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Inventories, Derivative Instruments and Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  | 6 Months Ended | 12 Months Ended |  | 6 Months Ended |  | 6 Months Ended
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Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2012 Not Designated As Hedging Instrument [Member] | Jun. 30, 2011 Not Designated As Hedging Instrument [Member] | Jun. 30, 2010 Not Designated As Hedging Instrument [Member] | Mar. 31, 2010 Not Designated As Hedging Instrument [Member] | Dec. 31, 2012 Designated As Hedging Instrument [Member] | Dec. 31, 2012 GrainCorp Limited [Member] | Dec. 31, 2012 Corn [Member] Designated As Hedging Instrument [Member] bu | Dec. 31, 2012 Natural gas [Member] Designated As Hedging Instrument [Member] MMBTU | Dec. 31, 2012 Ethanol [Member] Designated As Hedging Instrument [Member] gal | Dec. 31, 2012 Foreign Currency Exchange [Member] Designated As Hedging Instrument [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
After-tax gains deferred in AOCI on discontinuation of hedge accounting treatment on interest rate swaps |  |  |  |  |  |  |  | $ 21 |  |  |  |  |  |
Gains (losses) on interest rate swaps | 30 | (59) |  |  |  | 30 | (59) |  |  |  |  |  |  |
Amortization period for gains on de-designated hedges in AOCI |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |
Economic interest held by the Company, as a percent |  |  |  |  |  |  |  |  |  | 19.90% |  |  |  |
Interest held by the Company recorded as a long-term marketable security, as a percent |  |  |  |  |  |  |  |  |  | 19.90% |  |  |  |
Long-term marketable securities | 666 |  | 717 | 262 |  |  |  |  |  |  |  |  |  |
After-tax losses in AOCI from commodity cash flow hedge transactions |  |  |  |  |  |  |  |  | 16 |  |  |  |  |
After-tax losses in AOCI from commodity cash flow hedge transactions expected to be recognized in earnings. |  |  |  |  |  |  |  |  | 16 |  |  |  |  |
Number of months cash flow hedges gains 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 |  |  |  |  |  |  |  |  |  |  | 6 months | 6 months | 6 months |
Percentage of anticipated commodity purchases or production hedged during historical hedging period, low end of range (as a percent) |  |  |  |  |  |  |  |  |  |  | 19.00% | 11.00% |  |
Percentage of anticipated commodity purchases or production hedged during historical hedging period, high end of range (as a percent) |  |  |  |  |  |  |  |  |  |  | 26.00% | 19.00% |  |
Percentage of anticipated commodity purchases or production hedged over future hedging period, low end of range (as a percent) |  |  |  |  |  |  |  |  |  |  | 1.00% | 13.00% |  |
Percentage of anticipated commodity purchases or production hedged over future hedging period, high end of range (as a percent) |  |  |  |  |  |  |  |  |  |  | 18.00% | 66.00% |  |
Commodity sales volume hedged during historical hedging period, low end of range (in gallons) |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |
Commodity sales volume hedged during historical hedging period, high end of range (in gallons) |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |
Contracted commodity sales volume hedged over future hedging period, low end of range (in gallons) |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |
Contracted commodity sales volume hedged over future hedging period, high end of range (in gallons) |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |
Number of months for which hedges for future monthly commodity purchases, sales or production have been made |  |  |  |  |  |  |  |  |  |  | 14 months | 12 months | 6 months |
Historical time period of hedged amounts |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months
Foreign currency expenditures hedged during historical hedging period, low end of range |  |  |  |  |  |  |  |  |  |  |  |  |  | 19
Foreign currency expenditures hedged during historical hedging period, high end of range |  |  |  |  |  |  |  |  |  |  |  |  |  | 25
Foreign currency expenditures hedged |  |  |  |  |  |  |  |  |  |  |  |  |  | 19
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 |  |  |  |  |
Deferred Gain Loss on Discontinuation of Interest Rate Cash Flow Hedge after Tax Accumulated Other Comprehensive Income Net of Amortization |  |  |  |  |  |  |  |  | 19 |  |  |  |  |
Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps that will be recognized in earnings |  |  |  |  |  |  |  |  | $ 1 |  |  |  |  |
Number of months gain on treasury lock agreements and interest rate swaps will be recognized in earnings |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |

X
- Definition Period when adjustments to the carrying value of interest rate swap hedged items are amortized upon discontinuation of the hedge, in "PnYnMnDnS" format. + References No definition available. + Details
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- 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
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- 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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- 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 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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- 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
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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 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 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
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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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- Definition Equity financial instruments including (1) securities held-to-maturity and (2) securities avaliable-for-sale that will be held for the long-term represented as a percent. + References No definition available. + Details
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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
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- Definition Number of months price rish cash flow hedges will be recognized in earnings. + References No definition available. + Details
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- Definition Number of months treasury lock and interest rate cash flow hedge gain loss will be reclassified 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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- 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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- 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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- Definition This element represents the quantity of corn processing per month under the designated cash flow hedge program. + References No definition available. + 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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: 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. + Details
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