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Claim and Claim Adjustment Expense Reserves (Gross and Net Carried Claim and Claim Adjustment Expense Reserves) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]        
Gross Case Reserves $ 7,738 $ 7,577    
Gross IBNR Reserves 15,566 14,543    
Total Gross Carried Claim and Claim Adjustment Expense Reserves 23,304 22,120 $ 21,269 $ 19,862
Net Case Reserves 5,663 5,509    
Net IBNR Reserves 12,500 11,420    
Total Net Carried Claim and Claim Adjustment Expense Reserves 18,163 16,929 $ 16,300 $ 15,857
Specialty        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Gross Case Reserves 1,604 1,529    
Gross IBNR Reserves 5,527 5,349    
Total Gross Carried Claim and Claim Adjustment Expense Reserves 7,131 6,878    
Net Case Reserves 1,392 1,310    
Net IBNR Reserves 4,524 4,253    
Total Net Carried Claim and Claim Adjustment Expense Reserves 5,916 5,563    
Commercial        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Gross Case Reserves 3,291 3,156    
Gross IBNR Reserves 6,812 6,239    
Total Gross Carried Claim and Claim Adjustment Expense Reserves 10,103 9,395    
Net Case Reserves 2,878 2,809    
Net IBNR Reserves 6,143 5,621    
Total Net Carried Claim and Claim Adjustment Expense Reserves 9,021 8,430    
International        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Gross Case Reserves 864 817    
Gross IBNR Reserves 1,845 1,586    
Total Gross Carried Claim and Claim Adjustment Expense Reserves 2,709 2,403    
Net Case Reserves 708 686    
Net IBNR Reserves 1,568 1,317    
Total Net Carried Claim and Claim Adjustment Expense Reserves 2,276 2,003    
Life & Group        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Gross Case Reserves 626 647    
Gross IBNR Reserves 49 48    
Total Gross Carried Claim and Claim Adjustment Expense Reserves 675 695    
Net Case Reserves 556 567    
Net IBNR Reserves 26 27    
Total Net Carried Claim and Claim Adjustment Expense Reserves 582 594    
Corporate & Other        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Gross Case Reserves 1,353 1,428    
Gross IBNR Reserves 1,333 1,321    
Total Gross Carried Claim and Claim Adjustment Expense Reserves 2,686 2,749    
Net Case Reserves 129 137    
Net IBNR Reserves 239 202    
Total Net Carried Claim and Claim Adjustment Expense Reserves $ 368 $ 339