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Unpaid Claims and Claim Expense Short Duration Contracts (Reconciliation of Claims Development to Liability) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments $ 80 $ 57 $ 81
Short-duration Insurance Contract, Discounted Liability, Discount 83    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 2,730    
Liability for Claims and Claims Adjustment Expense 2,730 $ 2,480 $ 2,110
Asia Pacific [Member]      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 119    
Canada Segment Reporting Information [Member]      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 378    
EMEA [Member]      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 833    
Americas [Member]      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 221    
Corporate And Other Segment Reporting Information [Member]      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 6    
Life Insurance Product Line [Member]      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 1,256    
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 11    
Short-duration Insurance Contract, Discounted Liability, Discount for Reinsurance (103)    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense 9    
Life Insurance Product Line [Member] | Asia Pacific [Member]      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [1] 509    
Life Insurance Product Line [Member] | Americas [Member]      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [1] $ 747    
[1] 2014 – 2022 unaudited.