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Related Party Transactions (Details) (USD $)
0 Months Ended 3 Months Ended 1 Months Ended
Mar. 10, 2014
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
IEP Energy LLC
Mar. 31, 2014
Insight Portfolio Group (formerly Icahn Sourcing, LLC)
Mar. 31, 2013
Insight Portfolio Group (formerly Icahn Sourcing, LLC)
Mar. 31, 2014
AEPC
Mar. 31, 2013
AEPC
Apr. 30, 2014
Subsequent event
AEPC
Related Party Transactions                  
Ownership percentage held by controlling stockholder       82.00%          
Total dividends paid per common share (in dollars per share) $ 0.75                
Total dividends paid $ 65,100,000                
Payments of dividends to related party 53,400,000                
Due to parent   82,700,000 100,000       82,700,000    
Federal taxes paid to AEPC under the Tax Allocation Agreement             0 0 49,000,000
Payment to related party         $ 100,000 $ 100,000