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Segment Information (Operating Income of Reportable Segments) (Reconciling Items) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
(Gains) Losses On Assets Supporting Experience-Rated Contractholder Liabilities, Net $ 503 $ (1,128) $ (299)
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Terminated hedges of foreign currency earnings (32) 22 33
Current period yield adjustments 467 515 526
Principal source of earnings 1 245 96
Investments carried at fair value through net income 754 (1,562) (123)
Foreign currency exchange movements (123) 286 30
Other activities $ (37) $ (33) $ (33)