Derivative Financial Instruments (Schedule Of Open Position Derivative Financial Instruments) (Details) lb in Thousands, gal in Thousands, bu in Thousands, T in Thousands, MMBTU in Thousands	Dec. 31, 2019 lb gal T bu MMBTU
Corn [Member] | Exchange Traded [Member] | Long [Member] | Cash Flow Hedges [Member] | Options [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | bu	201	[1]
Corn [Member] | Exchange Traded [Member] | Long [Member] | Fair Value Hedging [Member] | Futures [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | bu	7,000	[1],[2],[3]
Ethanol [Member] | Exchange Traded [Member] | Long [Member] | Options [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | gal	20,954	[1]
Ethanol [Member] | Exchange Traded [Member] | Short [Member] | Futures [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | gal	9,702	[1]
Ethanol [Member] | Exchange Traded [Member] | Short [Member] | Cash Flow Hedges [Member] | Futures [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | gal	41,664	[1],[3]
Ethanol [Member] | Non-Exchange Traded [Member] | Long [Member] | Forwards [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | gal	26,208	[4]
Ethanol [Member] | Non-Exchange Traded [Member] | Short [Member] | Forwards [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | gal	389,298	[4]
Natural Gas In MMBTU [Member] | Exchange Traded [Member] | Short [Member] | Cash Flow Hedges [Member] | Futures [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | MMBTU	8,428	[1]
Natural Gas In MMBTU [Member] | Exchange Traded [Member] | Short [Member] | Fair Value Hedging [Member] | Futures [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | MMBTU	9,088	[1],[2],[3]
Natural Gas In MMBTU [Member] | Non-Exchange Traded [Member] | Long [Member] | Forwards [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | MMBTU	12,539	[4]
Natural Gas In MMBTU [Member] | Non-Exchange Traded [Member] | Short [Member] | Forwards [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | MMBTU	1,736	[4]
Corn And Soybeans In Bushels [Member] | Exchange Traded [Member] | Short [Member] | Futures [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | bu	22,445	[1]
Corn And Soybeans In Bushels [Member] | Non-Exchange Traded [Member] | Long [Member] | Forwards [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | bu	29,511	[4]
Corn And Soybeans In Bushels [Member] | Non-Exchange Traded [Member] | Short [Member] | Forwards [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | bu	1,374	[4]
DDG [Member] | Non-Exchange Traded [Member] | Long [Member] | Forwards [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | T	137	[4]
DDG [Member] | Non-Exchange Traded [Member] | Short [Member] | Forwards [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | T	592	[4]
Corn Oil [Member] | Non-Exchange Traded [Member] | Long [Member] | Forwards [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | lb	3,840	[4]
Corn Oil [Member] | Non-Exchange Traded [Member] | Short [Member] | Forwards [Member]
Derivative [Line Items]
Volumes of open commodity derivatives | lb	131,616	[4]

[1] Exchange traded futures and options are presented on a net long and (short) position basis. Options are presented on a delta-adjusted basis.

[2] Futures or non-exchange traded forwards used for fair value hedges.

[3] Futures used for cash flow hedges.

[4] Non-exchange traded forwards are presented on a gross long and (short) position basis including both fixed-price and basis contracts.