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Regulatory Accounting	3 Months Ended
Regulatory Accounting	Mar. 31, 2015
regulatory accounting [Abstract]
Regulatory Matters [Text Block]	Regulatory Accounting As of March 31, 2015, CenterPoint Houston has not recognized an allowed equity return of $433 million because such return will be recognized as it is recovered in rates. During the three months ended March 31, 2015 and 2014, CenterPoint Houston recognized approximately $9 million and $15 million, respectively, of the allowed equity return not previously recognized.