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Reserve for Property and Casualty Insurance Claims and Claims Expense - Schedule of Prior Year Reserve Re-estimates Included in Claims and Claims Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | $ 183 | $ 866 | $ 380 | $ 1,470
Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 33 | 632 | 105 | 1,011
Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 62 | 53 | 136 | 181
Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (14) | (5) | (8) | (14)
Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 19 | 64 | 51 | 175
Other business lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 1 | 2 | 12 | (4)
Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 82 | 120 | 85 | 124
Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 0 | 0 | (1) | (3)
Catastrophe losses |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 17 | (9) | 6 | 29
Catastrophe losses | Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 6 | (11) | (41) | (58)
Catastrophe losses | Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 16 | 3 | 61 | 77
Catastrophe losses | Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (11) | (3) | (23) | 4
Catastrophe losses | Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 6 | 1 | 9 | 1
Catastrophe losses | Other business lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 0 | 1 | 0 | 5
Catastrophe losses | Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 0 | 0 | 0 | 0
Catastrophe losses | Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 0 | 0 | 0 | 0
Non-catastrophe losses |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 166 | 875 | 374 | 1,441
Non-catastrophe losses | Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 27 | 643 | 146 | 1,069
Non-catastrophe losses | Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 46 | 50 | 75 | 104
Non-catastrophe losses | Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (3) | (2) | 15 | (18)
Non-catastrophe losses | Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 13 | 63 | 42 | 174
Non-catastrophe losses | Other business lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 1 | 1 | 12 | (9)
Non-catastrophe losses | Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 82 | 120 | 85 | 124
Non-catastrophe losses | Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 0 | 0 | (1) | (3)
Annual Reserve Review | Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | $ 80 | $ 118 | $ 80 | $ 118

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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 -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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