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Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Trade receivables $ 8,398 $ 7,101
Vendor and manufacturer receivables 11,727 9,815
Premium receivables 2,391 2,628
Other receivables 2,767 2,198
Total accounts receivable, net 25,283 21,742
Allowance for credit losses $ 364 $ 358