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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Jun. 30, 2012 | Sep. 30, 2012 Brazilian Federal Revenue Service [Member] | Jun. 30, 2007 Brazilian Federal Revenue Service [Member] | Jun. 30, 2006 Brazilian Federal Revenue Service [Member] | Jun. 30, 2004 Brazilian Federal Revenue Service [Member] | Jun. 30, 2005 Argentine Tax Authorities [Member]
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Effective income tax rate | 38.00% | 30.00% | 30.00% |  |  |  |  |
Discrete tax expense | $ 8 |  |  |  |  |  |  |
Effective income tax rate, excluding discrete items | 30.00% |  |  |  |  |  |  |
Number of separate tax assessments |  |  |  | 3 |  |  |  |
Tax assessment received consisting of tax, penalty, and interest |  |  |  |  | 83 | 19 | 472 |
Estimated further assessments that could be received |  |  |  | 101 |  |  |  |
Tax assessment received |  |  |  |  |  |  |  | $ 10

X
- Definition This element represents the amount of additional income tax expense that could be received, if BFRS challenges commodity hedging deductions in all tax years for which an audit has not yet been initiated that are still open for assessment. + References No definition available. + Details
Name: | adm_AnticipatedAdditionalIncomeTaxExaminationPenaltiesAndInterestExpense
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A ratio calculated by dividig the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations, excluding discrete items. + References No definition available. + Details
Name: | adm_EffectiveIncomeTaxRateContinuingOperationsExcludingDiscreteItems
Namespace Prefix: | adm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The sum of estimated tax, penalties and interest associated with tax deductibility challenge in a foreign jurisdiction relating to prior years. + References No definition available. + Details
Name: | adm_EstimatedIncomeTaxExaminationPenaltiesAndInterestExpense
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The sum of estimated tax associated with tax deductibility callenge in a foreign jusrisdiction relating to prior years. + References No definition available. + Details
Name: | adm_EstimatedTaxExaminationExpense
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The tax effect of gains and losses from events or transactions related to discrete items. + References No definition available. + Details
Name: | adm_IncomeTaxEffectOfDiscreteItemsGainLoss
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | adm_IncomeTaxesLineItems
Namespace Prefix: | adm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of separate tax assessments received. + References No definition available. + Details
Name: | adm_IncomeTaxExaminationNumberOfTaxAssessments
Namespace Prefix: | adm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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Namespace Prefix: | us-gaap_
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