Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 748	$ 748
Additions from business combinations(2)	56	0
Goodwill, Ending Balance	804	748
Accumulated impairment of goodwill	0
Goodwill, gross	0	0
Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	102	102
Additions from business combinations(2)	0	0
Goodwill, Ending Balance	102	102
Operating Segments \| Investment Management
Goodwill [Roll Forward]
Goodwill, Beginning Balance	286	286
Additions from business combinations(2)	0	0
Goodwill, Ending Balance	286	286
Operating Segments \| Retirement Segment
Goodwill [Roll Forward]
Goodwill, Beginning Balance	17	17
Additions from business combinations(2)	56	0
Goodwill, Ending Balance	73	17
Operating Segments \| Employee Benefits Segment
Goodwill [Roll Forward]
Goodwill, Beginning Balance	343	343
Additions from business combinations(2)	0	0
Goodwill, Ending Balance	343	$ 343
Corporate \| Wealth Solutions
Goodwill [Roll Forward]
Goodwill, Ending Balance	72
Corporate \| Health Solutions
Goodwill [Roll Forward]
Goodwill, Ending Balance	20
Corporate \| Investment Management
Goodwill [Roll Forward]
Goodwill, Ending Balance	$ 10

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