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Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Item
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2015
USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Current year losses $ 8,102 $ 7,400 $ 6,149  
Prior year losses (2) (9) 401  
Reinsurance recoverable for paid and unpaid losses $ 2,200 2,100    
Contracts of insurance and reinsurance received claims during the past three years, in years 20 years      
Business acquisition, cost of acquired entity and operations, cash paid       $ 140
Liabilities retroceded, percentage       100.00%
Maximum liability retroceded   450   $ 440
Increase (decrease) in A&E reserves $ 138      
Decrease in amount of liabilities retroceded   43    
Total amount of liabilities retroceded       $ 300
Number of exposure groupings | Item 200      
Other Retrocessionaire [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Concentration risk, percentage 5.00%      
Catastrophe Losses [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Current year losses $ (80) 710    
Covid-19 [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Current year losses     $ 511  
Higher Premiums Earned [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Current year losses 45 $ 541    
Munich Reinsurance Company [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Reinsurance recoverable for paid and unpaid losses $ 283      
Munich Reinsurance Company [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Concentration risk, percentage 12.60%      
Endurance Re [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Reinsurance recoverable for paid and unpaid losses $ 148      
Endurance Re [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Concentration risk, percentage 6.60%      
Mt Logan Re [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Reinsurance recoverable for paid and unpaid losses $ 520      
Mt Logan Re [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Concentration risk, percentage 23.20%