Adoption of ASU 2018-12 - Summary of Effect on Previously Reported Consolidated Statements of Comprehensive Income (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Fee income	$ 5,467	$ 5,603	$ 6,039
Realized gain (loss)	(4,311)	840	(867)
Total revenues	11,645	18,810	17,715
Expenses
Benefits	6,138	8,479	8,503
Interest credited	3,248	2,877	2,929
Market risk benefit (gain) loss	(2,264)	(3,246)	(3,753)
Policyholder liability remeasurement (gain) loss	(152)	2,766	(183)
Commissions and other expenses	5,339	5,125	5,219
Total expenses	12,793	17,085	13,072
Income (loss) before taxes	(1,148)	1,725	4,643
Federal income tax expense (benefit)	(396)	367	865
Net income (loss)	(752)	1,358	3,778
Unrealized investment gain (loss)	3,715	(18,059)	(3,287)
Market risk benefit non-performance risk gain (loss)	(671)	(210)	(923)
Policyholder liability discount rate remeasurement gain (loss)	(160)	2,012	591
Other comprehensive income (loss), net of tax	2,876	(16,336)	(3,574)
Comprehensive income (loss)	$ 2,124	$ (14,978)	$ 204
Net Income (Loss) Per Common Share
Basic (in dollars per share)	$ (4.92)	$ 7.93	$ 20.17
Diluted (in dollars per share)	$ (4.92)	$ 7.78	$ 19.96
As Previously Reported
Revenues
Fee income		$ 6,054	$ 6,905
Realized gain (loss)		345	414
Total revenues		18,766	19,862
Expenses
Benefits		12,546	8,529
Interest credited		2,870	2,933
Commissions and other expenses		5,096	5,794
Total expenses		21,596	17,613
Income (loss) before taxes		(2,830)	2,249
Federal income tax expense (benefit)		(589)	362
Net income (loss)		(2,241)	1,887
Unrealized investment gain (loss)		(14,030)	(2,535)
Other comprehensive income (loss), net of tax		(14,109)	(2,490)
Comprehensive income (loss)		$ (16,350)	$ (603)
Net Income (Loss) Per Common Share
Basic (in dollars per share)		$ (13.11)	$ 10.07
Diluted (in dollars per share)		$ (13.19)	$ 9.98
Adoption of New Accounting Standard | Accounting Standards Update 2018-12
Revenues
Fee income		$ (451)	$ (866)
Realized gain (loss)		495	(1,281)
Total revenues		44	(2,147)
Expenses
Benefits		(4,067)	(26)
Interest credited		7	(4)
Market risk benefit (gain) loss		(3,246)	(3,753)
Policyholder liability remeasurement (gain) loss		2,766	(183)
Commissions and other expenses		29	(575)
Total expenses		(4,511)	(4,541)
Income (loss) before taxes		4,555	2,394
Federal income tax expense (benefit)		956	503
Net income (loss)		3,599	1,891
Unrealized investment gain (loss)		(4,029)	(752)
Market risk benefit non-performance risk gain (loss)		(210)	(923)
Policyholder liability discount rate remeasurement gain (loss)		2,012	591
Other comprehensive income (loss), net of tax		(2,227)	(1,084)
Comprehensive income (loss)		$ 1,372	$ 807
Net Income (Loss) Per Common Share
Basic (in dollars per share)		$ 21.04	$ 10.10
Diluted (in dollars per share)		$ 20.97	$ 9.98