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Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Trade receivables $ 7,698 $ 6,717
Vendor and manufacturer receivables 8,585 7,856
Premium receivables 3,916 2,663
Other receivables 2,838 2,381
Total accounts receivable, net $ 23,037 $ 19,617