Accounts Receivable and Notes Receivable and Credit Quality of Receivables - Allowance for Notes Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses as of September 30	$ (42)	$ (40)
Allowance for credit losses as of December 31		(42)
Accounts Receivable, Net, Current	616	755
Allowance for Loan and Lease Losses, Period Increase (Decrease)	56
Latin America [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Accounts Receivable, before Allowance for Credit Loss	107
Accounts Receivable, Allowance for Credit Loss	(53)
Accounts Receivable, Net, Current	54
Accounts Receivable, before Allowance for Credit Loss	107
Notes Receivable
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses as of September 30	(36)
Provision	(56)	(9)
Charge-offs and recoveries	12	13
Allowance for credit losses as of December 31	$ (86)	$ (36)
Financing receivable, percentage greater than 90 days past due	14.00%	11.00%
Financial Asset Current Or Not Yet Due [Member] | Latin America [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Accounts Receivable, before Allowance for Credit Loss	$ 49
Accounts Receivable, Allowance for Credit Loss	(14)
Accounts Receivable, Net, Current	35
Accounts Receivable, before Allowance for Credit Loss	49
Balances over 90 days past due | Latin America [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Accounts Receivable, before Allowance for Credit Loss	58
Accounts Receivable, Allowance for Credit Loss	(39)
Accounts Receivable, Net, Current	19
Accounts Receivable, before Allowance for Credit Loss	$ 58