General (Effects of Adoption of ASU 2018-12, Operations) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022		Sep. 30, 2023	Sep. 30, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance claims and policyholders' benefits	$ 1,826	$ 1,880	[1]	$ 5,258	$ 4,959	[1]
Income (loss) before income tax	326	(51)	[1]	1,058	531	[1]
Income tax (expense) benefit	68	(9)	[1]	220	88	[1]
Net income (loss)	$ 258	$ (42)	[1],[2]	$ 838	$ 443	[1],[3]
Basic earnings (loss) per share (in usd per share)	$ 0.95	$ (0.15)	[1]	$ 3.09	$ 1.63	[1]
Diluted earnings (loss) per share (in usd per share)	$ 0.95	$ (0.15)	[1]	$ 3.08	$ 1.63	[1]
Insurance claims and policyholders benefits, including policyholders' dividends, remeasurement impact	$ (41)	$ (211)		$ (75)	$ (205)
Prior to Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance claims and policyholders' benefits		1,665			4,703
Income (loss) before income tax		164			787
Income tax (expense) benefit		36			141
Net income (loss)		$ 128			$ 646
Basic earnings (loss) per share (in usd per share)		$ 0.47			$ 2.38
Diluted earnings (loss) per share (in usd per share)		$ 0.47			$ 2.37
Effect of Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance claims and policyholders' benefits		$ 215			$ 256
Income (loss) before income tax		(215)			(256)
Income tax (expense) benefit		(45)			(53)
Net income (loss)		$ (170)			$ (203)
Basic earnings (loss) per share (in usd per share)		$ (0.62)			$ (0.75)
Diluted earnings (loss) per share (in usd per share)		$ (0.62)			$ (0.74)

[1] As of January 1, 2023, the Company adopted ASU 2018-12, Financial Services-Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts (ASU 2018-12) using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance. See Note A to the Condensed Consolidated Financial Statements for additional information.

[2] As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance. See Note A to the Condensed Consolidated Financial Statements for additional information.

[3] As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance. See Note A to the Condensed Consolidated Financial Statements for additional information.