Segment and Geographic Information (Segment Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended										6 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Segment Information
Sales to external customers											$ 46,729	$ 45,208	$ 89,038	$ 80,676	$ 61,682
Intersegment sales											4,597	3,680	8,218	6,869	4,024
Net sales	24,921	21,808	22,675	21,155	23,306	21,902	22,870	20,077	20,930	16,799	46,729	45,208	89,038	80,676	61,682
Depreciation											396	391	793	827	857
Asset abandonments and write-downs											146	337	367	2	9
Interest income											59	62	112	136	126
Equity in earnings of affiliates											255	251	472	542	561
Operating profit											997	781	1,765	3,015	2,585
Investments in and advances to affiliates	3,170		3,388				3,240				3,170		3,388	3,240
Identifiable assets	45,136		41,771				42,352				45,136		41,771	42,352
Gross additions to property, plant, and equipment											641		1,719	1,512
Reportable segment totals [Member]
Segment Information
Operating profit											1,306	1,063	2,525	4,131	3,337
Oilseeds Processing
Segment Information
Sales to external customers											18,052	17,337	34,715	29,908	24,412
Intersegment sales											1,413	736	2,275	2,103	1,334
Net sales											19,465	18,073	36,990	32,011	25,746
Depreciation											113	108	228	215	243
Asset abandonments and write-downs													1	2	9
Interest income											18	16	35	28	34
Equity in earnings of affiliates											96	129	226	213	306
Operating profit											747	429	1,302	1,690	1,551
Investments in and advances to affiliates	1,889		1,811				1,648				1,889		1,811	1,648
Identifiable assets	15,856		17,041				16,576				15,856		17,041	16,576
Gross additions to property, plant, and equipment											259		588	673
Corn Processing [Member]
Segment Information
Sales to external customers											6,167	6,451	12,114	9,908	7,874
Intersegment sales											56	113	173	194	103
Net sales											6,223	6,564	12,287	10,102	7,977
Depreciation											165	178	345	399	412
Asset abandonments and write-downs												337	360
Interest income											1		1		1
Equity in earnings of affiliates											49	53	107	83	78
Operating profit											71	54	261	1,079	738
Investments in and advances to affiliates	505		470				483				505		470	483
Identifiable assets	6,649		6,491				7,606				6,649		6,491	7,606
Gross additions to property, plant, and equipment											169		349	349
Agricultural Services [Member]
Segment Information
Sales to external customers											22,441	21,364	42,082	40,750	29,301
Intersegment sales											3,046	2,751	5,609	4,417	2,436
Net sales											25,487	24,115	47,691	45,167	31,737
Depreciation											99	90	188	183	167
Asset abandonments and write-downs											146		2
Interest income											18	10	22	23	18
Equity in earnings of affiliates											49	55	110	230	152
Operating profit											395	563	947	1,323	1,002
Investments in and advances to affiliates	297		671				669				297		671	669
Identifiable assets	14,201		11,444				11,242				14,201		11,444	11,242
Gross additions to property, plant, and equipment											182		740	442
Other [Member]
Segment Information
Sales to external customers											69	56	127	110	95
Intersegment sales											82	80	161	155	151
Net sales											151	136	288	265	246
Depreciation											2	2	4	5	6
Interest income											11	14	21	46	51
Equity in earnings of affiliates														9	9
Operating profit											93	17	15	39	46
Investments in and advances to affiliates	18		46				22				18		46	22
Identifiable assets	5,912		5,028				6,010				5,912		5,028	6,010
Gross additions to property, plant, and equipment													1	8
Intersegment Elimination [Member]
Segment Information
Net sales											(4,597)	(3,680)	(8,218)	(6,869)	(4,024)
Corporate [Member]
Segment Information
Depreciation											17	13	28	25	29
Asset abandonments and write-downs													4
Interest income											11	22	33	39	22
Equity in earnings of affiliates											61	14	29	7	16
Operating profit											(309)	(282)	(760)	(1,116)	(752)
Investments in and advances to affiliates	461		390				418				461		390	418
Identifiable assets	2,518		1,767				918				2,518		1,767	918
Gross additions to property, plant, and equipment											$ 31		$ 41	$ 40