Reportable Business Segments (Tables)

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

Financial data for business segments are as follows (in millions):

	For the Three Months Ended March 31, 2014
	Revenues from External Customers		Inter-segment Revenues			Operating Income			Total Assets as of March 31, 2014
Natural Gas Distribution	$	1,478	$	9		$	162		$	5,104
Energy Services	1,052		32			26			1,053
Midstream Investments (1)	—		—			—			4,540
Other	1		—			—			1,320
Reconciling Eliminations	—		(41		)	—			(1,237		)
Consolidated	$	2,531	$	—		$	188		$	10,780
	For the Three Months Ended March 31, 2013
	Revenues from External Customers		Inter-segment Revenues			Operating Income (Loss)			Total Assets as of December 31, 2013
Natural Gas Distribution	$	1,043	$	8		$	139		$	4,976
Energy Services	588		9			7			895
Interstate Pipelines	92		40			52			—
Field Services	130		11			53			—
Midstream Investments (1)	—		—			—			4,518
Other	—		—			(1		)	1,149
Reconciling Eliminations	—		(68		)	—			(996		)
Consolidated	$	1,853	$	—		$	250		$	10,542

(1) Midstream Investments reported equity earnings of $88 million from Enable and $3 million of equity earnings from CenterPoint Energy’s retained interest in SESH for the three months ended March 31, 2014. Included in total assets of Midstream Investments as of March 31, 2014 and December 31, 2013 is $4,340 million and $4,319 million, respectively, related to CenterPoint Energy’s investment in Enable and $200 million and $199 million, respectively, related to CenterPoint Energy’s retained interest in SESH.