Advances and Other Receivables, Net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounting standards update		us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member
Financing receivable, allowance for credit loss	$ 44	$ 44
Financial instruments collection period		39 months
Advances and other receivables reserve
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit loss	13	$ 27
Financing receivable, allowance for credit loss	27	27
Purchase Discount
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	$ 17	$ 17