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Short-term Borrowings and Long-term Debt (Tables)
 6 Months Ended
Jun. 30, 2014
Debt Disclosure [Abstract]  
Schedule of Line of Credit Facilities [Table Text Block]
Revolving Credit Facility.   As of June 30, 2014 and December 31, 2013, CERC had the following revolving credit facility and utilization of such facility (in millions):
 
June 30, 2014
 
December 31, 2013
Size of
Facility
Loans
 
Letters
of Credit
 
Commercial
Paper
 
Loans
 
Letters
of Credit
 
Commercial
Paper
$
600

$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
118