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Short-Term Borrowings and Long-term Debt Credit Facilities (Tables)
6 Months Ended
Jun. 30, 2014
Debt Disclosure [Abstract]  
Schedule of Line of Credit Facilities [Table Text Block]
Credit Facilities. As of June 30, 2014 and December 31, 2013, CenterPoint Energy, CenterPoint Houston and CERC Corp. had the following revolving credit facilities and utilization of such facilities (in millions):
 
 
 
June 30, 2014
 
December 31, 2013
 
Size of
Facility
 
Loans
 
Letters
of Credit
 
Commercial
Paper
 
Loans
 
Letters
of Credit
 
Commercial
Paper
CenterPoint Energy
$
1,200

 
$

 
$
6

 
$
41

 
$

 
$
6

 
$

CenterPoint Houston
300

 

 
4

 

 

 
4

 

CERC Corp.
600

 

 

 

 

 

 
118

Total
$
2,100

 
$

 
$
10

 
$
41

 
$

 
$
10

 
$
118