Investments (Contractholder-Directed Equity Securities and FVO Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI, Cost	$ 8,742	$ 9,106
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses)	1,589	562
Contractholder-directed equity securities and fair value option securities, at estimated fair value	10,331	9,668
Unit-linked investments
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI, Cost	7,770	7,945
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses)	1,112	288
Contractholder-directed equity securities and fair value option securities, at estimated fair value	8,882	8,233
FVO securities
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI, Cost	972	1,161
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses)	477	274
Contractholder-directed equity securities and fair value option securities, at estimated fair value	$ 1,449	$ 1,435