Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Premiums	$ 922	$ 1,104	$ 1,298
Net investment income	1,362	1,382	1,541
Net investment gains (losses)	7	(51)	(36)
Net derivative gains (losses)	0	33	18
Total revenues	2,291	2,468	2,821
Expenses
Policyholder benefits and claims	1,706	1,890	2,150
Policyholder dividends	366	458	626
Other expenses	86	90	96
Total expenses	2,158	2,438	2,872
Revenues, net of expenses before provision for income tax expense (benefit)	133	30	(51)
Provision for income tax expense (benefit)	28	6	(11)
Revenues, net of expenses and provision for income tax expense (benefit)	$ 105	$ 24	$ (40)