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Advances and Other Receivables - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Purchase discount utilized | $ 228
Purchase discount remaining | 93
Allowance for credit loss | $ 38
Financial instruments, collection period | 39 months
Reserves for Advances and Other Receivables |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Provision for credit loss | $ 21
Allowance for credit loss | 21
Purchase Discount |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Allowance for credit loss | $ 17

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