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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | $ (203) | $ 212 | $ (354) | $ 197
Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (180) | 97 | (254) | 72
Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (191) | 94 | (380) | 74
Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 61 | 3 | 113 | 6
Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 107 | 8 | 158 | 32
Other business lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (1) | 10 | 4 | 11
Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 2 | 1 | 6 | 3
Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (1) | (1) | (1) | (1)
Catastrophe losses |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (138) | 31 | (300) | (11)
Catastrophe losses | Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (9) | (19) | (16) | (47)
Catastrophe losses | Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (128) | 53 | (277) | 45
Catastrophe losses | Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 1 | (5) | (2) | (12)
Catastrophe losses | Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (2) | 2 | (5) | 3
Catastrophe losses | Other business lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 0 | 0 | 0 | 0
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 | (65) | 181 | (54) | 208
Non-catastrophe losses | Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (171) | 116 | (238) | 119
Non-catastrophe losses | Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (63) | 41 | (103) | 29
Non-catastrophe losses | Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 60 | 8 | 115 | 18
Non-catastrophe losses | Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 109 | 6 | 163 | 29
Non-catastrophe losses | Other business lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (1) | 10 | 4 | 11
Non-catastrophe losses | Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 2 | 1 | 6 | 3
Non-catastrophe losses | Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | $ (1) | $ (1) | $ (1) | $ (1)

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