Inventories, Derivative Instruments & Hedging Activities (Narrative) (Details) (USD $)	12 Months Ended							12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Not Designated As Hedging Instrument [Member]	Jun. 30, 2010 Not Designated As Hedging Instrument [Member]	Jun. 30, 2012 Not Designated As Hedging Instrument [Member]	Mar. 31, 2010 Not Designated As Hedging Instrument [Member]	Jun. 30, 2012 Designated As Hedging Instrument [Member]	Jun. 30, 2012 Foreign Currency Exchange [Member] Designated As Hedging Instrument [Member]	Jun. 30, 2012 Corn [Member] Designated As Hedging Instrument [Member] bu	Jun. 30, 2012 Natural Gas [Member] Designated As Hedging Instrument [Member] MMBTU	Jun. 30, 2012 Ethanol [Member] Designated As Hedging Instrument [Member] gal
Derivative [Line Items]
After-tax earnings increase resulting from a liquidating effect on LIFO reserves	$ 59,000,000
After-tax earnings increase resulting from a liquidating effect on LIFO reserves (per share)	0.09
After-tax gains deferred in AOCI on discontinuation of hedge accounting treatment on interest rate swaps							21,000,000
Gains (losses) on interest rate swaps		30,000,000	(59,000,000)	30,000,000	(59,000,000)
Amortization period for gains on de-designated hedges in AOCI	30 years
After-tax gains in AOCI from commodity cash flow hedge transactions								28,000,000
After-tax gains in AOCI from commodity cash flow hedge transactions expected to be recognized in earnings.								28,000,000
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										12 months	12 months
Percentage of anticipated commodity purchases or production hedged during historical hedging period, low end of range (as a percent)										1.00%	19.00%
Percentage of anticipated commodity purchases or production hedged during historical hedging period, high end of range (as a percent)										100.00%	38.00%
Percentage of anticipated commodity purchases or production hedged over future hedging period, low end of range (as a percent)										1.00%	8.00%
Percentage of anticipated commodity purchases or production hedged over future hedging period, high end of range (as a percent)										26.00%	19.00%
Historical time period of hedge volumes												12 months
Commodity sales volume hedged during historical hedging period, low end of range (in gallons)												10,000,000
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)												7,000,000
Contracted commodity sales volume hedged over future hedging period, high end of range (in gallons)												15,000,000
Number of months for which hedges for future monthly commodity purchases, sales or production have been made										20 months	12 months	6 months
Historical time period of hedged amounts									12 months
Foreign currency expenditures hedged durring historical hedging period, low end of range									24,000,000
Foreign currency expenditures hedged during historical hedging period, high end of range									30,000,000
Foreign currency expenditures hedged									24,000,000
After-tax losses in AOCI related to foreign exchange contracts designated as cash flow hedging instruments									3,000,000
Cash flow hedge losses that will be recognized in earnings									3,000,000
Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps								22,000,000
Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps that will be recognized in earnings								22,000,000
Deferred Gain Loss on Discontinuation of Interest Rate Cash Flow Hedge after Tax Accumulated Other Comprehensive Income Net of Amortization						$ 20,000,000
Number of years in which after-tax gains (losses) 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 (losses) in AOCI related to treasury-lock agreements and interest rate swaps will be recognized in earnings, high end of range								30 years