Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Jun. 30, 2011 years acquisitions securities days segments VIEs	Jun. 30, 2010	Jun. 30, 2009
Segment and Geographic Information
Number of reportable segments (in segments)									3
Segment Reporting Information
Sales to external customers									$ 80,676	$ 61,682	$ 69,207
Intersegment sales									6,188	4,351	4,829
Net sales	22,870	20,077	20,930	16,799	15,703	15,145	15,913	14,921	80,676	61,682	69,207
Depreciation									827	857	730
Asset abandonments and write-downs									2	9	13
Interest expense									482	422	469
Interest income									136	126	181
Equity in earnings of affiliates									542	561	145
Operating profit									3,015	2,585	2,500
Investments in and advances to affiliates	3,240				2,799				3,240	2,799
Identifiable assets	42,193				31,808				42,193	31,808
Gross additions to property, plant, and equipment									1,512	1,788
Long-lived assets	9,844				8,974				9,844	8,974
Reportable segment totals
Segment Reporting Information
Operating profit									4,021	3,239	2,453
Oilseeds Processing
Segment Reporting Information
Ownership percentage (as a percent)	100.00%								100.00%
Ownership percentage in Golden Peanut before third quarter of fiscal 2011 (as a percent)		50.00%
Sales to external customers									26,662	21,810	23,948
Intersegment sales									2,118	1,318	679
Net sales									28,780	23,128	24,627
Depreciation									168	188	190
Asset abandonments and write-downs										4	4
Interest expense									43	37	89
Interest income									28	34	36
Equity in earnings of affiliates									212	305	283
Operating profit									1,524	1,400	1,280
Investments in and advances to affiliates	1,647				1,563				1,647	1,563
Identifiable assets	13,629				9,618				13,629	9,618
Gross additions to property, plant, and equipment									620	349
Corn Processing
Segment Reporting Information
Sales to external customers									9,908	7,873	7,628
Intersegment sales									194	103	175
Net sales									10,102	7,976	7,803
Depreciation									399	412	319
Interest expense									9	8	17
Interest income										1
Equity in earnings of affiliates									83	78	44
Operating profit									1,062	722	185
Investments in and advances to affiliates	483				361				483	361
Identifiable assets	7,606				6,822				7,606	6,822
Gross additions to property, plant, and equipment									349	915
Agricultural Services
Segment Reporting Information
Ownership percentage (as a percent)	80.00%								80.00%
Sales to external customers									37,927	26,757	32,249
Intersegment sales									3,726	2,784	3,822
Net sales									41,653	29,541	36,071
Depreciation									128	112	96
Interest expense									51	31	80
Interest income									48	26	29
Equity in earnings of affiliates									105	76	76
Operating profit									922	668	994
Investments in and advances to affiliates	297				224				297	224
Identifiable assets	9,779				5,888				9,779	5,888
Gross additions to property, plant, and equipment									339	320
Other
Segment Reporting Information
Sales to external customers									6,179	5,242	5,382
Intersegment sales									150	146	153
Net sales									6,329	5,388	5,535
Depreciation									107	116	101
Asset abandonments and write-downs									2	5	9
Interest expense									50	50	86
Interest income									46	52	79
Equity in earnings of affiliates									135	86	(253)
Operating profit									513	449	(6)
Investments in and advances to affiliates	395				302				395	302
Identifiable assets	10,420				7,700				10,420	7,700
Gross additions to property, plant, and equipment									164	149
Intersegment elimination and Corporate
Segment Reporting Information
Net sales									(6,188)	(4,351)	(4,829)
Depreciation									25	29	24
Interest expense									329	296	197
Interest income									14	13	37
Equity in earnings of affiliates									7	16	(5)
Operating profit									(1,006)	(654)	47
Investments in and advances to affiliates	418				349				418	349
Identifiable assets	759				1,780				759	1,780
Gross additions to property, plant, and equipment									40	55
United States.
Segment Reporting Information
Net sales									42,390	33,362	35,485
Long-lived assets	7,394				6,964				7,394	6,964
Switzerland
Segment Reporting Information
Net sales									8,413	5,770	3,650
Germany
Segment Reporting Information
Net sales									6,217	6,424	7,431
Other Foreign
Segment Reporting Information
Net sales									23,656	16,126	22,641
Foreign
Segment Reporting Information
Long-lived assets	$ 2,450				$ 2,010				$ 2,450	$ 2,010