Quarterly Financial Data (Narrative) (Details) (USD $)	3 Months Ended								6 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Quarterly Financial Data [Abstract]
After-tax facility exit and other related costs		$ 107,000,000		$ 222,000,000
After-tax facility exit and other related costs (per share)		0.16		0.33
After-tax gain on interest in Grain Corp	49,000,000
After-tax gain on interest in Grain Corp (per share)	$ 0.07
After-tax gain related to the sale of exchange membership interests	24,000,000
After-tax gain related to the sale of exchange membership interests (per share)	$ 0.04
After-tax pension settlement charges	44,000,000
After-tax pension settlement charges (per share)	$ 0.07
After-tax restructuring and related cost, incurred cost			52,000,000
After-tax restructuring and related cost, cost incurred (per share)			0.08
After-tax start up costs for new greenfield plants					11,000,000	14,000,000	14,000,000	20,000,000
After-tax start up costs for new greenfield plants (per share)					$ 0.02	$ 0.02	$ 0.02	$ 0.03
Charges from early extinguishment of debt					15,000,000				5,000,000	12,000,000	12,000,000	15,000,000	75,000,000
After-tax charges from debt buyback or exchange					9,000,000
After-tax charges from debt buyback or exchange (per share)					0.01
Pre-tax gain on sale of bank securities of equity investee					78,000,000
After-tax gain on sale of bank securities of equity investee					49,000,000
After-tax gain on sale of bank securities of equity investee (per share)					$ 0.07
Pre-tax gain related to the acquisition of the remaining interest in Golden Peanut							71,000,000					71,000,000
After-tax gain related to the acquisition of the remaining interest in Golden Peanut							44,000,000
After-tax gain related to the acquisition of the remaining interest in Golden Peanut (per share)							$ 0.07
After-tax (losses) gains on interest rate swap after tax						4,000,000	34,000,000	(19,000,000)
After-tax (losses) gains on interest rate swap (per share)						$ 0.01	$ 0.05	$ (0.03)
After-tax increase to earnings due to adjustments to machinery and equipment assets					$ 28,000,000	$ 31,000,000	$ 24,000,000
After-tax increase to earnings due to adjustments to machinery and equipment assets (per share)					$ 0.04	$ 0.05	$ 0.04