Adoption of ASU 2018-12 - Summary of Effect on Previously Reported Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Fee income	$ 5,168	$ 5,366	$ 5,766
Realized gain (loss)	(4,934)	418	859
Total revenues	10,059	17,557	18,512
Expenses
Benefits	5,028	8,203	8,027
Interest credited	3,202	2,860	2,912
Market risk benefit (gain) loss	(1,135)	296	(1,554)
Policyholder liability remeasurement (gain) loss	(167)	2,445	(119)
Commissions and other expenses	5,249	4,927	5,011
Total expenses	12,520	19,669	14,478
Income (loss) before taxes	(2,461)	(2,112)	4,034
Federal income tax expense (benefit)	(673)	(437)	737
Net income (loss)	(1,788)	(1,675)	3,297
Other comprehensive income (loss), net of tax:
Unrealized investment gain (loss)	4,942	(17,639)	(3,233)
Market risk benefit gain (loss)		(211)	(923)
Policyholder liability discount rate remeasurement gain (loss)	(145)	1,891	560
Total other comprehensive income (loss), net of tax	4,128	(15,963)	(3,593)
Comprehensive income (loss)	$ 2,340	(17,638)	(296)
As Previously Reported
Revenues
Fee income		5,783	6,630
Realized gain (loss)		214	711
Total revenues		17,770	19,228
Expenses
Benefits		10,801	8,039
Interest credited		2,849	2,911
Commissions and other expenses		4,799	5,548
Total expenses		19,387	16,699
Income (loss) before taxes		(1,617)	2,529
Federal income tax expense (benefit)		(332)	420
Net income (loss)		(1,285)	2,109
Other comprehensive income (loss), net of tax:
Unrealized investment gain (loss)		(13,613)	(2,480)
Total other comprehensive income (loss), net of tax		(13,617)	(2,477)
Comprehensive income (loss)		(14,902)	(368)
Accounting Standards Update 2018-12 | Adoption of New Accounting Standard
Revenues
Fee income		(417)	(864)
Realized gain (loss)		204	148
Total revenues		(213)	(716)
Expenses
Benefits		(2,598)	(12)
Interest credited		11	1
Market risk benefit (gain) loss		296	(1,554)
Policyholder liability remeasurement (gain) loss		2,445	(119)
Commissions and other expenses		128	(537)
Total expenses		282	(2,221)
Income (loss) before taxes		(495)	1,505
Federal income tax expense (benefit)		(105)	317
Net income (loss)		(390)	1,188
Other comprehensive income (loss), net of tax:
Unrealized investment gain (loss)		(4,026)	(753)
Market risk benefit gain (loss)		(211)	(923)
Policyholder liability discount rate remeasurement gain (loss)		1,891	560
Total other comprehensive income (loss), net of tax		(2,346)	(1,116)
Comprehensive income (loss)		$ (2,736)	$ 72