3) | (2)
Catastrophe |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 51 | 37 | 38 | (206)
Catastrophe | Nationwide Aggregate Reinsurance Program |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years |  | 50 |  | 200
Catastrophe | Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (38) | (4) | (47) | (23)
Catastrophe | Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 85 | 37 | 78 | (171)
Catastrophe | Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 3 | 4 | 7 | (14)
Catastrophe | Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 1 | 0 | 0 | 2
Catastrophe | Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 0 | 0 | 0 | 0
Catastrophe | Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | $ 0 | $ 0 | $ 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 https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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