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Significant Accounting Policies - Receivables (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 1,776	$ 1,672
Government receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	1,332	969
Pharmacy rebate receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	200	178
Health insurer fee reimbursement receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	54	104
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	190	255
Magellan Complete Care acquisition opening balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 0	$ 166

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No definition available.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(5))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.6-06(3))
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