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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%