Derivative Instruments and Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2012
Designated As Hedging Instrument [Member]
Derivative [Line Items]
After-tax gains in AOCI from commodity cash flow hedge transactions	$ 58
After-tax gains in AOCI from commodity cash flow hedge transactions expected to be recognized in earnings.	57
Number of months cash flow hedges gains will be recognized in earnings	12 months
Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps	22
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
GrainCorp Limited [Member] | Not Designated As Hedging Instrument [Member]
Derivative [Line Items]
Economic interest held by the Company, as a percent	4.70%
Corn [Member] | Designated As Hedging Instrument [Member]
Derivative [Line Items]
Corn processed per month (in bushels)	76,000,000
Historical time period of hedge percentages	12 months
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)	1.00%
Percentage of anticipated commodity purchases or production hedged over future hedging period, high end of range (as a percent)	20.00%
Number of months for which hedges for future monthly commodity purchases, sales or production have been made	17 months
Natural gas [Member] | Designated As Hedging Instrument [Member]
Derivative [Line Items]
Natural gas used by production facilities per month (in MMbtus)	3,800,000
Historical time period of hedge percentages	12 months
Percentage of anticipated commodity purchases or production hedged during historical hedging period, low end of range (as a percent)	19.00%
Percentage of anticipated commodity purchases or production hedged during historical hedging period, high end of range (as a percent)	30.00%
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)	49.00%
Number of months for which hedges for future monthly commodity purchases, sales or production have been made	15 months
Ethanol [Member] | Designated As Hedging Instrument [Member]
Derivative [Line Items]
Historical time period of hedge volumes	12 months
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)	21,000,000
Contracted commodity sales volume hedged over future hedging period, low end of range (in gallons)	400,000
Contracted commodity sales volume hedged over future hedging period, high end of range (in gallons)	11,000,000
Number of months for which hedges for future monthly commodity purchases, sales or production have been made	4 months
Foreign Currency Exchange [Member] | Designated As Hedging Instrument [Member]
Derivative [Line Items]
Historical time period of hedged amounts	12 months
Foreign currency expenditures hedged during historical hedging period, low end of range	24
Foreign currency expenditures hedged during historical hedging period, high end of range	30
Foreign currency expenditures hedged	25
After-tax losses in AOCI related to foreign exchange contracts designated as cash flow hedging instruments	$ 2