Quarterly Financial Data (Unaudited) (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]
Core income (loss)	$ 265	$ 43	$ 230	$ 298	$ 1,284	$ 836		$ 1,088
Net income (loss)	239	(42)	190	295	1,205	682	[1]	1,184	[1]
Other comprehensive income (loss), net of tax	$ 405	$ (840)	$ (783)	$ (1,020)	$ 926	$ (2,238)	[1]	$ 177	[1]
Diluted earnings (loss) per share, Core income (loss) (in usd per share)	$ 0.97	$ 0.16	$ 0.84	$ 1.09
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]
Liability for future policy benefits, gross premium valuation, pretax margin		$ 125
Prior to Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Core income (loss)	$ 274	213	$ 245	$ 316		$ 1,048
Net income (loss)	248	128	205	313		894		$ 1,202
Other comprehensive income (loss), net of tax	$ 582	$ (1,426)	$ (1,410)	$ (1,623)		$ (3,877)		$ (483)
Diluted earnings (loss) per share, Core income (loss) (in usd per share)	$ 1.01	$ 0.78	$ 0.90	$ 1.16
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]
Core income (loss)	$ (9)	$ (170)	$ (15)	$ (18)		$ (212)
Net income (loss)	(9)	(170)	(15)	(18)		(212)		$ (18)
Other comprehensive income (loss), net of tax	$ (177)	$ 586	$ 627	$ 603		$ 1,639		$ 660
Diluted earnings (loss) per share, Core income (loss) (in usd per share)	$ (0.04)	$ (0.62)	$ (0.06)	$ (0.07)
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.