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Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Accounting Policies [Abstract]    
Trade receivables $ 10,586 $ 11,908
Vendor and manufacturer receivables 12,681 15,711
Premium receivables 5,420 3,714
Other receivables 3,530 3,894
Total accounts receivable, net 32,217 35,227
Allowance for credit losses $ 402 $ 343