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Fair Value Measurements (Narrative) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] | Jun. 30, 2011 Fair Value, Measurements, Recurring [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Liabilities [Member] | Dec. 31, 2012 Weighted Average [Member] Fair Value, Measurements, Recurring [Member] Inventories Component [Member] Assets [Member] | Jun. 30, 2012 Weighted Average [Member] Fair Value, Measurements, Recurring [Member] Inventories Component [Member] Assets [Member] | Dec. 31, 2012 Weighted Average [Member] Fair Value, Measurements, Recurring [Member] Inventories Component [Member] Liabilities [Member] | Jun. 30, 2012 Weighted Average [Member] Fair Value, Measurements, Recurring [Member] Inventories Component [Member] Liabilities [Member]
Fair Value Measurements [Line Items] |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on derivative assets and liabilities |  |  | $ 109 | $ 130 | $ (165) |  |  |  |
Threshold of relative value of unobservable inputs to the total fair value for Level 3 |  | 10.00% |  |  |  |  |  |  |
Unobservable Price Component, as a percent | 100.00% |  |  |  |  |  |  |  |
Basis |  |  |  |  |  | 13.50% | 8.80% | 26.20% | 2.30%

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 This element represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in earnings. Such unrealized (holding) gains or losses relate to those assets and liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
Name: | adm_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- 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