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Short-term Borrowings and Long-term Debt (Tables)
 9 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]  
Schedule of Line of Credit Facilities [Table Text Block]
Revolving Credit Facility.   As of December 31, 2012 and September 30, 2013, CERC had the following revolving credit facility and utilization of such facility (in millions):
 
 
December 31, 2012
 
 
September 30, 2013
Size of
Facility
 
Loans
 
Letters
of Credit
 
Commercial
Paper
 
Size of Facility
Loans
 
Letters
of Credit
 
Commercial
Paper
$
950

 
$
—

 
$
—

 
$
—

 
600

$
—

 
$
—

 
$
—