Investments (Contractholder-Directed Equity Securities and FVO Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI, Cost	$ 9,770	$ 9,886
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses)	1,648	2,256
Contractholder-directed equity securities and fair value option securities, at estimated fair value	11,418	12,142
Unit-linked investments
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI, Cost	8,509	8,643
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses)	1,332	1,897
Contractholder-directed equity securities and fair value option securities, at estimated fair value	9,841	10,540
FVO Securities
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI, Cost	1,261	1,243
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses)	316	359
Contractholder-directed equity securities and fair value option securities, at estimated fair value	$ 1,577	$ 1,602