Asset Impairment, Exit, and Restructuring Costs (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Asset Impairment Charges And Exit Costs [Line Items]
Impairment, settlement, and restructuring per share, after tax	$ 0.16	$ 0.08	$ 0.18	$ 0.35
Restructuring Charges					$ 161	$ 29	$ 72
Other Asset Impairment Charges					131	121	101
Corporate [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Restructuring Charges					159	24	54
Other Asset Impairment Charges						49
Ag Services and Oilseeds [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Other Asset Impairment Charges					130	61
Carbohydrate Solutions [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Other Asset Impairment Charges					$ 1		63
Nutrition [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Other Asset Impairment Charges						$ 11	$ 20