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Reportable Segments - Schedule of Revenues by Products and Services (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total	$ 8,643	$ 8,696	$ 9,321
CenterPoint Energy
Segment Reporting Information [Line Items]
Total	8,643	8,696	9,321
CenterPoint Energy | Electric delivery
Segment Reporting Information [Line Items]
Total	3,963	3,701	3,438
CenterPoint Energy | Retail electric sales
Segment Reporting Information [Line Items]
Total	622	569	630
CenterPoint Energy | Wholesale electric sales
Segment Reporting Information [Line Items]
Total	4	20	40
CenterPoint Energy | Retail gas sales
Segment Reporting Information [Line Items]
Total	3,837	4,078	4,759
CenterPoint Energy | Gas transportation
Segment Reporting Information [Line Items]
Total	11	11	12
CenterPoint Energy | Energy products and services
Segment Reporting Information [Line Items]
Total	206	317	442
Houston Electric
Segment Reporting Information [Line Items]
Total	3,939	3,677	3,412
Houston Electric | Electric delivery
Segment Reporting Information [Line Items]
Total	3,939	3,677	3,412
Houston Electric | Retail electric sales
Segment Reporting Information [Line Items]
Total	0	0	0
Houston Electric | Wholesale electric sales
Segment Reporting Information [Line Items]
Total	0	0	0
Houston Electric | Retail gas sales
Segment Reporting Information [Line Items]
Total	0	0	0
Houston Electric | Gas transportation
Segment Reporting Information [Line Items]
Total	0	0	0
Houston Electric | Energy products and services
Segment Reporting Information [Line Items]
Total	0	0	0
CERC
Segment Reporting Information [Line Items]
Total	3,925	4,149	4,800
CERC | Electric delivery
Segment Reporting Information [Line Items]
Total	0	0	0
CERC | Retail electric sales
Segment Reporting Information [Line Items]
Total	0	0	0
CERC | Wholesale electric sales
Segment Reporting Information [Line Items]
Total	0	0	0
CERC | Retail gas sales
Segment Reporting Information [Line Items]
Total	3,716	3,951	4,613
CERC | Gas transportation
Segment Reporting Information [Line Items]
Total	11	11	12
CERC | Energy products and services
Segment Reporting Information [Line Items]
Total	$ 198	$ 187	$ 175

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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