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Significant Accounting Policies - Receivables (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | $ 3,259 | $ 3,104
Government receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | 2,210 | 2,354
Pharmacy rebate receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | 335 | 330
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | $ 714 | $ 420

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