Revenues Revenues (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 16,329	$ 16,726	$ 16,297	$ 15,304	$ 15,947	$ 15,800	$ 17,068	$ 15,526	$ 64,656	$ 64,341	$ 60,828
Contract with Customer, Liability [Abstract]
Contract with Customer, Liability	$ 604				$ 501				604	501
Contract with Customer, Liability, Revenue Recognized									575	647
Ag Services and Oilseeds [Member]
Disaggregation of Revenue [Line Items]
Revenues									48,741	49,891	46,512
Ag Services [Member]
Disaggregation of Revenue [Line Items]
Revenues									31,705	31,766
Crushing [Member]
Disaggregation of Revenue [Line Items]
Revenues									9,479	10,319
Refined Products and Other [Member]
Disaggregation of Revenue [Line Items]
Revenues									7,557	7,806
Carbohydrate Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues									9,886	10,279	10,406
Starches and sweeteners [Member]
Disaggregation of Revenue [Line Items]
Revenues									6,692	6,696
Bioproducts [Member]
Disaggregation of Revenue [Line Items]
Revenues									3,194	3,583
Nutrition [Member]
Disaggregation of Revenue [Line Items]
Revenues									5,677	3,790	3,523
Wild and Specialty Ingredients [Member]
Disaggregation of Revenue [Line Items]
Revenues									2,745	2,571
Animal Nutrition [Member]
Disaggregation of Revenue [Line Items]
Revenues									2,932	1,219
Other Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues									352	381	$ 387
Non MTM Products and Services [Member]
Disaggregation of Revenue [Line Items]
Revenues									22,389	17,774
Non MTM Products and Services [Member] | Ag Services and Oilseeds [Member]
Disaggregation of Revenue [Line Items]
Revenues									8,174	5,119
Non MTM Products and Services [Member] | Ag Services [Member]
Disaggregation of Revenue [Line Items]
Revenues									5,208	2,663
Non MTM Products and Services [Member] | Crushing [Member]
Disaggregation of Revenue [Line Items]
Revenues									736	664
Non MTM Products and Services [Member] | Refined Products and Other [Member]
Disaggregation of Revenue [Line Items]
Revenues									2,230	1,792
Non MTM Products and Services [Member] | Carbohydrate Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues									8,186	8,484
Non MTM Products and Services [Member] | Starches and sweeteners [Member]
Disaggregation of Revenue [Line Items]
Revenues									4,992	4,901
Non MTM Products and Services [Member] | Bioproducts [Member]
Disaggregation of Revenue [Line Items]
Revenues									3,194	3,583
Non MTM Products and Services [Member] | Nutrition [Member]
Disaggregation of Revenue [Line Items]
Revenues									5,677	3,790
Non MTM Products and Services [Member] | Wild and Specialty Ingredients [Member]
Disaggregation of Revenue [Line Items]
Revenues									2,745	2,571
Non MTM Products and Services [Member] | Animal Nutrition [Member]
Disaggregation of Revenue [Line Items]
Revenues									2,932	1,219
Non MTM Products and Services [Member] | Other Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues									352	381
Non MTM Products and Services [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues									21,874	17,293
Non MTM Products and Services [Member] | Transferred at Point in Time [Member] | Ag Services and Oilseeds [Member]
Disaggregation of Revenue [Line Items]
Revenues									7,659	4,638
Non MTM Products and Services [Member] | Transferred at Point in Time [Member] | Ag Services [Member]
Disaggregation of Revenue [Line Items]
Revenues									4,693	2,182
Non MTM Products and Services [Member] | Transferred at Point in Time [Member] | Crushing [Member]
Disaggregation of Revenue [Line Items]
Revenues									736	664
Non MTM Products and Services [Member] | Transferred at Point in Time [Member] | Refined Products and Other [Member]
Disaggregation of Revenue [Line Items]
Revenues									2,230	1,792
Non MTM Products and Services [Member] | Transferred at Point in Time [Member] | Carbohydrate Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues									8,186	8,484
Non MTM Products and Services [Member] | Transferred at Point in Time [Member] | Starches and sweeteners [Member]
Disaggregation of Revenue [Line Items]
Revenues									4,992	4,901
Non MTM Products and Services [Member] | Transferred at Point in Time [Member] | Bioproducts [Member]
Disaggregation of Revenue [Line Items]
Revenues									3,194	3,583
Non MTM Products and Services [Member] | Transferred at Point in Time [Member] | Nutrition [Member]
Disaggregation of Revenue [Line Items]
Revenues									5,677	3,790
Non MTM Products and Services [Member] | Transferred at Point in Time [Member] | Wild and Specialty Ingredients [Member]
Disaggregation of Revenue [Line Items]
Revenues									2,745	2,571
Non MTM Products and Services [Member] | Transferred at Point in Time [Member] | Animal Nutrition [Member]
Disaggregation of Revenue [Line Items]
Revenues									2,932	1,219
Non MTM Products and Services [Member] | Transferred at Point in Time [Member] | Other Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues									352	381
Non MTM Products and Services [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues									515	481
Non MTM Products and Services [Member] | Transferred over Time [Member] | Ag Services and Oilseeds [Member]
Disaggregation of Revenue [Line Items]
Revenues									515	481
Non MTM Products and Services [Member] | Transferred over Time [Member] | Ag Services [Member]
Disaggregation of Revenue [Line Items]
Revenues									515	481
Mark-to-Market Products [Member]
Disaggregation of Revenue [Line Items]
Revenues									42,267	46,567
Mark-to-Market Products [Member] | Ag Services and Oilseeds [Member]
Disaggregation of Revenue [Line Items]
Revenues									40,567	44,772
Mark-to-Market Products [Member] | Ag Services [Member]
Disaggregation of Revenue [Line Items]
Revenues									26,497	29,103
Mark-to-Market Products [Member] | Crushing [Member]
Disaggregation of Revenue [Line Items]
Revenues									8,743	9,655
Mark-to-Market Products [Member] | Refined Products and Other [Member]
Disaggregation of Revenue [Line Items]
Revenues									5,327	6,014
Mark-to-Market Products [Member] | Carbohydrate Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues									1,700	1,795
Mark-to-Market Products [Member] | Starches and sweeteners [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 1,700	$ 1,795