Asset Impairment, Exit, and Restructuring Costs (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Asset Impairment Charges And Exit Costs [Line Items]
Relocation and restructuring costs	$ 21,000,000	$ 71,000,000	$ 64,000,000
Number of securities impaired | item	2
Restructuring, Settlement and Impairment Provisions	$ 55,000,000	200,000,000	105,000,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	6,000,000	0	6,000,000
Goodwill, Impairment Loss		13,000,000
Goodwill and Intangible Asset Impairment	11,000,000	21,000,000	0
Other Asset Impairment Charges	$ 17,000,000	108,000,000	35,000,000
Corporate [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)		8,000,000
Other Asset Impairment Charges		1,000,000
Agricultural Services [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Other Asset Impairment Charges			17,000,000
Corn Processing [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Other Asset Impairment Charges		66,000,000	15,000,000
Oilseeds Processing
Asset Impairment Charges And Exit Costs [Line Items]
Other Asset Impairment Charges		40,000,000	3,000,000
Wild and Specialty Ingredients [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Other Asset Impairment Charges		1,000,000
Pension plan settlement [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Relocation and restructuring costs		29,000,000
Facility closing [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Relocation and restructuring costs		22,000,000
Employee Relocation [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Relocation and restructuring costs			16,000,000
Other Restructuring [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Relocation and restructuring costs		$ 20,000,000	$ 48,000,000