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Accounts and Notes Receivable and Credit Quality of Receivables - Components of Accounts and Notes Receivable, Net (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019
Current:
Receivables		$ 686			$ 791
Current receivables, net		(74)			(36)
Long-term:		612			755
Receivables
Allowance for credit losses		38		$ 53	53
Long-term receivables, net		650			808
Financing Receivable, Allowance for Credit Loss, Noncurrent		(8)			0
Financing Receivable, before Allowance for Credit Loss		46			$ 53
Cumulative Effect of New Accounting Principle in Period of Adoption			$ (6)
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ 12	$ 40