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Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Accounting Policies [Abstract] |  |
Trade receivables | $ 9,884 | $ 11,908
Vendor and manufacturer receivables | 15,621 | 15,711
Premium receivables | 3,942 | 3,714
Other receivables | 6,732 | 3,894
Total accounts receivable, net | 36,179 | 35,227
Allowance for credit losses | $ 346 | $ 343

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