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BUSINESS SEGMENT INFORMATION - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total assets $ 314,409 $ 295,727 $ 298,841
Operating Segments | Retirement      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total assets 193,110 173,796  
Operating Segments | Asset Management      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total assets 10,166 10,137  
Operating Segments | Wealth Management      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total assets 289 168  
Corporate and Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total assets $ 110,844 $ 111,626