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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]) | Sep. 30, 2013 | Dec. 31, 2012
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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 | 27.50% | 13.50%
Transportation cost | 15.90% | 8.40%
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 | 22.40% | 45.70%
Transportation cost | 16.60% | 16.20%
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 | 13.80% | 26.20%
Transportation cost | 0.00% | 9.10%
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 | 16.90% | 17.00%
Transportation cost | 9.90% | 7.70%

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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: | instant

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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: | instant

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