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Discontinued Operations (Tables) (Discontinued Operations [Member])
 3 Months Ended
Mar. 31, 2013
Discontinued Operations [Member]
  
Operating Results For Retail Natural Gas Supply Business
     Three Months Ended
March  31,		  
     2013     2012  
     (millions of dollars)  

Income from operations of discontinued operations, net of income taxes

    $ 2     $ 5   

Unrealized losses associated with retail natural gas supply contracts, net of income taxes

      (2 )     —    
  

 

 

    

 

 

  

Income From Discontinued Operations, Net of Income Taxes

    $  —       $ 5