Advances and Other Receivables - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	$ 39	$ 23
Financial instruments collection period	39 months
Advances and other receivables reserve
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit loss	$ 1	6
Financing receivable, allowance for credit loss	22	6
Purchase Discount
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	$ 17	$ 17