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Acquisitions and Divestitures -Divestiture (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 13, 2023
Jan. 20, 2023
Apr. 30, 2023
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Gain on divestiture           $ 172 $ 0  
Impairment charge       $ 18 $ 1,450 $ 38 $ 1,450  
Centurion | Disposal Group, Disposed of by Sale, Not Discontinued Operations                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Gain on divestiture       15        
Magellan Specialty Health | Disposal Group, Disposed of by Sale, Not Discontinued Operations                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Gain on divestiture   $ 79            
Consideration received on divestiture   646            
Proceeds from sale of business     $ 245          
Contingent consideration on disposal (up to)   $ 150            
Spanish and Central European Businesses | Disposal Group, Disposed of by Sale, Not Discontinued Operations                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Gain on divestiture       $ 13        
Impairment charge               $ (163)
Impairment charge, net of tax               $ (140)
Apixio | Disposal Group, Disposed of by Sale, Not Discontinued Operations                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Gain on disposal $ 91              
Gain on disposal, net of tax $ 63