Schedule IV - Reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Life insurance in force, Gross	$ 583,218	$ 596,806	$ 610,227
Life insurance in force, Ceded	328,594	346,714	368,598
Life insurance in force, Assumed	4,671	4,963	5,644
Life insurance in force, Net	$ 259,295	$ 255,055	$ 247,273
Percentage of Assumed to Net, Life insurance in force	1.80%	1.90%	2.30%
Direct premiums	$ 4,084	$ 3,599	$ 3,257
Ceded Premiums	929	908	859
Assumed premiums	21	26	25
Net premiums	$ 3,176	$ 2,717	$ 2,423
Percentage Assumed to Net, Premiums	0.70%	1.00%	1.00%
Life Insurance Product Line
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct premiums	$ 1,209	$ 1,188	$ 1,198
Ceded Premiums	530	571	589
Assumed premiums	21	25	24
Net premiums	$ 700	$ 642	$ 633
Percentage Assumed to Net, Premiums	3.00%	3.90%	3.80%
Accident and Health Insurance Product Line
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct premiums	$ 2,847	$ 2,359	$ 2,018
Ceded Premiums	388	323	255
Assumed premiums	0	0	0
Net premiums	$ 2,459	$ 2,036	$ 1,763
Percentage Assumed to Net, Premiums	0.00%	0.00%	0.00%
Annuity Contracts
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct premiums	$ 28	$ 52	$ 41
Ceded Premiums	11	14	15
Assumed premiums	0	1	1
Net premiums	$ 17	$ 39	$ 27
Percentage Assumed to Net, Premiums	0.00%	2.60%	3.70%