Held for Sale and Divestitures (CenterPoint Energy and CERC) - Schedule of Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets held for sale	$ 1,361	$ 0
Total current liabilities held for sale	176	0
CERC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets held for sale	1,266	0
Total current liabilities held for sale	176	$ 0
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana And Mississippi Natural Gas LDC Businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accrued unbilled revenues	26
Materials and supplies	13
Natural gas inventory	5
Property, plant and equipment, net	1,052
Goodwill	217
Regulatory assets	15
Other	6
Total current assets held for sale	1,361
Short-term borrowings	3
Accounts payable	44
Customer deposits	14
Regulatory liabilities	31
Other	84
Total current liabilities held for sale	176
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana And Mississippi Natural Gas LDC Businesses | CERC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accrued unbilled revenues	26
Materials and supplies	13
Natural gas inventory	5
Property, plant and equipment, net	1,052
Goodwill	122
Regulatory assets	15
Other	6
Total current assets held for sale	1,266
Short-term borrowings	3
Accounts payable	44
Customer deposits	14
Regulatory liabilities	31
Other	84
Total current liabilities held for sale	176
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana and Mississippi Regulated Natural Gas LDC Businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable, net	27
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana and Mississippi Regulated Natural Gas LDC Businesses | CERC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable, net	$ 27