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Equity Method Investments And Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Schedule of Equity Method Investments [Line Items]      
Noncontrolling Interest in Variable Interest Entity $ 40    
Payment to Partner $ 8    
EBIC Ammonia Project [Member] | Parent Company [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership Percentage In Development Corporation Which Has Minority Interest In Company That Consolidates VIE   65.00%  
EBIC Ammonia Project [Member] | Development Corporation [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership Percentage Of Development Corporation In Company That Consolidates VIE   25.00%  
EBIC Ammonia Project [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investments   $ 38  
Transactions with Related Parties [Member]      
Schedule of Equity Method Investments [Line Items]      
Revenue from Related Parties   $ 127 $ 144