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Commitments, Guarantees and Contingent Liabilities - FAIR Plan Association (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Feb. 11, 2025
Dec. 31, 2024
California Fair Plan Association      
Loss Contingencies      
Fair plan capital balance $ 385    
Catastrophe reinsurance aggregate loss limit 5,720    
Retention amount for catastrophe reinsurance agreement contracts 900    
Catastrophe reinsurance agreement contracts, amount to be obtained from reinsurance 2,280    
Maximum possible assessment $ 1,000    
Insurance recoupment (as a percent) 50.00%    
Property insurance (as a percent) 100.00%    
California Fair Plan Association | Personal Lines | Subsequent Event      
Loss Contingencies      
Maximum possible assessment   $ 1,000  
Market share (as a percent)   4.60%  
California Fair Plan Association | Commercial Lines | Subsequent Event      
Loss Contingencies      
Market share (as a percent)   2.00%  
Texas Windstorm Insurance Association      
Loss Contingencies      
Market share (as a percent)     12.80%