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Policy Claims and Benefits (Reconciliation of Claims Development to Liability) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments $ 439 $ 556 $ 641 $ 564
Short-duration Insurance Contract, Discounted Liability, Discount 80      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item 2,492      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Aggregate Reconciling Items 5,152      
Liability for Claims and Claims Adjustment Expense 7,644 $ 8,053 $ 7,556 $ 6,786
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 309      
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 768      
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 259      
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 1,236      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 10      
Short-duration Insurance Contract, Discounted Liability, Discount for Reinsurance (97)      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense 7      
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] 507      
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] $ 729      
[1] 2013 – 2021 unaudited.