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Held for Sale and Divestitures (CenterPoint Energy and CERC) - Discontinued Operations Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 01, 2020
Apr. 09, 2020
Feb. 03, 2020
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 02, 2021
Jan. 31, 2021
Oct. 31, 2020
Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Common and preferred units acquired (as a percent)                 100.00%      
Proceeds from divestitures (Note 4)           $ 2,075,000,000 $ 22,000,000 $ 1,215,000,000        
Goodwill impairment       $ 0 $ 0 $ 0 0 185,000,000        
Enable Midstream Partners                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Reduction in quarterly distribution (as a percent)           50.00%            
Enable Midstream Partners | Level 3                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Impairment of CenterPoint Energy’s equity method investment in Enable               1,541,000,000        
Equity method investment, fair value                       $ 848,000,000
CERC Corp                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Proceeds from divestitures (Note 4)           $ 2,075,000,000 $ 22,000,000 365,000,000        
Infrastructure Services Disposal Group                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Sales price of outstanding equity interests     $ 850,000,000                  
Proceeds from divestitures (Note 4)   $ 850,000,000                    
Receivable from sale of disposal group                   $ 4,000,000    
Net deferred tax liabilities on sale recognized as deferred income tax benefit by CenterPoint Energy   $ 129,000,000                    
Current tax expense (benefit) of cash taxes payable upon sale               158,000,000        
Goodwill impairment               82,000,000        
Cost to sell               14,000,000        
Pretax gain (loss)               (6,000,000)        
Maximum contractual exposure under securities purchase agreement           21,000,000            
Infrastructure Services Disposal Group | Level 2                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Fair value of disposal group                       864,000,000
Energy Services Disposal Group                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Sales price of outstanding equity interests           $ 400,000,000            
Proceeds from divestitures (Note 4) $ 286,000,000                      
Receivable from sale of disposal group                     $ 79,000,000  
Net deferred tax liabilities on sale recognized as deferred income tax benefit by CenterPoint Energy 4,000,000                      
Goodwill impairment               62,000,000        
Cost to sell               6,000,000        
Current tax expense of cash taxes payable upon sale               4,000,000        
Loss from reclassification to held for sale               31,000,000        
Energy Services Disposal Group | Level 2                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Fair value of disposal group                       $ 402,000,000
Energy Services Disposal Group | CERC Corp                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Net deferred tax liabilities on sale recognized as deferred income tax benefit by CenterPoint Energy $ 4,000,000                      
Goodwill impairment               62,000,000        
Pretax gain (loss)               3,000,000        
Current tax expense of cash taxes payable upon sale               $ 4,000,000