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Reserve for Property and Casualty Insurance Claims and Claims Expense - Schedule of Reconciliation of the Net Incurred and Paid Claims Development to Reserve for Property and Casualty Insurance Claims and Claims Expense (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Claims Development [Line Items] |  |  |  |
Reserve for property and casualty insurance claims and claims expense | $ 41,079 | $ 41,917 |  |
Property and casualty |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 33,067 |  |  |
ULAE | 1,551 |  |  |
Recoverables | 8,012 | 8,602 | $ 8,396 | $ 9,176
ULAE | 134 |  |  |
Reserve for property and casualty insurance claims and claims expense | 41,079 | $ 41,917 | $ 39,858 | $ 37,541
Auto insurance - liability coverage |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 21,521 |  |  |
Auto insurance - liability coverage | Property and casualty |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 21,521 |  |  |
Recoverables | 6,301 |  |  |
Auto insurance - physical damage coverage |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 597 |  |  |
Auto insurance - physical damage coverage | Property and casualty |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 597 |  |  |
Recoverables | 18 |  |  |
Homeowners insurance |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 4,122 |  |  |
Homeowners insurance | Property and casualty |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 4,122 |  |  |
Recoverables | 679 |  |  |
Other personal lines | Property and casualty |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 2,664 |  |  |
Recoverables | 204 |  |  |
Commercial lines | Property and casualty |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,133 |  |  |
Recoverables | 231 |  |  |
Other business lines | Property and casualty |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 93 |  |  |
Recoverables | 14 |  |  |
Protection Services | Property and casualty |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 60 |  |  |
Recoverables | 12 |  |  |
Run-off Property-Liability |  |  |  |
Claims Development [Line Items] |  |  |  |
Reserve for property and casualty insurance claims and claims expense | 761 |  |  |
Run-off Property-Liability | Property and casualty |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 1,326 |  |  |
Recoverables | 419 |  |  |
Other | Property and casualty |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | $ 0 |  |  |

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