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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]) | 9 Months Ended
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Mar. 31, 2012
Assets [Member] | Commodity Derivative Contracts [Member] |
Basis | 15.10%
Transportation cost | 9.70%
Assets [Member] | Inventories Component [Member] |
Basis | 10.50%
Transportation cost | 6.20%
Liabilities [Member] | Commodity Derivative Contracts [Member] |
Basis | 24.10%
Transportation cost | 12.10%
Liabilities [Member] | Inventories Component [Member] |
Basis | 4.80%
Transportation cost | 9.10%

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 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