Investments (Contractholder-Directed Equity Securities and FVO Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI, Cost	$ 8,667	$ 9,106
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses)	1,013	562
Contractholder-directed equity securities and fair value option securities, at estimated fair value	9,680	9,668
Unit-linked investments
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI, Cost	7,581	7,945
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses)	625	288
Contractholder-directed equity securities and fair value option securities, at estimated fair value	8,206	8,233
FVO Securities
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI, Cost	1,086	1,161
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses)	388	274
Contractholder-directed equity securities and fair value option securities, at estimated fair value	$ 1,474	$ 1,435