Summary of Significant Accounting Policies (Effects of Adoption of ASU 2018-12, Comprehensive Income (Loss)) (Details) - USD ($) $ 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]
Net unrealized gains and losses on investments					$ 1,120	$ (6,102)	[1]	$ (989)	[1]
Impact of changes in discount rates used to measure long-duration contract liabilities					(318)	3,959	[1]	941	[1]
Other comprehensive income (loss)	$ 405	$ (840)	$ (783)	$ (1,020)	926	(2,238)	[1]	177	[1]
Total comprehensive income (loss)					2,131	(1,556)	[1]	1,361	[1]
Net unrealized gains and losses on other investments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net unrealized gains and losses on investments					$ 1,125	(6,097)	[1]	(987)	[1]
Prior to Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net unrealized gains and losses on investments						(3,782)		(708)
Impact of changes in discount rates used to measure long-duration contract liabilities						0		0
Other comprehensive income (loss)	582	(1,426)	(1,410)	(1,623)		(3,877)		(483)
Total comprehensive income (loss)						(2,983)		719
Prior to Adoption | Net unrealized gains and losses on other investments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net unrealized gains and losses on investments						(3,777)		(706)
Effect of Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net unrealized gains and losses on investments						(2,320)		(281)
Impact of changes in discount rates used to measure long-duration contract liabilities						3,959		941
Other comprehensive income (loss)	$ (177)	$ 586	$ 627	$ 603		1,639		660
Total comprehensive income (loss)						1,427		642
Effect of Adoption | Net unrealized gains and losses on other investments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net unrealized gains and losses on investments						$ (2,320)		$ (281)

[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.