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Claim and Claim Adjustment Expense Reserves (International - Short Duration Contracts) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total net liability for unpaid claim and claim adjustment expenses $ 18,163 $ 16,929 $ 16,300 $ 15,857
International        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total net liability for unpaid claim and claim adjustment expenses 2,276 $ 2,003    
Excluding Hardy | International        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total net liability for unpaid claim and claim adjustment expenses 1,655      
Hardy | International        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total net liability for unpaid claim and claim adjustment expenses $ 621