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Segment Information - Reconciliation of Net Investment Income from Segments to Consolidated (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Net investment income $ 1,473 $ 1,347
Operating Segments | Annuities    
Segment Reporting Information [Line Items]    
Net investment income 559 494
Operating Segments | Life Insurance    
Segment Reporting Information [Line Items]    
Net investment income 510 481
Operating Segments | Group Protection    
Segment Reporting Information [Line Items]    
Net investment income 91 87
Operating Segments | Retirement Plan Services    
Segment Reporting Information [Line Items]    
Net investment income 257 249
Other Operations    
Segment Reporting Information [Line Items]    
Net investment income $ 56 $ 36