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Significant Accounting Policies - Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statutory Accounting Practices [Line Items]
Total receivables	$ 1,672	$ 1,406
Government receivables
Statutory Accounting Practices [Line Items]
Total receivables	969	1,056
Pharmacy rebate receivables
Statutory Accounting Practices [Line Items]
Total receivables	178	150
Health insurer fee reimbursement receivables
Statutory Accounting Practices [Line Items]
Total receivables	104	5
Other
Statutory Accounting Practices [Line Items]
Total receivables	255	195
Magellan Complete Care
Statutory Accounting Practices [Line Items]
Total receivables	$ 166	$ 0

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+ References

No definition available.

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- Definition

The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

+ 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))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-06(3))
-URI http://asc.fasb.org/extlink&oid=120401414&loc=d3e604059-122996

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
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