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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | $ (370) | $ (203) | $ (621) | $ (354)
Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (431) | (180) | (680) | (254)
Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 30 | (191) | 22 | (380)
Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 30 | 61 | 76 | 113
Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 9 | 107 | (19) | 158
Other business lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (10) | (1) | (25) | 4
Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 2 | 2 | 5 | 6
Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 0 | (1) | 0 | (1)
Catastrophe losses |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 6 | (138) | (10) | (300)
Catastrophe losses | Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (16) | (9) | (27) | (16)
Catastrophe losses | Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 18 | (128) | 17 | (277)
Catastrophe losses | Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 2 | 1 | (5) | (2)
Catastrophe losses | Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 2 | (2) | 5 | (5)
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 | (376) | (65) | (611) | (54)
Non-catastrophe losses | Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (415) | (171) | (653) | (238)
Non-catastrophe losses | Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 12 | (63) | 5 | (103)
Non-catastrophe losses | Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 28 | 60 | 81 | 115
Non-catastrophe losses | Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 7 | 109 | (24) | 163
Non-catastrophe losses | Other business lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (10) | (1) | (25) | 4
Non-catastrophe losses | Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 2 | 2 | 5 | 6
Non-catastrophe losses | Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | $ 0 | $ (1) | 0 | $ (1)
Nationwide Reinsurance Program | Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years |  |  | $ 60 |

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