Asset Impairment, Exit, and Restructuring Costs (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Asset Impairment Charges And Exit Costs [Line Items]
Restructuring Charges	$ 26	$ 161	$ 29
Other Asset Impairment Charges	28	131	121
Goodwill and Intangible Asset Impairment	26	11	9
Corporate [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Restructuring Charges	9	159	24
Other Asset Impairment Charges	7		49
Ag Services and Oilseeds [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Other Asset Impairment Charges	8	130	61
Goodwill and Intangible Asset Impairment	26
Carbohydrate Solutions [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Other Asset Impairment Charges		$ 1
Nutrition [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Other Asset Impairment Charges	13		$ 11
All Reportable Segments [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Restructuring Charges	$ 17