Segment Information (Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Information
Revenues	$ (15,126)	$ (16,726)	$ (46,377)	$ (48,327)
Earnings Before Income Taxes	200	503	1,127	1,092
Ag Services and Oilseeds [Member]
Segment Information
Revenues	(11,527)	(12,616)	(35,347)	(36,382)
Earnings Before Income Taxes	436	417	1,271	1,196
Ag Services [Member]
Segment Information
Revenues	(7,352)	(8,246)	(22,930)	(23,653)
Crushing [Member]
Segment Information
Revenues	(2,317)	(2,465)	(7,035)	(7,130)
Refined Products and Other [Member]
Segment Information
Revenues	(1,858)	(1,905)	(5,382)	(5,599)
Carbohydrate Solutions [Member]
Segment Information
Revenues	(2,064)	(2,565)	(6,394)	(7,409)
Earnings Before Income Taxes	246	182	509	470
Starches and sweeteners [Member]
Segment Information
Revenues	(1,574)	(1,526)	(4,769)	(4,782)
VCP [Member]
Segment Information
Revenues	(490)	(1,039)	(1,625)	(2,627)
Nutrition [Member]
Segment Information
Revenues	(1,451)	(1,457)	(4,359)	(4,263)
Earnings Before Income Taxes	147	118	447	316
Human Nutrition [Member]
Segment Information
Revenues	(719)	(703)	(2,161)	(2,105)
Animal Nutrition [Member]
Segment Information
Revenues	(732)	(754)	(2,198)	(2,158)
Other [Member]
Segment Information
Revenues	(84)	(88)	(277)	(273)
Earnings Before Income Taxes	20	47	69	72
Corporate, Non-Segment [Member]
Segment Information
Earnings Before Income Taxes	(704)	(255)	(1,189)	(922)
Aggregate Segment [Member]
Segment Information
Earnings Before Income Taxes	904	758	2,316	2,014
Operating Segments [Member] | Ag Services and Oilseeds [Member]
Segment Information
Revenues	(13,415)	(14,440)	(40,196)	(41,041)
Operating Segments [Member] | Carbohydrate Solutions [Member]
Segment Information
Revenues	(2,335)	(3,018)	(7,102)	(8,472)
Operating Segments [Member] | Nutrition [Member]
Segment Information
Revenues	(1,481)	(1,481)	(4,471)	(4,322)
Operating Segments [Member] | Other [Member]
Segment Information
Revenues	(84)	(88)	(277)	(273)
Intersegment Elimination [Member]
Segment Information
Revenues	2,189	2,301	5,669	5,781
Intersegment Elimination [Member] | Ag Services and Oilseeds [Member]
Segment Information
Revenues	1,888	1,824	4,849	4,659
Intersegment Elimination [Member] | Carbohydrate Solutions [Member]
Segment Information
Revenues	271	453	708	1,063
Intersegment Elimination [Member] | Nutrition [Member]
Segment Information
Revenues	30	24	112	59
Other (Income) Expense - Net [Member] | Segment Reconciling Items [Member]
Segment Information
Earnings Before Income Taxes	57	0	80	12
Asset impairment, restructuring, and settlement [Member] | Segment Reconciling Items [Member]
Segment Information
Earnings Before Income Taxes	$ (2)	$ (6)	$ (60)	$ (52)