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Quarterly Financial Data (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2010
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
After-tax facility exit and other related costs |  | $ 107,000,000 |  | $ 222,000,000 |  |  |  |  |  |  |  |  |
After-tax facility exit and other related costs (per share) |  | 0.16 |  | 0.33 |  |  |  |  |  |  |  |  |
After-tax gain on interest in Grain Corp | 49,000,000 |  |  |  |  |  |  |  |  |  |  |  |
After-tax gain on interest in Grain Corp (per share) | $ 0.07 |  |  |  |  |  |  |  |  |  |  |  |
After-tax gain related to the sale of exchange membership interests | 24,000,000 |  |  |  |  |  |  |  |  |  |  |  |
After-tax gain related to the sale of exchange membership interests (per share) | $ 0.04 |  |  |  |  |  |  |  |  |  |  |  |
After-tax pension settlement charges | 44,000,000 |  |  |  |  |  |  |  |  |  |  |  |
After-tax pension settlement charges (per share) | $ 0.07 |  |  |  |  |  |  |  |  |  |  |  |
After-tax restructuring and related cost, incurred cost |  |  | 52,000,000 |  |  |  |  |  |  |  |  |  |
After-tax restructuring and related cost, cost incurred (per share) |  |  | 0.08 |  |  |  |  |  |  |  |  |  |
After-tax start up costs for new greenfield plants |  |  |  |  | 11,000,000 | 14,000,000 | 14,000,000 | 20,000,000 |  |  |  |  |
After-tax start up costs for new greenfield plants (per share) |  |  |  |  | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.03 |  |  |  |  |
Charges from early extinguishment of debt |  |  |  |  | 15,000,000 |  |  |  | 5,000,000 | 12,000,000 | 12,000,000 | 15,000,000 | 75,000,000
After-tax charges from debt buyback or exchange |  |  |  |  | 9,000,000 |  |  |  |  |  |  |  |
After-tax charges from debt buyback or exchange (per share) |  |  |  |  | 0.01 |  |  |  |  |  |  |  |
Pre-tax gain on sale of bank securities of equity investee |  |  |  |  | 78,000,000 |  |  |  |  |  |  |  |
After-tax gain on sale of bank securities of equity investee |  |  |  |  | 49,000,000 |  |  |  |  |  |  |  |
After-tax gain on sale of bank securities of equity investee (per share) |  |  |  |  | $ 0.07 |  |  |  |  |  |  |  |
Pre-tax gain related to the acquisition of the remaining interest in Golden Peanut |  |  |  |  |  |  | 71,000,000 |  |  |  |  | 71,000,000 |
After-tax gain related to the acquisition of the remaining interest in Golden Peanut |  |  |  |  |  |  | 44,000,000 |  |  |  |  |  |
After-tax gain related to the acquisition of the remaining interest in Golden Peanut (per share) |  |  |  |  |  |  | $ 0.07 |  |  |  |  |  |
After-tax (losses) gains on interest rate swap after tax |  |  |  |  |  | 4,000,000 | 34,000,000 | (19,000,000) |  |  |  |  |
After-tax (losses) gains on interest rate swap (per share) |  |  |  |  |  | $ 0.01 | $ 0.05 | $ (0.03) |  |  |  |  |
After-tax increase to earnings due to adjustments to machinery and equipment assets |  |  |  |  | $ 28,000,000 | $ 31,000,000 | $ 24,000,000 |  |  |  |  |  |
After-tax increase to earnings due to adjustments to machinery and equipment assets (per share) |  |  |  |  | $ 0.04 | $ 0.05 | $ 0.04 |  |  |  |  |  |

X
- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasureing to fair value the equity interest in the acquiree it held before the business combination, net of tax. + References No definition available. + Details
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X
- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasureing to fair value the equity interest in the acquiree it held before the business combination, net of tax. (per share) + References No definition available. + Details
Name: | adm_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainPerShareNetOfTax
Namespace Prefix: | adm_
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Period Type: | duration

X
- Definition Represents the charge against earnings during the perod for fees on early exchange of debt and (gain)/loss on exchange of debt. + References No definition available. + Details
Name: | adm_ChargesFromDebtBuybackOrExchange
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the charge against earnings during the perod for fees on early exchange of debt and (gain)/loss on exchange of debt, after tax. + References No definition available. + Details
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Namespace Prefix: | adm_
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Balance Type: | debit
Period Type: | duration

X
- Definition Represents the charge against earnings during the perod for fees on early exchange of debt and (gain)/loss on exchange of debt, net of tax (per share). + References No definition available. + Details
Name: | adm_ChargesFromDebtBuybackOrExchangeNetOfTaxPerShare
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits, after tax. + References No definition available. + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits after tax, per share. + References No definition available. + Details
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X
- Definition Equity Earnings Related To Gain On The Sale Of Bank Securites After Tax + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Equity Earnings Related To Gain On The Sale Of Bank Securites Before Tax + References No definition available. + Details
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Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the per share impact of the gain on sale of bank shares of equity investee, net of applicable taxes. + References No definition available. + Details
Name: | adm_EquityMethodInvestmentRealizedGainLossOnDisposalPerShareNetOfTax
Namespace Prefix: | adm_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount charged against earnings in the period for incurred costs associated with the exit of a business or facility including an asset impairment charge on long lived assets, after tax. + References No definition available. + Details
Name: | adm_FacilityExitAndOtherRelatedCostsAfterTax
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount charged against earnings in the period for incurred costs associated with the exit of a business facility including an asset impairment charge on long lived assets, after tax per share. + References No definition available. + Details
Name: | adm_FacilityExitAndOtherRelatedCostsAfterTaxPerShare
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the after-tax increase (decrease) to the earnings due to adjustments to certain machinery and equipment asset lives of the entity. + References No definition available. + Details
Name: | adm_GainLossOnAdjustmentsToPropertyPlantAndEquipmentRecordedInEarningsNetAfterTax
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the increase (decrease) to the earnings, net of tax, per each share of common stock due to adjustments to certain machinery and equipment asset lives of the entity. + References No definition available. + Details
Name: | adm_GainLossOnAdjustmentsToPropertyPlantAndEquipmentRecordedInEarningsNetAfterTaxPerShare
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X
- Definition The difference between the book value and the sales price of swaps and other derivative instruments also including items related to holding the investment. Items may include dividends and foreign exchange impact, after tax + References No definition available. + Details
Name: | adm_GainLossOnSaleOfDerivativesAndOtherItemsAfterTax
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The difference between the book value and the sales price of swaps and other derivative instruments alsoincluding items related to holding the investment. Items may include dividends and foreign exchange impact after tax, per share. + References No definition available. + Details
Name: | adm_GainLossOnSaleOfDerivativesAndOtherItemsAfterTaxPerShare
Namespace Prefix: | adm_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The difference between the book value and the sale price of other nonspecific investments. This element is used when other, more specific, elements are not appropriate. This element refers to the gain (loss) included in earnings after tax. + References No definition available. + Details
Name: | adm_GainLossOnSaleOfOtherInvestmentsAfterTax
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The difference between the book value and the sale price of other nonspecific investments. This element is used when other, more specific, elements are not appropriate. This element refers to the gain (loss) included in earnings after tax, per share. + References No definition available. + Details
Name: | adm_GainLossOnSaleOfOtherInvestmentsAfterTaxPerShare
Namespace Prefix: | adm_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the gain (loss) on interest rate cash flow hedges, net of tax. + References No definition available. + Details
Name: | adm_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNetAfterTax
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the gain (loss) on interest rate cash flow hedges, net of tax. (per share) + References No definition available. + Details
Name: | adm_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNetAfterTaxPerShare
Namespace Prefix: | adm_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents after-tax start up costs for new facilities charged to earnings during the period. + References No definition available. + Details
Name: | adm_NewFacilityStartUpCosts
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents after-tax start up costs for new facilities charged to earnings during the period per common share. + References No definition available. + Details
Name: | adm_NewFacilityStartUpCostsPerShare
Namespace Prefix: | adm_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount charged against the accrued restructuring reserves, or earnings if not previously accrued, durring the period for the specified type of resturcturing cost, after tax per share. + References No definition available. + Details
Name: | adm_RestructuringAndRelatedCostIncurrecCostAfterTaxPerShare
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount charged against the accrued restructuring reserves, or earnings if not previously accrued, durring the period for the specified type of resturcturing cost, after tax. + References No definition available. + Details
Name: | adm_RestructuringAndRelatedCostIncurredCostAfterTax
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 + Details
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