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Employee Benefit Plans (Actual Asset Allocation For Global Pension Plan Assets) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Jun. 30, 2012 | Jun. 30, 2011
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset allocation | 100.00% | 100.00% | 100.00%
Cash dividend received on employer's common stock under pension plans | $ 0 | $ 0 | $ 0.1
Pension Benefits [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset allocation | 52.00% | 51.00% | 52.00%
Pension Benefits [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset allocation | 47.00% | 48.00% | 47.00%
Pension Benefits [Member] | Other Pension Plan Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset allocation | 1.00% | 1.00% | 1.00%
U.S. Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of U.S. pension plan to global pension plan assets (as a percent) | 67.00% |  |
U.S. Pension Plans [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset allocation | 60.00% |  |
U.S. Pension Plans [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset allocation | 40.00% |  |
Foreign Pension Plans [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset allocation | 36.00% |  |
Foreign Pension Plans [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset allocation | 61.00% |  |
Foreign Pension Plans [Member] | Other Pension Plan Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset allocation | 3.00% |  |

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- Definition Cash dividends received on the reporting entity's shares held by its pension plans. + 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 The percentage of US pension plan assets to global pension plan assets. + References No definition available. + Details
Name: | adm_PercentageOfUSPensionPlanToGlobalPensionPlanAssets
Namespace Prefix: | adm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: | na
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(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. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant