Segment Information (Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Information
Revenues	$ (18,893)	$ (14,970)
Earnings Before Income Taxes	824	375
Ag Services and Oilseeds [Member]
Segment Information
Revenues	(15,007)	(11,079)
Earnings Before Income Taxes	777	422
Ag Services [Member]
Segment Information
Revenues	(10,146)	(6,926)
Crushing [Member]
Segment Information
Revenues	(2,742)	(2,313)
Refined Products and Other [Member]
Segment Information
Revenues	(2,119)	(1,840)
Carbohydrate Solutions [Member]
Segment Information
Revenues	(2,223)	(2,316)
Earnings Before Income Taxes	259	68
Starches and sweeteners [Member]
Segment Information
Revenues	(1,745)	(1,650)
VCP [Member]
Segment Information
Revenues	(478)	(666)
Nutrition [Member]
Segment Information
Revenues	(1,563)	(1,471)
Earnings Before Income Taxes	154	142
Human Nutrition [Member]
Segment Information
Revenues	(754)	(719)
Animal Nutrition [Member]
Segment Information
Revenues	(809)	(752)
Other [Member]
Segment Information
Revenues	(100)	(104)
Earnings Before Income Taxes	9	11
Operating Segments [Member]
Segment Information
Earnings Before Income Taxes	1,105	599
Operating Segments [Member] | Ag Services and Oilseeds [Member]
Segment Information
Revenues	(15,939)	(12,350)
Operating Segments [Member] | Carbohydrate Solutions [Member]
Segment Information
Revenues	(2,634)	(2,554)
Operating Segments [Member] | Nutrition [Member]
Segment Information
Revenues	(1,624)	(1,516)
Operating Segments [Member] | Other [Member]
Segment Information
Revenues	(100)	(104)
Intersegment Elimination [Member]
Segment Information
Revenues	1,404	1,554
Intersegment Elimination [Member] | Ag Services and Oilseeds [Member]
Segment Information
Revenues	932	1,271
Intersegment Elimination [Member] | Carbohydrate Solutions [Member]
Segment Information
Revenues	411	238
Intersegment Elimination [Member] | Nutrition [Member]
Segment Information
Revenues	61	45
Corporate, Non-Segment [Member]
Segment Information
Earnings Before Income Taxes	(281)	(224)
Asset impairment, restructuring, and settlement [Member] | Segment Reconciling Items [Member]
Segment Information
Earnings Before Income Taxes	$ (94)	$ (44)