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Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Accounting Policies [Abstract]    
Trade receivables $ 11,221 $ 9,881
Vendor and manufacturer receivables 17,779 13,891
Premium receivables 4,878 4,731
Other receivables 9,979 7,966
Total accounts receivable, net $ 43,857 $ 36,469