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Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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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

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