Goodwill and Specifically Identifiable Intangible Assets - Changes in Carrying Amount of Goodwill, by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Gross Goodwill as of Beginning- of-Year			$ 1,744	$ 3,932
Accumulated Impairment as of Beginning- of-Year			(600)	(2,154)
Net Goodwill as of Beginning- of-Year		$ 1,144	1,778
Impairment		0	(634)
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
Life Insurance
Goodwill [Roll Forward]
Gross Goodwill as of Beginning- of-Year				2,188
Accumulated Impairment as of Beginning- of-Year				(1,554)
Net Goodwill as of Beginning- of-Year		0	634
Impairment	$ (634)		(634)
Net Goodwill as of End- of-Year			0
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