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Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes The effective tax rate reported for the three months ended March 31, 2015 was 35%, compared to 36% for the same period in 2014. The lower effective tax rate for the three months ended March 31, 2015 was primarily attributable to the favorable impact of permanent tax benefits. CenterPoint Houston reported no uncertain tax liability as of March 31, 2015 and expects no significant change to the uncertain tax liability over the next twelve months. Tax years through 2011 have been audited and settled with the Internal Revenue Service (IRS). CenterPoint Energy’s consolidated federal income tax returns for the years 2012 and 2013 are currently under audit by the IRS. For 2014 and 2015, CenterPoint Energy is a participant in the IRS’s Compliance Assurance Process.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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