Goodwill and Specifically Identifiable Intangible Assets - Changes in Carrying Amount of Goodwill, by Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Gross Goodwill as of Beginning- of-Year		$ 1,744	$ 1,744
Accumulated Impairment as of Beginning- of-Year		(600)	(600)
Net Goodwill as of Beginning- of-Year	$ 1,144	1,144
Impairment	0	0
Net Goodwill as of End- of-Year	1,144	1,144
Annuities
Goodwill [Roll Forward]
Gross Goodwill as of Beginning- of-Year		1,040	1,040
Accumulated Impairment as of Beginning- of-Year		(600)	(600)
Net Goodwill as of Beginning- of-Year	440	440
Impairment	0	0
Net Goodwill as of End- of-Year	440	440
Group Protection
Goodwill [Roll Forward]
Gross Goodwill as of Beginning- of-Year		684	684
Accumulated Impairment as of Beginning- of-Year		0	0
Net Goodwill as of Beginning- of-Year	684	684
Impairment	0	0
Net Goodwill as of End- of-Year	684	684
Retirement Plan Services
Goodwill [Roll Forward]
Gross Goodwill as of Beginning- of-Year		20	20
Accumulated Impairment as of Beginning- of-Year		0	$ 0
Net Goodwill as of Beginning- of-Year	20	20
Impairment	0	0
Net Goodwill as of End- of-Year	$ 20	$ 20