Impairment and Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended							12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring and asset impairment charges
Restructuring charges	$ 10	$ 5	$ 5	$ 11	$ 2	$ 2	$ 10		$ 38	$ 19	$ 28
Other restructuring charges including refinement of prior year restructuring activities									2
Argentina employee-related severance
Restructuring and asset impairment charges
Restructuring charges									17
Finance transformation initiative in North America
Restructuring and asset impairment charges
Restructuring charges									6
Stevia Leaf Extraction Process in Brazil
Restructuring and asset impairment charges
Restructuring charges	13								13
Abandonment of certain assets	6
Inventory write downs	6
Restructuring accrual
Restructuring charge for employee-related severance costs	1
Stevia Leaf Extraction Process in Brazil | Forecast
Restructuring and asset impairment charges
Other additional restructuring charges								$ 1
Penford
Restructuring and asset impairment charges
Restructuring charges											12
Employee Severance related costs
Restructuring accrual
Balance in severance accrual at December 31, 2016				$ 7				11	7
Payments made to terminated employees									(15)
Balance in severance accrual at September 30, 2017	$ 11				$ 7				11	7
Employee Severance related costs | Forecast
Restructuring and asset impairment charges
Severance accrual expected to be paid within next twelve months								10
Employee Severance related costs | Argentina employee-related severance
Restructuring accrual
Restructuring charge for employee-related severance costs									15
Employee Severance related costs | Finance transformation initiative in North America
Restructuring and asset impairment charges
Restructuring charges									3
Restructuring accrual
Restructuring charge for employee-related severance costs									3
Employee Severance related costs | Other employee-related severance
Restructuring accrual
Restructuring charge for employee-related severance costs									3
Employee Severance related costs | Prior year restructuring activities
Restructuring accrual
Restructuring charge for employee-related severance costs									(2)
Employee Severance related costs | Optimization Initiative Of North And South America
Restructuring and asset impairment charges
Restructuring charges										6
Restructuring accrual
Restructuring charge for employee-related severance costs										6
Non employee severance costs | Finance transformation initiative in North America
Restructuring and asset impairment charges
Restructuring charges									$ 3
Employee Severance And Other Costs | Finance transformation initiative in North America | Minimum | Forecast
Restructuring and asset impairment charges
Restructuring charges								1
Employee Severance And Other Costs | Finance transformation initiative in North America | Maximum | Forecast
Restructuring and asset impairment charges
Restructuring charges								$ 2
Employee Severance And Other Costs | IT transformation
Restructuring and asset impairment charges
Restructuring charges										11
Facility Closing | Port Colborne Ontario Canada Plant
Restructuring and asset impairment charges
Restructuring charges										2
Facility Closing | Plant Closing In Trombudo Central And Conchal
Restructuring and asset impairment charges
Restructuring charges											$ 12
Facility Closing | Port Colborne Ontario Canada Plant
Restructuring and asset impairment charges
Restructuring charges										$ 2