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Segment Information - Reportable Segments and Total Assets (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2024
USD ($)
segment
Dec. 31, 2023
USD ($)
Segment Reporting [Abstract]    
Number of reportable segments | segment 4  
Summary of assets by segment    
Total assets $ 185,969 $ 175,191
Advice & Wealth Management    
Summary of assets by segment    
Total assets 42,434 42,983
Asset Management    
Summary of assets by segment    
Total assets 7,953 7,288
Retirement & Protection Solutions    
Summary of assets by segment    
Total assets 119,017 108,451
Corporate & Other    
Summary of assets by segment    
Total assets $ 16,565 $ 16,469