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Acquisitions and Divestitures - Narrative (Details) - Magellan Health - USD ($)
$ in Millions
12 Months Ended
Jan. 04, 2022
Dec. 31, 2022
Business Acquisition [Line Items]    
Consideration transferred $ 2,491  
Cash payments to acquire business 2,431  
Fair value adjustment to stock based compensation associated with pre-combination service 60  
Settlement of pre-existing payables and receivables prior to acquisition $ (70)  
Acquisition related costs   $ 106