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Regulatory Accounting
3 Months Ended
Mar. 31, 2017
regulatory accounting [Abstract]  
Regulatory Accounting [Text Block]
Regulatory Accounting

As of March 31, 2017, Houston Electric has not recognized an allowed equity return of $322 million because such return will be recognized as it is recovered in rates.  During the three months ended March 31, 2017 and 2016, Houston Electric recognized approximately $7 million and $13 million, respectively, of the allowed equity return not previously recognized.