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Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Accounting Policies [Abstract]    
Trade receivables $ 9,793 $ 11,908
Vendor and manufacturer receivables 13,528 15,711
Premium receivables 4,430 3,714
Other receivables 4,634 3,894
Total accounts receivable, net 32,385 35,227
Allowance for credit losses $ 355 $ 343