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Business Combinations - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended
Jan. 01, 2024
Sep. 01, 2023
Aug. 31, 2024
Sep. 30, 2024
Bright Health Medicare        
Business Acquisition, Contingent Consideration [Line Items]        
Cash paid for acquisition $ 441      
Acquisition costs       $ 3
Contingent consideration liabilities 100      
Consideration transferred 86      
Third-party escrow 100      
Acquired receivable, fair value 14      
Fair value of contingent consideration       $ 100
Purchase price $ 427      
My Choice Wisconsin        
Business Acquisition, Contingent Consideration [Line Items]        
Purchase price   $ 74    
Additional purchase consideration     $ 49