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Related Party Transactions (Houston Electric and CERC) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Related Party Transaction [Line Items]          
Total Assets $ 36,216   $ 36,216   $ 37,679
Retained earnings 768   768   154
Total shareholders’ equity 10,023 $ 8,870 10,023 $ 8,870 9,415
Net income 190 251 721 614  
Houston Electric          
Related Party Transaction [Line Items]          
Cash dividends paid to parent 30 0 67 0  
Cash dividend paid to parent related to the sale of the Arkansas and Oklahoma Natural Gas businesses 0 0 0 0  
Cash contribution from parent 506 0 1,143 0  
Net assets acquired in the Restructuring 0 0 0 0  
Non-cash capital contribution from parent in payment for property, plant and equipment below 0 0 38 0  
Cash paid to parent for property, plant and equipment below 13 0 65 0  
Property, plant and equipment from parent 13 0 103 0  
Total Assets 14,306   14,306   12,980
Retained earnings 1,085   1,085   944
Total shareholders’ equity 4,945 3,267 4,945 3,267 3,622
Net income 147 103 208 156  
Houston Electric | Operation and maintenance expense          
Related Party Transaction [Line Items]          
Net affiliate service charges (billings) (9) (1) (15) (2)  
Houston Electric | CenterPoint Energy | Operation and maintenance expense          
Related Party Transaction [Line Items]          
Corporate service charges 37 47 76 90  
CERC          
Related Party Transaction [Line Items]          
Cash dividends paid to parent 72 0 111 0  
Cash dividend paid to parent related to the sale of the Arkansas and Oklahoma Natural Gas businesses 0 0 720 0  
Cash contribution from parent 125 0 125 0  
Net assets acquired in the Restructuring 2,345 0 2,345 0  
Non-cash capital contribution from parent in payment for property, plant and equipment below 0 0 54 0  
Cash paid to parent for property, plant and equipment below 13 0 61 0  
Property, plant and equipment from parent 13 0 115 0  
Total Assets 14,278   14,278   16,153
Liabilities         11,020
Retained earnings 1,569   1,569   1,017
Total shareholders’ equity 5,144 4,914 5,144 4,914 5,133
Net income 27 73 663 295  
CERC | Previously Reported          
Related Party Transaction [Line Items]          
Total Assets         11,110
Liabilities         8,109
Retained earnings         765
Total shareholders’ equity         3,001
Net income   58   209  
CERC | Operation and maintenance expense          
Related Party Transaction [Line Items]          
Net affiliate service charges (billings) 9 1 15 2  
CERC | CenterPoint Energy | Operation and maintenance expense          
Related Party Transaction [Line Items]          
Corporate service charges $ 51 $ 58 $ 109 $ 114  
IGC and VEDO          
Related Party Transaction [Line Items]          
Notes Payable, Related Parties         $ 217
Weighted average interest rate of debt (as a percent)         0.21%
Investments | Houston Electric          
Related Party Transaction [Line Items]          
Money pool weighted average interest rate (as a percent) 1.85%   1.85%   0.34%
Investments | CERC          
Related Party Transaction [Line Items]          
Money pool weighted average interest rate (as a percent) 1.85%   1.85%   0.34%
Accounts and notes receivable (payable) - affiliate companies | Houston Electric          
Related Party Transaction [Line Items]          
Money pool investments (borrowings) $ 272   $ 272   $ (512)
Accounts and notes receivable (payable) - affiliate companies | CERC          
Related Party Transaction [Line Items]          
Money pool investments (borrowings) $ 0   $ 0   $ (224)