Segment Information (Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Information
Revenues	$ (16,281)	$ (16,297)	$ (31,251)	$ (31,601)
Earnings Before Income Taxes	552	274	927	589
Ag Services and Oilseeds [Member]
Segment Information
Revenues	(12,741)	(12,228)	(23,820)	(23,766)
Earnings Before Income Taxes	413	362	835	779
Ag Services [Member]
Segment Information
Revenues	(8,652)	(8,030)	(15,578)	(15,407)
Crushing [Member]
Segment Information
Revenues	(2,405)	(2,316)	(4,718)	(4,665)
Refined Products and Other [Member]
Segment Information
Revenues	(1,684)	(1,882)	(3,524)	(3,694)
Carbohydrate Solutions [Member]
Segment Information
Revenues	(2,014)	(2,441)	(4,330)	(4,844)
Earnings Before Income Taxes	195	192	263	288
Starches and sweeteners [Member]
Segment Information
Revenues	(1,545)	(1,684)	(3,195)	(3,306)
VCP [Member]
Segment Information
Revenues	(469)	(757)	(1,135)	(1,538)
Nutrition [Member]
Segment Information
Revenues	(1,437)	(1,524)	(2,908)	(2,806)
Earnings Before Income Taxes	158	117	300	198
Human Nutrition [Member]
Segment Information
Revenues	(723)	(728)	(1,442)	(1,402)
Animal Nutrition [Member]
Segment Information
Revenues	(714)	(796)	(1,466)	(1,404)
Other [Member]
Segment Information
Revenues	(89)	(104)	(193)	(185)
Earnings Before Income Taxes	38	11	49	25
Corporate, Non-Segment [Member]
Segment Information
Earnings Before Income Taxes	(261)	(371)	(485)	(667)
Aggregate Segment [Member]
Segment Information
Earnings Before Income Taxes	813	645	1,412	1,256
Operating Segments [Member] | Ag Services and Oilseeds [Member]
Segment Information
Revenues	(14,431)	(13,728)	(26,781)	(26,601)
Operating Segments [Member] | Carbohydrate Solutions [Member]
Segment Information
Revenues	(2,213)	(2,878)	(4,767)	(5,454)
Operating Segments [Member] | Nutrition [Member]
Segment Information
Revenues	(1,474)	(1,541)	(2,990)	(2,841)
Operating Segments [Member] | Other [Member]
Segment Information
Revenues	(89)	(104)	(193)	(185)
Intersegment Elimination [Member]
Segment Information
Revenues	1,926	1,954	3,480	3,480
Intersegment Elimination [Member] | Ag Services and Oilseeds [Member]
Segment Information
Revenues	1,690	1,500	2,961	2,835
Intersegment Elimination [Member] | Carbohydrate Solutions [Member]
Segment Information
Revenues	199	437	437	610
Intersegment Elimination [Member] | Nutrition [Member]
Segment Information
Revenues	37	17	82	35
Other (Income) Expense - Net [Member] | Segment Reconciling Items [Member]
Segment Information
Earnings Before Income Taxes	23	0	23	12
Asset impairment, restructuring, and settlement [Member] | Segment Reconciling Items [Member]
Segment Information
Earnings Before Income Taxes	$ (14)	$ (37)	$ (58)	$ (46)