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Business Combinations - Narrative (Details) - Magellan complete care - USD ($) $ in Millions |  | 9 Months Ended
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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

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- Definition Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Amounts due Government Agencies + References No definition available. + Details
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