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Acquisitions and Divestitures - Divestiture (Details)
£ in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 13, 2023
USD ($)
Jan. 20, 2023
USD ($)
Apr. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Aug. 31, 2023
USD ($)
Aug. 31, 2023
GBP (£)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Gain on divestiture             $ 172 $ 503      
Impairment charge       $ (440)   $ (289) (478) $ (1,739)      
Goodwill impairment             348   $ 370    
Currency Swap                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Notional amount                   $ 931 £ 740
Fair value, swap agreement       27     27        
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                  
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                    
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)    
Circle Health | Disposal Group, Held-for-sale, Not Discontinued Operations                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Assets held for sale       3,744     3,744        
Liabilities held for sale       2,947     $ 2,947        
Goodwill impairment       251              
Goodwill, impairment, net of tax       $ 269