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Significant Accounting Policies - Receivables (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | $ 1,912 | $ 1,672
Government receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | 1,331 | 969
Pharmacy rebate receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | 264 | 178
Health insurer fee reimbursement receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | 25 | 104
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | 292 | 255
Magellan Complete Care acquisition opening balance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | $ 0 | $ 166

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