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Goodwill Goodwill (Tables)
 9 Months Ended
Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
Goodwill by reportable business segment as of December 31, 2012 and changes in the carrying amount of goodwill as of September 30, 2013 are as follows (in millions):
 
December 31, 2012
 
Contributed to Enable
 
September 30, 2013
Natural Gas Distribution
$
746

 
$
—

 
$
746

Interstate Pipelines
579

 
579

 
—

Competitive Natural Gas Sales and Services
83

 
—

 
83

Field Services
49

 
49

 
—

Other Operations
11

 
—

 
11

Total
$
1,468

 
$
628

 
$
840