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Basis of Presentation - Changes in Allowances for Credit Losses (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Allowance for Trade Receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at January 1, 2020	$ (35)
Current period provision for expected credit losses	(5)
Currency	1
Balance at March 31, 2020	(39)
Allowance for Other Current Receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at January 1, 2020	(44)
Current period provision for expected credit losses	1
Currency	3
Balance at March 31, 2020	(40)
Allowance for Long-Term Receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at January 1, 2020	(14)
Current period provision for expected credit losses	(2)
Currency	3
Balance at March 31, 2020	$ (13)