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Goodwill and Specifically Identifiable Intangible Assets - Schedule of Intangible Assets by Reportable Segment (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ 265 $ 228
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross Carrying Amount 712 712
Accumulated Amortization 265 228
Mutual fund contract rights    
Indefinite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 5 5
Sales force    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 100 100
Accumulated Amortization 75 71
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization 75 71
VOCRA    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 576 576
Accumulated Amortization 175 145
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization 175 145
VODA    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 31 31
Accumulated Amortization 15 12
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization $ 15 $ 12