Segment and Geographic Information (Segment Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								6 Months Ended		12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2012
Segment Information
Revenues	$ 20,894	$ 18,117	$ 21,494	$ 20,696	$ 24,143	$ 21,393	$ 22,541	$ 21,727	$ 46,729	$ 45,208	$ 81,201	$ 89,804	$ 89,038
Depreciation									396	391	850	827	793
Asset abandonments and write-downs									0	337	35	84	367
Interest income									59	62	92	102	112
Equity in earnings of affiliates									255	251	372	411	472
Operating profit									997	781	3,130	2,024	1,765
Investments in and advances to affiliates	3,892				3,538						3,892	3,538
Identifiable assets	44,027				43,752						44,027	43,752
Gross additions to property, plant, and equipment											1,357	947
Reportable segment totals [Member]
Segment Information
Operating profit									1,306	1,063	3,915	2,708	2,525
Oilseeds Processing
Segment Information
Revenues									18,052	17,337	31,546	34,883	34,715
Depreciation									113	108	244	237	228
Asset abandonments and write-downs									0	0	3	4	1
Interest income									18	16	30	36	35
Equity in earnings of affiliates									96	129	236	261	226
Operating profit									747	429	1,605	1,473	1,302
Investments in and advances to affiliates	2,596				2,304						2,596	2,304
Identifiable assets	12,979				15,408						12,979	15,408
Gross additions to property, plant, and equipment											335	302
Crushing and origination [Member]
Segment Information
Revenues									10,784	8,927	18,542	20,522	18,794
Refining, packaging, biodiesel, and other [Member]
Segment Information
Revenues									5,256	6,218	9,111	10,375	11,628
Cocoa and other [Member]
Segment Information
Revenues									1,746	1,952	3,439	3,281	3,715
Asia [Member]
Segment Information
Revenues									266	240	454	705	578
Corn Processing [Member]
Segment Information
Revenues									6,167	6,451	11,686	13,139	12,114
Depreciation									165	178	323	325	345
Asset abandonments and write-downs									0	337	15	62	360
Interest income									1	0	10	3	1
Equity in earnings of affiliates									49	53	113	98	107
Operating profit									71	54	1,188	814	261
Investments in and advances to affiliates	426				438						426	438
Identifiable assets	6,196				6,558						6,196	6,558
Gross additions to property, plant, and equipment											334	317
Sweeteners and starches [Member]
Segment Information
Revenues									2,405	2,316	3,749	4,717	4,793
Bioproducts [Member]
Segment Information
Revenues									3,762	4,135	7,937	8,422	7,321
Agricultural Services [Member]
Segment Information
Revenues									22,441	21,364	37,327	41,480	42,082
Depreciation									99	90	214	220	188
Asset abandonments and write-downs									0	0	17	3	2
Interest income									18	10	31	47	22
Equity in earnings of affiliates									49	55	41	64	110
Operating profit									395	563	1,089	380	947
Investments in and advances to affiliates	460				309						460	309
Identifiable assets	10,716				12,358						10,716	12,358
Gross additions to property, plant, and equipment											186	239
Merchandising and handling [Member]
Segment Information
Revenues									20,159	19,061	33,061	36,968	37,631
Transportation [Member]
Segment Information
Revenues									128	149	265	228	269
Milling and other [Member]
Segment Information
Revenues									2,154	2,154	4,001	4,284	4,182
Other Segments [Member]
Segment Information
Revenues									69	56	642	302	127
Depreciation									2	2	15	5	4
Interest income									11	14	14	12	21
Equity in earnings of affiliates									0	0	10	1	0
Operating profit									93	17	33	41	15
Investments in and advances to affiliates	33				24						33	24
Identifiable assets	10,833				6,408						10,833	6,408
Gross additions to property, plant, and equipment											434	1
Other Processing [Member]
Segment Information
Revenues									0	0	312	0	0
Financial [Member]
Segment Information
Revenues									69	56	330	302	127
Corporate [Member]
Segment Information
Depreciation									17	13	54	40	28
Asset abandonments and write-downs									0	0	0	15	4
Interest income									11	22	7	4	33
Equity in earnings of affiliates									61	14	(28)	(13)	29
Operating profit									(309)	(282)	(785)	(684)	(760)
Investments in and advances to affiliates	377				463						377	463
Identifiable assets	3,303				3,020						3,303	3,020
Gross additions to property, plant, and equipment											68	88
Gross Revenues [Member] | Oilseeds Processing
Segment Information
Revenues									19,465	18,073	34,196	38,490	36,990
Gross Revenues [Member] | Corn Processing [Member]
Segment Information
Revenues									6,223	6,564	11,814	13,299	12,287
Gross Revenues [Member] | Agricultural Services [Member]
Segment Information
Revenues									25,487	24,115	41,150	46,950	47,691
Gross Revenues [Member] | Other Segments [Member]
Segment Information
Revenues									151	136	885	515	288
Intersegment Eliminations [Member]
Segment Information
Revenues									(4,597)	(3,680)	(6,844)	(9,450)	(8,218)
Intersegment Eliminations [Member] | Oilseeds Processing
Segment Information
Revenues									(1,413)	(736)	(2,650)	(3,607)	(2,275)
Intersegment Eliminations [Member] | Corn Processing [Member]
Segment Information
Revenues									(56)	(113)	(128)	(160)	(173)
Intersegment Eliminations [Member] | Agricultural Services [Member]
Segment Information
Revenues									(3,046)	(2,751)	(3,823)	(5,470)	(5,609)
Intersegment Eliminations [Member] | Other Segments [Member]
Segment Information
Revenues									$ (82)	$ (80)	$ (243)	$ (213)	$ (161)