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Future Policy Benefits (Rollforward of Unpaid Claims) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]      
Balance at January 1, $ 16,098 $ 15,598 $ 14,698
Less: Reinsurance recoverables 2,452 2,629 1,896
Net Balance at January 1, 13,646 12,969 12,802
Incurred related to:      
Current year 27,080 26,505 26,903
Prior years 374 668 922
Total incurred 27,454 27,173 27,825
Paid related to:      
Current year (20,220) (19,917) (21,027)
Prior years (7,004) (6,579) (6,512)
Total paid (27,224) (26,496) (27,539)
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustments 15,546    
Net Balance at December 31, 13,876 13,646 12,969
Add: Reinsurance recoverables 2,592 2,452 2,629
Balance at December 31, 16,468 16,098 15,598
Disposal Group, Held-for-sale, Not Discontinued Operations      
Paid related to:      
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustments 0 0 (55)
Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Paid related to:      
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustments $ 0 $ 0 $ (64)