Derivative Instruments and Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended
	Mar. 31, 2014 bu	Mar. 31, 2014 Designated As Hedging Instrument [Member]	Dec. 31, 2013 Designated As Hedging Instrument [Member]	Mar. 31, 2014 Corn [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2014 Ethanol [Member] Designated As Hedging Instrument [Member] gal
Derivative [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	$ 4	$ 4	$ 9
After-tax losses in AOCI from commodity cash flow hedge transactions		$ 80
Number of months price risk cash flow hedges gain loss will be recognized in earnings	12 months
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)				16.00%
Percentage of anticipated commodity purchases or production hedged during historical hedging period, high end of range (as a percent)				51.00%
Number of months for which hedges for future monthly commodity purchases, sales or production have been made				21 months	12 months
Percentage of anticipated commodity purchases or production hedged over future hedging period, low end of range (as a percent)				0.00%
Percentage of anticipated commodity purchases or production hedged over future hedging period, high end of range (as a percent)				71.00%
Derivative Hedged Item Past Period of Time Hedged Volumes					12 months
Commodity sales volume hedged during historical hedging period, low end of range (in gallons)					8,000,000
Commodity sales volume hedged during historical hedging period, high end of range (in gallons)					92,000,000
Contracted commodity sales volume hedged over future hedging period, low end of range (in gallons)					0
Contracted commodity sales volume hedged over future hedging period, high end of range (in gallons)					121,000,000