Segment Information (Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Information
Revenues	$ (14,970)	$ (15,304)
Earnings Before Income Taxes	375	315
Ag Services and Oilseeds [Member]
Segment Information
Revenues	(11,079)	(11,538)
Earnings Before Income Taxes	422	417
Ag Services [Member]
Segment Information
Revenues	(6,926)	(7,377)
Crushing [Member]
Segment Information
Revenues	(2,313)	(2,349)
Refined Products and Other [Member]
Segment Information
Revenues	(1,840)	(1,812)
Carbohydrate Solutions [Member]
Segment Information
Revenues	(2,316)	(2,403)
Earnings Before Income Taxes	68	96
Starches and sweeteners [Member]
Segment Information
Revenues	(1,650)	(1,598)
VCP [Member]
Segment Information
Revenues	(666)	(805)
Nutrition [Member]
Segment Information
Revenues	(1,471)	(1,282)
Earnings Before Income Taxes	142	81
Human Nutrition [Member]
Segment Information
Revenues	(719)	(674)
Animal Nutrition [Member]
Segment Information
Revenues	(752)	(608)
Other [Member]
Segment Information
Revenues	(104)	(81)
Earnings Before Income Taxes	11	14
Corporate, Non-Segment [Member]
Segment Information
Earnings Before Income Taxes	(224)	(296)
Aggregate Segment [Member]
Segment Information
Earnings Before Income Taxes	599	611
Operating Segments [Member] | Ag Services and Oilseeds [Member]
Segment Information
Revenues	(12,350)	(12,873)
Operating Segments [Member] | Carbohydrate Solutions [Member]
Segment Information
Revenues	(2,554)	(2,576)
Operating Segments [Member] | Nutrition [Member]
Segment Information
Revenues	(1,516)	(1,300)
Operating Segments [Member] | Other [Member]
Segment Information
Revenues	(104)	(81)
Intersegment Elimination [Member]
Segment Information
Revenues	1,554	1,526
Intersegment Elimination [Member] | Ag Services and Oilseeds [Member]
Segment Information
Revenues	1,271	1,335
Intersegment Elimination [Member] | Carbohydrate Solutions [Member]
Segment Information
Revenues	238	173
Intersegment Elimination [Member] | Nutrition [Member]
Segment Information
Revenues	45	18
Other (Income) Expense - Net [Member] | Segment Reconciling Items [Member]
Segment Information
Earnings Before Income Taxes	0	12
Asset impairment, restructuring, and settlement [Member] | Segment Reconciling Items [Member]
Segment Information
Earnings Before Income Taxes	$ (44)	$ (9)