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Reserve For Losses, LAE And Future Policy Benefit Reserve (Reconciliation of the Net Incurred and Paid Claims Development) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]        
Liabilities for claims and claim adjustment expenses, net of reinsurance $ 19,671      
Total reinsurance recoverable on unpaid claims 2,105 $ 1,946    
Unallocated claims adjustment expenses 244      
Other 45      
Total expenses 289      
Total gross liability for unpaid claims and claim adjustment expense 22,065 $ 19,009 $ 16,322 $ 13,531
Reinsurance [Member] | Casualty Business [Member]        
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]        
Liabilities for claims and claim adjustment expenses, net of reinsurance 9,715      
Total reinsurance recoverable on unpaid claims 150      
Reinsurance [Member] | Property Business [Member]        
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]        
Liabilities for claims and claim adjustment expenses, net of reinsurance 5,562      
Total reinsurance recoverable on unpaid claims 576      
Insurance [Member] | Casualty Business [Member]        
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]        
Liabilities for claims and claim adjustment expenses, net of reinsurance 3,828      
Total reinsurance recoverable on unpaid claims 1,220      
Insurance [Member] | Property Business [Member]        
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]        
Liabilities for claims and claim adjustment expenses, net of reinsurance 566      
Total reinsurance recoverable on unpaid claims $ 160