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Reserves for Loss and Loss Expenses (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net of loss reserves discount $ 22,000,000   $ 26,000,000 $ 22,000,000
Increase (decrease) in estimates for claims     7,000,000 (6,000,000)
Adjustment expense   $ 24,000,000 2,000,000 21,000,000
Liability recognized for best estimate net of reinsurance     388,000,000  
Liability recognized for best estimate net of reinsurance, reported losses     385,000,000  
Liability recognized for best estimate net of reinsurance, incurred but not reported (IBNR)     3,000,000  
Insurance        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Liability recognized for best estimate net of reinsurance     329,000,000  
Unfavorable reserve development net of premium offsets     5,000,000 19,000,000
Reinsurance & Monoline Excess        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Liability recognized for best estimate net of reinsurance     59,000,000  
Unfavorable reserve development net of premium offsets       $ 2,000,000
Favorable reserve development net of premium offsets $ 3,000,000   $ 7,000,000