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Subsequent Events (CenterPoint Energy) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Sep. 12, 2019
Sep. 03, 2019
Aug. 27, 2019
Aug. 20, 2019
Aug. 19, 2019
Aug. 14, 2019
Aug. 02, 2019
Jul. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Subsequent Event [Line Items]                        
Dividends declared per share                 $ 0.2875 $ 0.2775 $ 0.2875 $ 0.2775
Common Stock [Member]                        
Subsequent Event [Line Items]                        
Dividends declared per share                 0.2875 0.2775 0.2875 0.2775
Series A Preferred Stock [Member]                        
Subsequent Event [Line Items]                        
Series B Preferred Stock dividends declared ($17.5000, $-0-, $17.5000, and $-0- per share, respectively)                 0.0000 0.0000 0.0000 0.0000
Series B Preferred Stock [Member]                        
Subsequent Event [Line Items]                        
Series B Preferred Stock dividends declared ($17.5000, $-0-, $17.5000, and $-0- per share, respectively)                 $ 17.5000 $ 0.0000 $ 17.5000 $ 0.0000
Subsequent Event [Member] | Common Stock [Member]                        
Subsequent Event [Line Items]                        
Dividends payable, date declared               Jul. 31, 2019        
Dividends payable, date of record         Aug. 15, 2019              
Dividends payable, date to be paid Sep. 12, 2019                      
Dividends declared per share               $ 0.2875        
Subsequent Event [Member] | Series A Preferred Stock [Member]                        
Subsequent Event [Line Items]                        
Dividends payable, date declared               Jul. 31, 2019        
Dividends payable, date of record         Aug. 15, 2019              
Dividends payable, date to be paid   Sep. 03, 2019                    
Series B Preferred Stock dividends declared ($17.5000, $-0-, $17.5000, and $-0- per share, respectively)               $ 30.6250        
Subsequent Event [Member] | Series B Preferred Stock [Member]                        
Subsequent Event [Line Items]                        
Dividends payable, date declared               Jul. 31, 2019        
Dividends payable, date of record         Aug. 15, 2019              
Dividends payable, date to be paid   Sep. 03, 2019                    
Series B Preferred Stock dividends declared ($17.5000, $-0-, $17.5000, and $-0- per share, respectively)               $ 17.5000        
Common Units [Member] | Subsequent Event [Member] | Enable Midstream Partners [Member]                        
Subsequent Event [Line Items]                        
Quarterly cash distribution, declaration date             Aug. 02, 2019          
Quarterly cash distribution, date of record       Aug. 20, 2019                
Quarterly cash distribution, distribution date     Aug. 27, 2019                  
Quarterly cash distribution declared per share             $ 0.3305          
Expected cash distribution from equity method investment             $ 77          
Series A Preferred Units [Member] | Subsequent Event [Member] | Enable Midstream Partners [Member]                        
Subsequent Event [Line Items]                        
Quarterly cash distribution, declaration date             Aug. 02, 2019          
Quarterly cash distribution, date of record             Aug. 02, 2019          
Quarterly cash distribution, distribution date           Aug. 14, 2019            
Quarterly cash distribution declared per share             $ 0.6250          
Expected cash distribution from cost method investment             $ 9