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Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Trade receivables $ 7,265 $ 6,717
Vendor and manufacturer receivables 10,528 7,856
Premium receivables 2,852 2,663
Other receivables 3,171 2,381
Total accounts receivable, net $ 23,816 $ 19,617