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Business Combinations - Narrative (Details) - Magellan complete care - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Mar. 31, 2021
Business Acquisition, Contingent Consideration [Line Items]    
Outstanding equity interests 100.00%  
Total Purchase price $ 1,037  
Receivables   $ 6
Payable   25
Amounts due government agencies   33
Goodwill   $ 6