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Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Accounting Policies [Abstract]    
Trade receivables $ 9,084 $ 7,932
Vendor and manufacturer receivables 12,242 10,573
Premium receivables 3,399 2,537
Other receivables 2,508 3,389
Total accounts receivable, net 27,233 24,431
Allowance for credit losses $ 340 $ 339