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Business Combinations - Narrative (Details) - Magellan complete care - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2020
Sep. 30, 2021
Business Acquisition, Contingent Consideration [Line Items]    
Outstanding equity interests 100.00%  
Total Purchase price $ 1,037  
Receivables   $ 7
Payable   27
Amounts due government agencies   18
Goodwill   $ 9