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Property Casualty Loss And Loss Expenses (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property Casualty Insurance Underwriters        
Certain accident, life and health loss reserves $ 7,229,000,000 $ 6,677,000,000 $ 6,088,000,000 $ 5,646,000,000
Prior year claims and claims adjustments expense, (favorable) and unfavorable (428,000,000) (131,000,000) (248,000,000)  
Net loss and loss expense reserves for asbestos and environmental claims $ 88,000,000 $ 85,000,000    
Percentage of reserves for asbestos and environmental claims 2.00% 2.00%    
Maximum        
Property Casualty Insurance Underwriters        
Reinsurance retention $ 500,000      
Life and Health Loss Reserves        
Property Casualty Insurance Underwriters        
Certain accident, life and health loss reserves 76,000,000 $ 69,000,000 59,000,000  
Commercial Insurance        
Property Casualty Insurance Underwriters        
Prior year claims and claims adjustments expense, (favorable) and unfavorable (353,000,000) (95,000,000) (192,000,000)  
Commercial Insurance | Commercial Casualty Line        
Property Casualty Insurance Underwriters        
Certain accident, life and health loss reserves 2,360,000,000      
Prior year claims and claims adjustments expense, (favorable) and unfavorable (120,000,000) (54,000,000) (78,000,000)  
Commercial Insurance | Commercial Property Line        
Property Casualty Insurance Underwriters        
Certain accident, life and health loss reserves 483,000,000      
Prior year claims and claims adjustments expense, (favorable) and unfavorable (97,000,000) (16,000,000) (25,000,000)  
Commercial Insurance | Workers' Compensation Line        
Property Casualty Insurance Underwriters        
Certain accident, life and health loss reserves 1,010,000,000      
Prior year claims and claims adjustments expense, (favorable) and unfavorable (66,000,000) (39,000,000) (77,000,000)  
Commercial Insurance | Commercial Auto Line        
Property Casualty Insurance Underwriters        
Certain accident, life and health loss reserves 726,000,000      
Prior year claims and claims adjustments expense, (favorable) and unfavorable (43,000,000) 17,000,000 (6,000,000)  
Personal Insurance        
Property Casualty Insurance Underwriters        
Prior year claims and claims adjustments expense, (favorable) and unfavorable (50,000,000) (18,000,000) (27,000,000)  
Personal Insurance | Personal Auto        
Property Casualty Insurance Underwriters        
Certain accident, life and health loss reserves 292,000,000      
Prior year claims and claims adjustments expense, (favorable) and unfavorable (31,000,000) (15,000,000) (26,000,000)  
Personal Insurance | Homeowner        
Property Casualty Insurance Underwriters        
Prior year claims and claims adjustments expense, (favorable) and unfavorable (14,000,000) (5,000,000) 11,000,000  
Excess and Surplus Lines Insurance        
Property Casualty Insurance Underwriters        
Certain accident, life and health loss reserves 547,000,000      
Prior year claims and claims adjustments expense, (favorable) and unfavorable 7,000,000 7,000,000 (11,000,000)  
Reinsurance assumed and other non segment        
Property Casualty Insurance Underwriters        
Prior year claims and claims adjustments expense, (favorable) and unfavorable $ (32,000,000) $ (25,000,000) $ (18,000,000)