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Segments - Total Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]    
Total assets $ 178,859 $ 163,889
Operating Segments and Corporate Nonsegment    
Segment Reporting Information [Line Items]    
Total assets 174,410 159,361
Operating Segments | Retirement Segment    
Segment Reporting Information [Line Items]    
Total assets 144,423 129,058
Operating Segments | Investment Management    
Segment Reporting Information [Line Items]    
Total assets 1,905 1,873
Operating Segments | Employee Benefits Segment    
Segment Reporting Information [Line Items]    
Total assets 3,330 3,490
Corporate    
Segment Reporting Information [Line Items]    
Total assets 24,749 24,940
Consolidation of investment entities    
Segment Reporting Information [Line Items]    
Total assets $ 4,449 $ 4,528