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Goodwill and Intangible Assets - Schedule of Changes in Goodwill by Operating Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Roll Forward]    
Balance beginning of period $ 19,771 $ 18,652
Acquisition and purchase accounting adjustments 1,077 1,168
Divestitures (1,533) (24)
Reallocation 0 0
Impairments (370)  
Translation impact (133) (25)
Balance end of period 18,812 19,771
Managed Care     
Goodwill [Roll Forward]    
Balance beginning of period 18,338 16,974
Acquisition and purchase accounting adjustments 172 1,139
Divestitures 0 0
Reallocation 4 250
Impairments (66)  
Translation impact (133) (25)
Balance end of period 18,315 18,338
Specialty Services    
Goodwill [Roll Forward]    
Balance beginning of period 1,433 1,678
Acquisition and purchase accounting adjustments 905 29
Divestitures (1,533) (24)
Reallocation (4) (250)
Impairments (304)  
Translation impact 0 0
Balance end of period $ 497 $ 1,433