Long-term Debt (Tables)

6 Months Ended

Jun. 30, 2015

Line of Credit Facility [Line Items]

Schedule of Line of Credit Facilities [Table Text Block]

Revolving Credit Facility. As of June 30, 2015 and December 31, 2014, CenterPoint Houston had the following revolving credit facility and utilization of such facility (in millions):

		June 30, 2015				December 31, 2014
Size of Facility		Loans		Letters of Credit		Loans		Letters of Credit
$	300	$	—	$	4	$	—	$	4