Unaudited Quarterly Information

12 Months Ended

Dec. 31, 2012

Unaudited Quarterly Information [Abstract]

Quarterly Financial Information [Text Block]

Unaudited Quarterly Information

Summarized quarterly financial data is as follows:



	Year Ended December 31, 2011
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	(in millions)
Revenues	$	489	$	606	$	707	$	535
Operating income	101		185		244		93
Income before extraordinary item (1)	24		79		367		18
Extraordinary item, net of tax (1)	—		—		598		—
Net income	24		79		965		18


(1)	During the third quarter of 2011, CenterPoint Energy recorded an extraordinary gain of $598 million, after-tax, related to the Final Order and a $229 million, after-tax, return on true-up balance included in Income before extraordinary item related to a portion of interest on the appealed amount as discussed in Note 4(b).



	December 31, 2012
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	(in millions, except per share amounts)
Revenues	$	531	$	676	$	748	$	585
Operating income	107		191		242		99
Net income	36		78		138		27

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

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