XML 63 R45.htm IDEA: XBRL DOCUMENT v3.20.4
Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Trade receivables $ 7,101.0 $ 6,717.0
Vendor and manufacturer receivables 9,815.0 7,856.0
Premium receivables 2,628.0 2,663.0
Other receivables 2,198.0 2,381.0
Total accounts receivable, net 21,742.0 19,617.0
Accounts Receivable, allowance for credit loss $ 358.0 $ 319.0