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Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Accounting Policies [Abstract]    
Trade receivables $ 8,728 $ 7,932
Vendor and manufacturer receivables 11,685 10,573
Premium receivables 3,508 2,537
Other receivables 2,530 3,389
Total accounts receivable, net 26,451 24,431
Allowance for credit losses $ 324 $ 339