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Unconsolidated Affiliate (CenterPoint Energy and CERC) - Schedule of Interests, Distributions, and Transactions with Enable (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]          
Distributions from unconsolidated affiliates     $ 77 $ 109  
Total distributions received from Enable $ 47 $ 48 95 134  
Enable Midstream Partners          
Schedule of Equity Method Investments [Line Items]          
Accounts receivable for amounts billed for services provided to Enable 1   1   $ 1
Natural Gas Expenses | Enable Midstream Partners          
Schedule of Equity Method Investments [Line Items]          
Natural gas expenses, including transportation and storage costs 16 $ 17 48 $ 44  
Accounts payable for natural gas purchases from Enable $ 5   $ 5   9
Enable Midstream Partners          
Schedule of Equity Method Investments [Line Items]          
Maximum incentive distribution right     50.00%    
Incentive distribution     $ 0    
Enable Midstream Partners | Common Stock          
Schedule of Equity Method Investments [Line Items]          
Distribution per share of common units (in dollars per share) $ 0.16525 $ 0.16525 $ 0.33050 $ 0.49575  
Distributions from unconsolidated affiliates $ 38 $ 39 $ 77 $ 116  
Enable Midstream Partners | Preferred Stock          
Schedule of Equity Method Investments [Line Items]          
Distribution per share of Series A preferred units (in dollars per share) $ 0.58730 $ 0.62500 $ 1.21230 $ 1.25000  
Distributions received from Enable cost method investment $ 9 $ 9 $ 18 $ 18  
Maximum | Enable Midstream Partners          
Schedule of Equity Method Investments [Line Items]          
Incentive distribution per unit (in dollars per unit)     $ 0.330625    
CERC Corp | Enable Midstream Partners          
Schedule of Equity Method Investments [Line Items]          
Accounts receivable for amounts billed for services provided to Enable 1   $ 1   1
CERC Corp | Natural Gas Expenses | Enable Midstream Partners          
Schedule of Equity Method Investments [Line Items]          
Natural gas expenses, including transportation and storage costs 16 $ 17 48 $ 44  
Accounts payable for natural gas purchases from Enable $ 5   $ 5   $ 9
Enable GP, LLC | CenterPoint Energy          
Schedule of Equity Method Investments [Line Items]          
Management rights ownership (as a percent)     50.00%    
Incentive distribution rights (as a percent)     40.00%    
Enable GP, LLC | OGE          
Schedule of Equity Method Investments [Line Items]          
Management rights ownership (as a percent)     50.00%    
Incentive distribution rights (as a percent)     60.00%