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Business Combinations (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Jan. 01, 2022
Oct. 25, 2021
Sep. 30, 2022
AgeWell        
Business Acquisition, Contingent Consideration [Line Items]        
Total purchase price $ 134      
Cigna Corporation's Texas Medicaid and Medicare-Medicaid Plan        
Business Acquisition, Contingent Consideration [Line Items]        
Total purchase price   $ 60    
Goodwill   24    
Cigna Corporation's Texas Medicaid and Medicare-Medicaid Plan | Member list        
Business Acquisition, Contingent Consideration [Line Items]        
Acquired membership with a preliminary fair value   $ 36    
Affinity Health Plan, Inc        
Business Acquisition, Contingent Consideration [Line Items]        
Total purchase price     $ 176  
Goodwill       $ 7
Medical claims and benefits payable       8
Increase to receivables, net of amounts due government agencies       $ 1