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Significant Accounting Policies - Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
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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