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Investments (Contractholder-Directed Equity Securities and FVO Securities) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI, Cost $ 9,106 $ 9,886
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses) 562 2,256
Contractholder-directed equity securities and fair value option securities, at estimated fair value 9,668 12,142
Unit-linked investments    
Debt and Equity Securities, FV-NI [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI, Cost 7,945 8,643
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses) 288 1,897
Contractholder-directed equity securities and fair value option securities, at estimated fair value 8,233 10,540
FVO Securities    
Debt and Equity Securities, FV-NI [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI, Cost 1,161 1,243
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses) 274 359
Contractholder-directed equity securities and fair value option securities, at estimated fair value $ 1,435 $ 1,602