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Commitments, Guarantees and Contingent Liabilities - FAIR Plan Association (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 01, 2025 | Dec. 31, 2025 | Jun. 30, 2025 | Feb. 11, 2025
California Fair Plan Association |  |  |  |
Loss Contingencies |  |  |  |
Maximum possible assessment |  | $ 1,000 |  | $ 1,000
Insurance recoupment (as a percent) |  |  |  | 50.00%
Insurance recoupment after exceeding threshold amount (as a percent) |  |  |  | 100.00%
Maximum possible assessment paid (as a percent) |  | 50.00% |  |
Fair plan capital balance |  |  | $ 444 |
Catastrophe reinsurance aggregate loss limit | $ 7,100 |  |  |
Retention amount for catastrophe reinsurance agreement contracts | 1,250 |  |  |
Catastrophe reinsurance agreement contracts, amount to be obtained from reinsurance | $ 3,460 |  |  |
California Fair Plan Association | Personal Lines |  |  |  |
Loss Contingencies |  |  |  |
Market share (as a percent) |  |  |  | 4.60%
Maximum possible assessment paid |  | $ 45 |  |
California Fair Plan Association | Commercial Lines |  |  |  |
Loss Contingencies |  |  |  |
Market share (as a percent) |  |  |  | 2.00%
Texas Windstorm Insurance Association |  |  |  |
Loss Contingencies |  |  |  |
Market share (as a percent) |  | 12.80% |  |

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