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Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Trade receivables $ 6,966 $ 6,896
Vendor and manufacturer receivables 8,358 7,655
Premium receivables 2,098 2,259
Other receivables 752 821
Total accounts receivable, net $ 18,174 $ 17,631