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Acquisitions and Divestitures - Divestitures (Details)
£ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Jan. 12, 2024
USD ($)
Dec. 02, 2022
USD ($)
Apr. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Aug. 31, 2023
USD ($)
Aug. 31, 2023
GBP (£)
Jan. 20, 2023
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Impairment charge       $ 13 $ 529 $ 2,318      
(Gain) loss on divestitures, net       (120) (152) (772)      
Goodwill impairment         392        
Net tax benefit       (963) (899) (760)      
Foreign currency swap agreement                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Derivative notional amount             $ 931 £ 740  
Fair value of swap agreement         13        
Spanish and Central European Businesses | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Impairment charge           163      
Impairment charge, net of tax           140      
(Gain) loss on divestitures, net         13        
Gain (loss) on divestitures, net of tax         (10)        
Magellan Rx | 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) loss on divestitures, net   $ (269)     (22)        
Gain (loss) on divestitures, net of tax   (99)     (10)        
Proceeds from divestitures   $ 1,337              
Magellan Specialty Health | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Gain (loss) on divestitures, net of tax         (68)        
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) loss on divestitures, net       (83) (79)        
Proceeds from divestitures     $ 245            
Consideration on divestiture                 $ 646
Centurion | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Impairment charge           259      
Impairment charge, net of tax           181      
(Gain) loss on divestitures, net         (15)        
Gain (loss) on divestitures, net of tax         (10)        
HealthSmart | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Impairment charge           36      
Impairment charge, net of tax           $ 27      
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) loss on divestitures, net         (93)        
Gain (loss) on divestitures, net of tax         (67)        
Circle 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) loss on divestitures, net       (20)          
Net tax benefit       40          
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]                  
Proceeds from divestitures $ 931                
Assets held for sale         3,897        
Liabilities held for sale         3,094        
Goodwill impairment         292        
Goodwill impairment, net of tax         258        
Operose 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]                  
Impairment charge         140        
Impairment charge, net of tax         $ 128        
Collaborative Health Systems | 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) loss on divestitures, net       (17)          
Gain (loss) on divestitures, net of tax       $ (13)