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Business Combinations (Details) - USD ($)
$ in Millions
 6 Months Ended
Jan. 01, 2022
Oct. 25, 2021
Jun. 30, 2022
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 $ 36,000    
Affinity Health Plan, Inc      
Business Acquisition, Contingent Consideration [Line Items]      
Total purchase price   $ 176  
Goodwill     $ 11
Medical claims and benefits payable     7
Increase to receivables, net of amounts due government agencies     $ 17