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Fair Value Measurements (Narrative) (Details) (Fair Value, Measurements, Recurring [Member], Significant Unobservable Inputs (Level 3) [Member]) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Fair Value Measurements [Line Items] |  |
Threshold of relative value of unobservable inputs to the total fair value for Level 3, as a percent | 10.00% |
Unobservable Price Component, as a percent | 100.00% |
Weighted Average [Member] | Inventories Component [Member] | Assets [Member] |  |
Fair Value Measurements [Line Items] |  |
Basis | 26.90% | 13.50%
Weighted Average [Member] | Inventories Component [Member] | Liabilities [Member] |  |
Fair Value Measurements [Line Items] |  |
Basis | 4.90% | 26.20%

X
- 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

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

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- Definition Threshold percentage of fair value contributed by unobservable inputs for assets or liabilities to be classified as Level 3. + References No definition available. + Details
Name: | adm_Level3UnobservableInputsMinimum
Namespace Prefix: | adm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent of unobservable inputs to the total price for certain contracts and inventories valued at fair value + References No definition available. + Details
Name: | adm_UnobservablePriceComponentAsPercent
Namespace Prefix: | adm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration