Future Policy Benefit Reserves - Summary of Balances and Changes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Present value of future net premiums
Balance, January 1	$ 3,991	$ 4,735		$ 5,086
Effect of changes in discount rate	(125)	(74)		(880)	$ (1,140)
Balance, January 1, at original locked in discount rate	3,917	3,855		3,946
Effect of changes in cash flow assumptions		28		352	173
Expect of actual variances from expected experience		(126)		(49)	(24)
Adjusted balance, January 1		3,819		4,158	4,095
Interest accrual	202	216		219
Net premiums: earned during period	(436)	(457)		(459)
Balance, end of period at original locked in discount rate	3,585	3,917		3,855
Effect of changes in discount rate	125	74		880	1,140
Balance, December 31	3,710	3,991		4,735
Present value of future benefits & expenses
Balance, January 1	17,471	22,745		23,955
Effect of changes in discount rate	(578)	(125)		(5,942)	(7,395)
Balance, January 1, at original locked in discount rate	17,346	16,803		16,560
Effect of change in cash flow assumptions		36		538	176
Effect of actual variances from expected experience		(46)		(21)	(19)
Adjusted balance, January 1		17,336		17,320	16,717
Interest accrual	962	979		973
Benefit & expense payments	(1,207)	(953)		(887)
Balance, end of period at original locked in discount rate	17,091	17,346		16,803
Effect of changes in discount rate	578	125		5,942	7,395
Balance, December 31	17,669	17,471		22,745
Net LFPB	13,959	13,480	[1]	18,010	$ 19,132
Insurance claims and policyholders benefits, including policyholders' dividends, remeasurement impact	$ (88)	$ (214)		$ (8)

[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.