Asset Impairment, Exit, and Restructuring Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Asset Impairment Charges And Exit Costs [Line Items]
Asset impairment, exit, and restructuring costs	$ 107	$ 11	$ 140	$ 36
Asset Impairment Charges	63
Restructuring Charges	$ 44		47
Restructuring Costs and Asset Impairment Charges		5	30	14
Corn Processing [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Asset Impairment Charges			$ 63	5
Corporate Segment [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Asset Impairment Charges		$ 6		$ 17