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Subsequent Events (CenterPoint Energy) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Dec. 12, 2019
Dec. 02, 2019
Nov. 26, 2019
Nov. 21, 2019
Nov. 19, 2019
Nov. 15, 2019
Nov. 14, 2019
Nov. 05, 2019
Oct. 17, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Subsequent Event [Line Items]                          
Dividends declared per share                   $ 0.2875 $ 0.2775 $ 0.5750 $ 0.5550
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]                          
Preferred stock dividends declared                   30.6250 0.0000 30.6250 0.0000
Series B Preferred Stock [Member]                          
Subsequent Event [Line Items]                          
Preferred stock dividends declared                   $ 17.5000 $ 0.0000 $ 35.0000 $ 0.0000
Subsequent Event [Member] | Common Stock [Member]                          
Subsequent Event [Line Items]                          
Dividends payable, date declared                 Oct. 17, 2019        
Dividends payable, date of record       Nov. 21, 2019                  
Dividends payable, date to be paid Dec. 12, 2019                        
Dividends declared per share                 $ 0.2875        
Subsequent Event [Member] | Series B Preferred Stock [Member]                          
Subsequent Event [Line Items]                          
Dividends payable, date declared                 Oct. 17, 2019        
Dividends payable, date of record           Nov. 15, 2019              
Dividends payable, date to be paid   Dec. 02, 2019                      
Preferred stock dividends declared                 $ 17.5000        
Common Units [Member] | Subsequent Event [Member] | Enable Midstream Partners [Member]                          
Subsequent Event [Line Items]                          
Quarterly cash distribution, declaration date               Nov. 05, 2019          
Quarterly cash distribution, date of record         Nov. 19, 2019                
Quarterly cash distribution, distribution date     Nov. 26, 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               Nov. 05, 2019          
Quarterly cash distribution, date of record               Nov. 05, 2019          
Quarterly cash distribution, distribution date             Nov. 14, 2019            
Quarterly cash distribution declared per share               $ 0.6250          
Expected cash distribution from cost method investment               $ 9