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Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Trade receivables $ 6,413 $ 6,497
Vendor and manufacturer receivables 9,029 7,315
Premium receivables 2,340 2,259
Other receivables 2,007 1,560
Total accounts receivable, net $ 19,789 $ 17,631