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Acquisitions - Narrative (Details) - AEL - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
May 02, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Business Combination [Line Items]        
Cash $ 2,525      
Business acquisition, equity interest issued or issuable, number of shares (in shares) 28,803,599      
Contributed revenues       $ 1,300
Contributed net loss       250
Consolidated unaudited pro forma revenue       6,500
Consolidated unaudited pro forma net profit (loss)       $ 500
Business combination, provisional information, initial accounting incomplete, adjustment, market risk benefit liability     $ 45  
Business combination, provisional information, initial accounting incomplete, adjustment, assets     45  
Decrease in intangibles     40  
Deferred tax asset     8  
Increase in goodwill     $ 32  
Acquisition costs   $ 126