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Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Trade receivables | $ 10,424 | $ 8,983
Vendor and manufacturer receivables | 16,646 | 12,395
Premium receivables | 3,254 | 2,676
Other receivables | 2,603 | 3,449
Total accounts receivable, net | 32,927 | 27,503
Allowance for credit losses | $ 357 | 333
Disposal Group, Held-for-sale, Not Discontinued Operations |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total accounts receivable, net |  | $ 227

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