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Acquisitions and Divestitures (Details)
£ in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 12, 2024
USD ($)
Dec. 02, 2022
USD ($)
Dec. 31, 2025
USD ($)
Apr. 30, 2023
USD ($)
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
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]                      
Gain (loss) on divestiture           $ 2 $ 120 $ 152      
Goodwill impairment         $ 6,723            
Net tax benefit           51 (963) (899)      
Foreign currency swap agreement                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Derivative notional amount                 $ 931 £ 740  
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]                      
Proceeds from divestitures   $ 1,337                  
Gain (loss) on divestiture   269       2   (22)      
Gain (loss) on divestitures, net of tax   $ 99       1   (10)      
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]                      
Proceeds from divestitures       $ 245              
Gain (loss) on divestiture             83 79      
Gain (loss) on divestitures, net of tax               68      
Consideration on divestiture                     $ 646
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]                      
Proceeds from divestitures $ 931                    
Gain (loss) on divestiture             20        
Net tax benefit             40        
Circle 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]                      
Goodwill impairment               292      
Goodwill impairment, net of tax               $ 258      
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 divestiture             17        
Gain (loss) on divestitures, net of tax             $ 13        
Magellan Health | Disposal Group, Held-for-Sale, Not Discontinued Operations                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Goodwill impairment     $ 513                
Goodwill impairment, net of tax     389                
Assets held for sale     303     303          
Liabilities held for sale     $ 303     $ 303