General (Effects of Adoption of ASU 2018-12, Operations) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022		Jun. 30, 2023	Jun. 30, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance claims and policyholders' benefits	$ 1,779	$ 1,601	[1]	$ 3,432	$ 3,079	[1]
Income (loss) before income tax	361	227	[1]	732	582	[1]
Income tax (expense) benefit	78	37	[1]	152	97	[1]
Net income	$ 283	$ 190	[1],[2]	$ 580	$ 485	[3]
Basic earnings (loss) per share (in usd per share)	$ 1.04	$ 0.70	[1]	$ 2.14	$ 1.79
Diluted earnings (loss) per share (in usd per share)	$ 1.04	$ 0.69	[1]	$ 2.13	$ 1.78
Insurance claims and policyholders benefits, including policyholders' dividends, remeasurement impact	$ (33)	$ 1		$ (34)	$ 6
Prior to Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance claims and policyholders' benefits		1,583			3,038
Income (loss) before income tax		245			623
Income tax (expense) benefit		40			105
Net income		$ 205			$ 518
Basic earnings (loss) per share (in usd per share)		$ 0.75			$ 1.91
Diluted earnings (loss) per share (in usd per share)		$ 0.75			$ 1.90
Effect of Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance claims and policyholders' benefits		$ 18			$ 41
Income (loss) before income tax		(18)			(41)
Income tax (expense) benefit		(3)			(8)
Net income		$ (15)			$ (33)
Basic earnings (loss) per share (in usd per share)		$ (0.05)			$ (0.12)
Diluted earnings (loss) per share (in usd per share)		$ (0.06)			$ (0.12)

[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.