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Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Trade receivables $ 6,848 $ 6,717
Vendor and manufacturer receivables 9,791 7,856
Premium receivables 3,080 2,663
Other receivables 2,801 2,381
Total accounts receivable, net $ 22,520 $ 19,617