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Acquisitions and Investments Acquisitions and Investments (Investments in Ethanol Companies) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Jun. 30, 2014
TACE
Jun. 30, 2014
TAME
Jun. 30, 2014
TAME
TAEI
Jun. 30, 2014
TAAE
Oct. 01, 2013
TAAE
Aug. 01, 2013
Ethanol Interests From Mitsui
Companies
Aug. 01, 2013
Ethanol Interests From Mitsui
TACE
Aug. 01, 2013
Ethanol Interests From Mitsui
TAEI
Aug. 01, 2013
Ethanol Interests From Mitsui
TAAE
Schedule of Equity Method Investments [Line Items]                  
Number of businesses in which ownership interests acquired           3      
Cash paid to acquire equity method investments           $ 75      
Ownership percentage acquired             24.00% 34.00% 40.00%
Equity method investments, ownership percentage 60.00% 67.00% 50.00% 43.00% 43.00%