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Fair Value Measurements (Narrative) (Details) (Weighted Average [Member], Fair Value, Measurements, Recurring [Member], Significant Unobservable Inputs (Level 3) [Member])
Mar. 31, 2015
Dec. 31, 2014
Inventory Related Payables [Member]
    
Fair Value Measurements [Line Items]    
Basis 40.10%adm_Basis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= adm_InventoryRelatedPayablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 43.40%adm_Basis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= adm_InventoryRelatedPayablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Inventories Carried At Market [Member]
    
Fair Value Measurements [Line Items]    
Basis 18.10%adm_Basis
/ us-gaap_FairValueByAssetClassAxis
= adm_InventoriesCarriedAtMarketMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 23.40%adm_Basis
/ us-gaap_FairValueByAssetClassAxis
= adm_InventoriesCarriedAtMarketMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember