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Subsequent Events (CenterPoint Energy and CERC) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Aug. 01, 2018
Jul. 26, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Subsequent Event [Line Items]            
Quarterly cash dividend/distribution declared per share     $ 0.2775 $ 0.2675 $ 0.2775 $ 0.5350
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Dividends payable, date declared   Jul. 26, 2018        
Quarterly cash dividend/distribution declared per share   $ 0.2775        
Dividends payable, date to be paid   Sep. 13, 2018        
Dividends payable, date of record   Aug. 16, 2018        
Subsequent Event [Member] | Enable Midstream Partners [Member] | Common Units [Member]            
Subsequent Event [Line Items]            
Dividends payable, date declared Aug. 01, 2018          
Quarterly cash dividend/distribution declared per share $ 0.318          
Expected cash distribution from equity method investment $ 74          
Subsequent Event [Member] | Enable Midstream Partners [Member] | Series A Preferred Units [Member]            
Subsequent Event [Line Items]            
Dividends payable, date declared Aug. 01, 2018          
Preferred stock dividends declared per share $ 0.625          
Expected cash distribution from cost method investment $ 9