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Significant Accounting Policies - Receivables (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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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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- 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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