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Significant Accounting Policies - Receivables (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | $ 3,350 | $ 3,104
Government receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | 2,270 | 2,354
Pharmacy rebate receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | 369 | 330
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | $ 711 | $ 420

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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://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481372/852-10-55-10 + Details
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