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Claim and Claim Adjustment Expense Reserves (Commercial - General Liability - Net Incurred Claims and Allocated Claim Adjustment Expenses) (Details) - General Liability - Commercial
$ in Millions
Dec. 31, 2023
USD ($)
claim
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 7,639                  
IBNR 2,821                  
2014                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net 679 $ 676 $ 659 $ 659 $ 658 $ 635 $ 631 $ 654 $ 658 $ 653
IBNR $ 28                  
Cumulative Number of Claims | claim 28,196                  
2015                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 639 625 617 602 600 589 574 576 $ 581  
IBNR $ 28                  
Cumulative Number of Claims | claim 24,261                  
2016                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 704 684 683 673 671 667 659 $ 623    
IBNR $ 39                  
Cumulative Number of Claims | claim 24,803                  
2017                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 690 652 630 634 632 632 $ 632      
IBNR $ 36                  
Cumulative Number of Claims | claim 22,471                  
2018                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 679 650 639 646 644 $ 653        
IBNR $ 129                  
Cumulative Number of Claims | claim 20,425                  
2019                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 720 691 682 682 $ 680          
IBNR $ 174                  
Cumulative Number of Claims | claim 19,647                  
2020                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 736 726 722 $ 723            
IBNR $ 347                  
Cumulative Number of Claims | claim 14,593                  
2021                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 793 784 $ 782              
IBNR $ 401                  
Cumulative Number of Claims | claim 15,121                  
2022                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 928 $ 929                
IBNR $ 676                  
Cumulative Number of Claims | claim 15,754                  
2023                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 1,071                  
IBNR $ 963                  
Cumulative Number of Claims | claim 11,633