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Reserves for Loss and Loss Expenses (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net of loss reserve discounts $ 7 $ 5
Increase (decrease) in estimates for claims 4 (5)
Adjustment expense 1 3
Liability recognized for best estimate net of reinsurance 290  
Liability recognized for best estimate net of reinsurance, reported losses 268  
Liability recognized for best estimate net of reinsurance, incurred but not reported (IBNR) 22  
Liability recognized for best estimate net of reinsurance, current accident year losses 1  
Insurance    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Liability recognized for best estimate net of reinsurance 246  
Favorable reserve development net of premium offsets 6 6
Reinsurance & Monoline Excess    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Liability recognized for best estimate net of reinsurance 44  
Unfavorable reserve development net of premium offsets $ 5 $ 3