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Fair Value Measurements (Unobservable Inputs In Level 3 Valuations Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (Weighted Average [Member], Significant Unobservable Inputs (Level 3) [Member], Fair Value, Measurements, Recurring [Member]) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2012 | Jun. 30, 2012
Assets [Member] | Inventories Component [Member] |  |
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Basis | 14.80% | 8.80%
Transportation cost | 10.70% | 8.50%
Assets [Member] | Commodity Derivative Contracts [Member] |  |
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Basis | 18.40% | 12.60%
Transportation cost | 8.60% | 12.60%
Liabilities [Member] | Inventories Component [Member] |  |
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Basis | 4.00% | 2.30%
Transportation cost | 7.40% | 7.90%
Liabilities [Member] | Commodity Derivative Contracts [Member] |  |
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Basis | 19.00% | 11.80%
Transportation cost | 14.90% | 14.00%

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- Definition Adjustment to current market value, based on location, that a market participant is willing to pay, used as an input to measure fair value. + References No definition available. + Details
Name: | adm_Basis
Namespace Prefix: | adm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Transportation costs, used as an input to measure fair value. + References No definition available. + Details
Name: | adm_Freight
Namespace Prefix: | adm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | adm_UnobservableInputsInLevel3ValuationsOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisLineItems
Namespace Prefix: | adm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration