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Derivative Instruments and Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified |  |  | 3 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Designated As Hedging Instrument [Member] | Mar. 31, 2013 Corn [Member] Designated As Hedging Instrument [Member] bu | Mar. 31, 2013 Natural gas [Member] Designated As Hedging Instrument [Member] MMBTU | Mar. 31, 2013 Ethanol [Member] Designated As Hedging Instrument [Member] gal | Mar. 31, 2013 Corn Gluten Meal [Member] Designated As Hedging Instrument [Member] T | Mar. 31, 2013 Foreign Currency Exchange [Member] Designated As Hedging Instrument [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |
Long-term marketable securities | $ 683 | $ 717 |  |  |  |  |  |
After-tax losses in AOCI from commodity cash flow hedge transactions |  |  | 8 |  |  |  |  |
After-tax losses in AOCI from commodity cash flow hedge transactions expected to be recognized in earnings. |  |  | 8 |  |  |  |  |
Number of months cash flow hedge losses will be recognized in earnings |  |  | 12 months |  |  |  |  |
Corn processed per month (in bushels) |  |  |  | 76,000,000 |  |  |  |
Natural gas used by production facilities per month (in MMbtus) |  |  |  |  | 3,800,000 |  |  |
Historical time period of hedge percentages |  |  |  | 12 months | 12 months |  |  |
Percentage of anticipated commodity purchases or production hedged during historical hedging period, low end of range (as a percent) |  |  |  | 15.00% | 11.00% |  |  |
Percentage of anticipated commodity purchases or production hedged during historical hedging period, high end of range (as a percent) |  |  |  | 26.00% | 66.00% |  |  |
Percentage of anticipated commodity purchases or production hedged over future hedging period, low end of range (as a percent) |  |  |  | 0.10% | 13.00% |  |  |
Percentage of anticipated commodity purchases or production hedged over future hedging period, high end of range (as a percent) |  |  |  | 19.00% | 49.00% |  |  |
Historical time period of hedge volumes |  |  |  |  |  | 12 months |  |
Commodity sales volume hedged during historical hedging period, low end of range (in gallons) |  |  |  |  |  | 1,000,000 |  |
Commodity sales volume hedged during historical hedging period, high end of range (in gallons) |  |  |  |  |  | 21,000,000 |  |
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) |  |  |  |  |  | 12,000,000 |  |
Contracted commodity sales weight hedged over future hedging period, high end of range (in tons) |  |  |  |  |  |  | 23,000 |
Number of months for which hedges for future monthly commodity purchases, sales or production have been made |  |  |  | 15 months | 9 months | 9 months | 12 months |
Historical time period of hedged amounts |  |  |  |  |  |  |  | 12 months
Foreign currency expenditures hedged during historical hedging period, low end of range |  |  |  |  |  |  |  | 13
Foreign currency expenditures hedged during historical hedging period, high end of range |  |  |  |  |  |  |  | 25
Foreign currency expenditures hedged |  |  |  |  |  |  |  | 13
After-tax losses in AOCI related to foreign exchange contracts designated as cash flow hedging instruments |  |  |  |  |  |  |  | 1
Cash flow hedge losses that will be recognized in earnings |  |  |  |  |  |  |  | 1
Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps |  |  | 21 |  |  |  |  |
Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps that will be recognized in earnings |  |  | $ 21 |  |  |  |  |
Number of years in which after-tax gains in AOCI related to treasury-lock agreements and interest rate swaps will be recognized in earnings, low end of range |  |  | 10 years |  |  |  |  |
Number of years in which after-tax gains in AOCI related to treasury-lock agreements and interest rate swaps will be recognized in earnings, high end of range |  |  | 30 years |  |  |  |  |

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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Data Type: | num:volumeItemType
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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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
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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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- Definition High end of the range of the contracted sales weight hedged by the company over hte future hedging period. + References No definition available. + Details
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- Definition Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps. + References No definition available. + Details
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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
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- Definition The period of time for which the entity discloses its historical hedging percentages. + References No definition available. + Details
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- Definition The period of time for which the entity disclosed its historical hedged amounts. + References No definition available. + Details
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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 the entities forecasted foreign currency expenditures hedged at the end of the period. + References No definition available. + Details
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- Definition High end of the range of the entities forecasted foreign currency expenditures hedged during the historical hedging period. + References No definition available. + Details
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- Definition Low end of the range of the entities forecasted foreign currency expenditures hedged during the historical hedging period. + 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
Name: | adm_GainLossOnForeignExchangeContractsCashFlowHedgesAfterTaxReclassificationToEarnings
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- 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
Namespace Prefix: | adm_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of months price rish cash flow hedges will be recognized in earnings. + References No definition available. + Details
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- 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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Namespace Prefix: | adm_
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Period Type: | duration

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- 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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Namespace Prefix: | adm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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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Namespace Prefix: | adm_
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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
Name: | adm_PercentageOfAnticipatedCommodityHedgedOverFutureHedgingPeriodLowEnd
Namespace Prefix: | adm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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: | num:volumeItemType
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
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- Definition The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 Reference 2: 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. + Details
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