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Significant Accounting Policies - Receivables (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 2,240	$ 2,177
Government receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	1,628	1,566
Pharmacy rebate receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	272	276
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 340	$ 335

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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 https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
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-URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

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