Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 15,126	$ 16,726	$ 46,377	$ 48,327
Contract with Customer, Liability [Abstract]
Contract with Customer, Liability	344		344		$ 604
Change in Contract with Customer, Liability [Abstract]
Contract with Customer, Liability, Revenue Recognized	121	193	742	519
Ag Services and Oilseeds [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	11,527	12,616	35,347	36,382
Ag Services [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	7,352	8,246	22,930	23,653
Crushing [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	2,317	2,465	7,035	7,130
Refined Products and Other [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,858	1,905	5,382	5,599
Carbohydrate Solutions [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	2,064	2,565	6,394	7,409
Starches and sweeteners [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,574	1,526	4,769	4,782
VCP [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	490	1,039	1,625	2,627
Nutrition [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,451	1,457	4,359	4,263
Wild Flavors and Specialty Ingredients [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	719	703	2,161	2,105
Animal Nutrition [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	732	754	2,198	2,158
Other [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	84	88	277	273
Non MTM Products and Services [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	4,625	5,988	14,608	15,767
Non MTM Products and Services [Member] | Transferred at Point in Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	4,538	5,854	14,298	15,390
Non MTM Products and Services [Member] | Transferred over Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	87	134	310	377
Non MTM Products and Services [Member] | Ag Services and Oilseeds [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,438	2,306	4,808	5,097
Non MTM Products and Services [Member] | Ag Services and Oilseeds [Member] | Transferred at Point in Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,351	2,172	4,498	4,720
Non MTM Products and Services [Member] | Ag Services and Oilseeds [Member] | Transferred over Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	87	134	310	377
Non MTM Products and Services [Member] | Ag Services [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	863	1,503	2,814	2,886
Non MTM Products and Services [Member] | Ag Services [Member] | Transferred at Point in Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	776	1,369	2,504	2,509
Non MTM Products and Services [Member] | Ag Services [Member] | Transferred over Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	87	134	310	377
Non MTM Products and Services [Member] | Crushing [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	113	175	493	546
Non MTM Products and Services [Member] | Crushing [Member] | Transferred at Point in Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	113	175	493	546
Non MTM Products and Services [Member] | Refined Products and Other [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	462	628	1,501	1,665
Non MTM Products and Services [Member] | Refined Products and Other [Member] | Transferred at Point in Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	462	628	1,501	1,665
Non MTM Products and Services [Member] | Carbohydrate Solutions [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,652	2,137	5,164	6,134
Non MTM Products and Services [Member] | Carbohydrate Solutions [Member] | Transferred at Point in Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,652	2,137	5,164	6,134
Non MTM Products and Services [Member] | Starches and sweeteners [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,162	1,098	3,539	3,507
Non MTM Products and Services [Member] | Starches and sweeteners [Member] | Transferred at Point in Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,162	1,098	3,539	3,507
Non MTM Products and Services [Member] | VCP [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	490	1,039	1,625	2,627
Non MTM Products and Services [Member] | VCP [Member] | Transferred at Point in Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	490	1,039	1,625	2,627
Non MTM Products and Services [Member] | Nutrition [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,451	1,457	4,359	4,263
Non MTM Products and Services [Member] | Nutrition [Member] | Transferred at Point in Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,451	1,457	4,359	4,263
Non MTM Products and Services [Member] | Wild Flavors and Specialty Ingredients [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	719	703	2,161	2,105
Non MTM Products and Services [Member] | Wild Flavors and Specialty Ingredients [Member] | Transferred at Point in Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	719	703	2,161	2,105
Non MTM Products and Services [Member] | Animal Nutrition [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	732	754	2,198	2,158
Non MTM Products and Services [Member] | Animal Nutrition [Member] | Transferred at Point in Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	732	754	2,198	2,158
Non MTM Products and Services [Member] | Other [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	84	88	277	273
Non MTM Products and Services [Member] | Other [Member] | Transferred at Point in Time [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	84	88	277	273
Mark-to-Market Products [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	10,501	10,738	31,769	32,560
Mark-to-Market Products [Member] | Ag Services and Oilseeds [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	10,089	10,310	30,539	31,285
Mark-to-Market Products [Member] | Ag Services [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	6,489	6,743	20,116	20,767
Mark-to-Market Products [Member] | Crushing [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	2,204	2,290	6,542	6,584
Mark-to-Market Products [Member] | Refined Products and Other [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,396	1,277	3,881	3,934
Mark-to-Market Products [Member] | Carbohydrate Solutions [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	412	428	1,230	1,275
Mark-to-Market Products [Member] | Starches and sweeteners [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 412	$ 428	$ 1,230	$ 1,275