Investments (Contractholder-Directed Equity Securities and FVO Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI, Cost	$ 9,163	$ 9,886
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses)	712	2,256
Contractholder-directed equity securities and fair value option securities, at estimated fair value	9,875	12,142
Unit-linked investments
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI, Cost	7,990	8,643
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses)	490	1,897
Contractholder-directed equity securities and fair value option securities, at estimated fair value	8,480	10,540
FVO Securities
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI, Cost	1,173	1,243
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses)	222	359
Contractholder-directed equity securities and fair value option securities, at estimated fair value	$ 1,395	$ 1,602