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Advances and Other Receivables - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, allowance for credit loss | $ 42 | $ 31 | $ 42 | $ 31
Financial instruments collection period |  |  | 39 months |
Advances and other receivables reserve |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit loss | 3 | 8 | $ 4 | 14
Financing receivable, allowance for credit loss | 25 | 14 | 25 | 14
Purchase Discount |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, allowance for credit loss | $ 17 | $ 17 | $ 17 | $ 17

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