Financing Receivables (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Financing Receivable Recorded Investment [Line Items]
Financing receivable	$ 238		$ 238		$ 264
Argentina [Member]
Financing Receivable Recorded Investment [Line Items]
Financing receivable	216		216		236
UNITED STATES
Financing Receivable Recorded Investment [Line Items]
Financing receivable	6		6		20
Brazil [Member]
Financing Receivable Recorded Investment [Line Items]
Financing receivable	9		9		8
Other Entity [Member]
Financing Receivable Recorded Investment [Line Items]
Financing receivable	7		7		$ 0
Other Expense [Member]
Financing Receivable Recorded Investment [Line Items]
Allowance for other receivables	$ 15	$ 0	$ 15	$ 0