Long-term Debt (Tables)

9 Months Ended

Sep. 30, 2012

Line of Credit Facility [Line Items]

Schedule of Line of Credit Facilities [Table Text Block]

Revolving Credit Facility. As of December 31, 2011 and September 30, 2012, CenterPoint Houston had the following revolving credit facility and utilization of such facility (in millions):

		December 31, 2011				September 30, 2012
Size of Facility		Loans		Letters of Credit		Loans		Letters of Credit
$	300	$	—	$	4	$	—	$	4