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Fair Value Measurement (Narrative) (Details) | 9 Months Ended
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Mar. 31, 2012
Unobservable Price Component, as a percent | 100.00%
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodity Derivative Contracts [Member] | Weighted Average [Member] | Assets [Member] |
Basis | 15.10%
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodity Derivative Contracts [Member] | Weighted Average [Member] | Liabilities [Member] |
Basis | 24.10%

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
- 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