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Divestitures (CenterPoint Energy and CERC) - Divestitures Narrative (Details) mi in Thousands, $ in Millions		3 Months Ended		12 Months Ended
	Apr. 29, 2021 USD ($) mi	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	May 31, 2022 USD ($)
Discontinued Operation, Additional Disclosures [Abstract]
Proceeds from divestitures		$ 0	$ 2,060
Miles of pipeline (in miles) | mi	17
Gain on sale		0	303
Transition services agreement charges		1	9
Transition services agreement, accounts receivable		1		$ 1
CERC
Discontinued Operation, Additional Disclosures [Abstract]
Proceeds from divestitures		0	2,060
Gain on sale		$ 0	$ 557
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Arkansas and Oklahoma Natural Gas Businesses
Discontinued Operation, Additional Disclosures [Abstract]
Proceeds from divestitures	$ 2,150
Recovery of costs	$ 425
Gain on sale				303
Transaction costs				59
Receivables, net					$ 15
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Arkansas and Oklahoma Natural Gas Businesses | CERC
Discontinued Operation, Additional Disclosures [Abstract]
Gain on sale				557
Transaction costs				$ 59
Receivables, net					$ 15

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