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Reserve for Property and Casualty Insurance Claims and Claims Expense - Schedule of Reconciliation of Total Claims and Claims Expense Incurred and Paid by Coverage (Details) - Property and casualty - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Increase (decrease) in claims and claims expense |  |  |
Incurred | $ 37,454 | $ 39,735 | $ 41,070
Paid | (37,702) | $ (37,882) | $ (37,973)
Claims incurred and paid from before 2021 |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | (15) |  |
Paid | (612) |  |
Auto insurance - liability coverage |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 14,575 |  |
Paid | (13,741) |  |
Auto insurance - physical damage coverage |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 7,459 |  |
Paid | (7,584) |  |
Homeowners insurance |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 8,852 |  |
Paid | (8,945) |  |
Total auto and homeowners insurance |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 30,886 |  |
Paid | (30,270) |  |
Other personal lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 2,281 |  |
Paid | (1,891) |  |
Commercial lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 145 |  |
Paid | (667) |  |
Other business lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 213 |  |
Paid | (254) |  |
Protection Services |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 604 |  |
Paid | (598) |  |
Run-off Property-Liability |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 123 |  |
Paid | (125) |  |
Unallocated loss adjustment expenses (“ULAE”) |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 3,241 |  |
Paid | (3,400) |  |
Other |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | (24) |  |
Paid | $ 115 |  |

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