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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Commodity Derivative Activity Recorded in Statement of Consolidated Operations

The following table summarizes the effect of derivative instruments on the Company’s statement of consolidated operations:

 

   

Gain (Loss) on Derivatives

Recognized in Income

         For the Year Ended December 31,  
          2015           2014           2013  
              (In millions)  

Loss on cash flow hedges reclassified from accumulated other comprehensive loss

   Oil and Gas Production Revenues   $                      -     $                      -      $          (16)   

Loss for ineffectiveness on cash flow hedges

   Revenues and Other: Other   $          -     $          -      $          (1)   

Derivatives not designated as cash flow hedges:

              

Realized loss

     $          -     $          (16)      $          (178)   

Unrealized gain (loss)

         -         300          (221)   
     

 

 

      

 

 

      

 

 

  

Gain (loss) on derivatives not designated as cash flow hedges

   Revenues and Other: Other   $          -     $          284      $          (399)