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Derivative Instruments & Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 31, 2010
Gains on interest rate swaps | $ (55) |  | $ (24) |
Not Designated As Hedging Instrument [Member] |  |  |  |
After-tax gains deferred in AOCI on discontinuation of hedge accounting treatment on interest rate swaps |  |  |  | 21
Amortization period for gains on de-designated hedges in AOCI (in years) |  | 30 |  |
Gains on interest rate swaps | 55 |  | 24 |
Designated As Hedging Instrument [Member] |  |  |  |
After-tax gains (losses) in AOCI from commodity cash flow hedge transactions |  | 7 |  |
Number of months cash flow hedge gains (losses) will be recognized in earnings (in months) |  | 12 |  |
After-tax losses in AOCI related to foreign exchange contracts designated as cash flow hedging instruments |  | 2 |  |
Cash flow hedge losses that will be recognized in earnings |  | 2 |  |
Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps that will be recognized in earnings |  | 22 |  |
Number of years in which after-tax gains (losses) in AOCI related to treasury-lock agreements and interest rate swaps will be recognized in earnings, low end of range (in years) |  | 10 |  |
Number of years in which after-tax gains (losses) in AOCI related to treasury-lock agreements and interest rate swaps will be recognized in earnings, high end of range (in years) |  | 30 |  |
After-tax gains deferred in AOCI on discontinuation of hedge accounting treatment on interest rate swaps, net of amortization |  | 20 |  |
Corn | Designated As Hedging Instrument [Member] |  |  |  |
Corn processed per month (in bushels) |  | 77,000,000 |  |
Historical time period of hedge percentages (in months) |  | 12 |  |
Percentage of anticipated commodity purchases or production hedged during historical hedging period, low end of range (as a percent) |  | 1.00% |  |
Percentage of anticipated commodity purchases or production hedged during historical hedging period, high end of range (as a percent) |  | 100.00% |  |
Percentage of anticipated commodity purchases or production hedged over future hedging period, low end of range (as a percent) |  | 13.00% |  |
Percentage of anticipated commodity purchases or production hedged over future hedging period, high end of range (as a percent) |  | 21.00% |  |
Number of months for which hedges for future monthly commodity purchases, sales or production have been made (in months) |  | 12 |  |
Natural Gas | Designated As Hedging Instrument [Member] |  |  |  |
Natural gas used by production facilities per month (in MMbtus) |  | 3,750,000 |  |
Historical time period of hedge percentages (in months) |  | 12 |  |
Percentage of anticipated commodity purchases or production hedged during historical hedging period, low end of range (as a percent) |  | 21.00% |  |
Percentage of anticipated commodity purchases or production hedged during historical hedging period, high end of range (as a percent) |  | 50.00% |  |
Percentage of anticipated commodity purchases or production hedged over future hedging period, low end of range (as a percent) |  | 8.00% |  |
Percentage of anticipated commodity purchases or production hedged over future hedging period, high end of range (as a percent) |  | 30.00% |  |
Number of months for which hedges for future monthly commodity purchases, sales or production have been made (in months) |  | 9 |  |
Ethanol | Designated As Hedging Instrument [Member] |  |  |  |
Historical time period of hedge volumes (in months) |  | 12 |  |
Commodity sales volume hedged during historical hedging period, low end of range (in gallons) |  | 10,000,000 |  |
Commodity sales volume hedged during historical hedging period, high end of range (in gallons) |  | 19,000,000 |  |
Contracted commodity sales volume hedged over future hedging period, low end of range (in gallons) |  | 2,000,000 |  |
Contracted commodity sales volume hedged over future hedging period, high end of range (in gallons) |  | 14,000,000 |  |
Number of months for which hedges for future monthly commodity purchases, sales or production have been made (in months) |  | 6 |  |

X
- Definition High end of the range of the entity's contracted commodity sales volumes hedged during the historical hedging period. + References No definition available. + Details
Name: | adm_CommodityHedgedDuringHistoricalHedgingPeriodHighEnd
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Balance Type: | na
Period Type: | duration

X
- Definition Low end of the range of the entity's contracted commodity sales volumes hedged during the historical hedging period. + References No definition available. + Details
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Namespace Prefix: | adm_
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Balance Type: | na
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X
- Definition High end of the range of the contracted sales volume hedged by the company over the future hedging period. + References No definition available. + Details
Name: | adm_ContractedCommodityHedgedOverFutureHedgingPeriodHighEnd
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Balance Type: | na
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- Definition Low end of the range of the contracted sales volume hedged by the company over the future hedging period. + References No definition available. + Details
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X
- Definition The amount of net gain (loss) remaining in AOCI from discontinued interest rate cash flow hedge(s). Such hedges were discontinued at a prior date due to a change in the certainty of the hedged transaction from probable to possible. This amount will be amortized over the life of the hedged transaction once the transaction occurs, or upon further decline in certainty it will be recognized in earnings. + References No definition available. + Details
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X
- Definition The amount of net gain (loss) remaining in AOCI from discontinued interest rate cash flow hedge(s) net of amortization. Net of tax. + References No definition available. + Details
Name: | adm_DeferredGainLossOnDiscontinuationOfInterestRateCashFlowHedgeAfterTaxAccumulatedOtherComprehensiveIncomeNetOfAmortization
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- Definition Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps that will be recognized in earnings. + References No definition available. + Details
Name: | adm_DeferredGainLossOnTreasuryLockAgreementsAndInterestRateSwapsCashFlowHedgeAfterTaxAccumulatedOtherComprehensiveIncomeToBeRecognizedInEarnings
Namespace Prefix: | adm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The period of time for which the entity discloses its historical hedging percentages. + References No definition available. + Details
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Balance Type: | na
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- Definition The period of time for which the entity discloses its historical hedging gallons. + References No definition available. + Details
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- Definition The forward time period for which hedges have been made as of the balance sheet date. + References No definition available. + Details
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- Definition Description of treasury lock and interest rate swap transactions that will result in the reclassification into earnings of gains (losses) reported in accumulated other comprehensive income. Includes the time period range over which gains (losses) will be reclassified to earnings (high end of range). + References No definition available. + Details
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- Definition Description of treasury lock and interest rate swap transactions that will result in the reclassification into earnings of gains (losses) reported in accumulated other comprehensive income. Includes the time period range over which gains (losses) will be reclassified to earnings (low end of range). + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) after tax related to the increase (decrease) in fair value of foreign exchange contracts designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income. + References No definition available. + Details
Name: | adm_GainLossOnForeignExchangeContractsCashFlowHedgesAfterTaxAccumulatedOtherComprehensiveIncome
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- Definition Amount of unrealized gain (loss) after tax related to the increase (decrease) in fair value of foreign exchange contracts designated as cash flow hedging instruments, that will be reclassified from accumulated other comprehensive income into earnings over the life of the hedged transaction. + References No definition available. + Details
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X
- Definition This element represents the volume of natural gas used by the entity's production facilities per month under the designated cash flow hedge program. + References No definition available. + Details
Name: | adm_NaturalGasProductionFacilities
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X
- Definition High end of the range of the percentage of the entity's anticipated commodity purchases or production hedged during the historical hedging period. + References No definition available. + Details
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Period Type: | duration

X
- Definition Low end of the range of the percentage of the entity's anticipated commodity purchases or production hedged during the historical hedging period. + References No definition available. + Details
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X
- Definition High end of the range of the percentage of the entity's anticipated commodity purchases or production hedged over the forward hedging period. + References No definition available. + Details
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- Definition Low end of the range of the percentage of the entity's anticipated commodity purchases or production hedged over the forward hedging period. + References No definition available. + Details
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Namespace Prefix: | adm_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition This element represents the quantity of corn processing per month under the designated cash flow hedge program. + References No definition available. + Details
Name: | adm_ProcessingOfCornPerMonth
Namespace Prefix: | adm_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of unrealized gain (loss) after tax related to the increase (decrease) in fair value of price risk derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Description of the transactions or other events that will result in the reclassification into earnings of gains or losses reported in accumulated other comprehensive income. Includes time period over which gains or losses will be reclassified to earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994 + Details
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- Definition The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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- Definition Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994 + Details
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