Summary of Significant Accounting Policies (Effects of Adoption of ASU 2018-12, Operations) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance claims and policyholders' benefits					$ 7,068	$ 6,653	[1]	$ 6,371	[1]
Income (loss) before income tax					1,518	814	[1]	1,462	[1]
Income tax (expense) benefit					313	132	[1]	278	[1]
Net income	$ 239	$ (42)	$ 190	$ 295	$ 1,205	$ 682	[1]	$ 1,184	[1]
Basic earnings (loss) per share (in usd per share)					$ 4.44	$ 2.51	[1]	$ 4.36	[1]
Diluted earnings (loss) per share (in usd per share)	$ 0.87	$ (0.15)	$ 0.69	$ 1.08	$ 4.43	$ 2.51	[1]	$ 4.34	[1]
Insurance claims and policyholders benefits, including policyholders' dividends, remeasurement impact					$ (88)	$ (214)		$ (8)
Prior to Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance claims and policyholders' benefits						6,386		6,349
Income (loss) before income tax						1,081		1,484
Income tax (expense) benefit						187		282
Net income	$ 248	$ 128	$ 205	$ 313		$ 894		$ 1,202
Basic earnings (loss) per share (in usd per share)						$ 3.29		$ 4.42
Diluted earnings (loss) per share (in usd per share)	$ 0.91	$ 0.47	$ 0.75	$ 1.15		$ 3.28		$ 4.41
Effect of Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance claims and policyholders' benefits						$ 267		$ 22
Income (loss) before income tax						(267)		(22)
Income tax (expense) benefit						(55)		(4)
Net income	$ (9)	$ (170)	$ (15)	$ (18)		$ (212)		$ (18)
Basic earnings (loss) per share (in usd per share)						$ (0.78)		$ (0.06)
Diluted earnings (loss) per share (in usd per share)	$ (0.04)	$ (0.62)	$ (0.06)	$ (0.07)		$ (0.77)		$ (0.07)

[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 Consolidated Financial Statements for additional information.