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Held for Sale and Divestitures (CenterPoint Energy and CERC) - Narrative (Details) - Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations numberOfCustomer in Thousands, mi in Thousands, $ in Millions		12 Months Ended
	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Feb. 19, 2024 USD ($) numberOfCustomer mi	May 21, 2023 USD ($)
Energy Systems Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity purchase agreement, purchase price					$ 157
Proceeds from divestitures	$ 154
Adjustments on working capital			$ 2
Loss (gain) on divestitures		$ 13
Transaction costs		3
Current tax expense of divestiture		$ 32
Louisiana and Mississippi Regulated Natural Gas LDC Businesses | CERC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price				$ 1,200
Miles of pipeline (in miles) | mi				12
Number of customers (more than) | numberOfCustomer				300

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Amount classified as accounts payable attributable to disposal group held for sale or disposed of.

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