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Reportable Segments - Revenues by Products and Services (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Operating revenues | $ 8,696 | $ 9,321 | $ 8,352
CenterPoint Energy |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 8,696 | 9,321 | 8,352
CenterPoint Energy | Electric delivery |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 3,701 | 3,438 | 3,158
CenterPoint Energy | Retail electric sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 569 | 630 | 559
CenterPoint Energy | Wholesale electric sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 20 | 40 | 46
CenterPoint Energy | Retail gas sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 4,078 | 4,759 | 4,157
CenterPoint Energy | Gas transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 11 | 12 | 12
CenterPoint Energy | Energy products and services |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 317 | 442 | 420
Houston Electric |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 3,677 | 3,412 | 3,134
Houston Electric | Electric delivery |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 3,677 | 3,412 | 3,134
Houston Electric | Retail electric sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 | 0
Houston Electric | Wholesale electric sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 | 0
Houston Electric | Retail gas sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 | 0
Houston Electric | Gas transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 | 0
Houston Electric | Energy products and services |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 | 0
CERC Corp |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 4,149 | 4,800 | 4,200
CERC Corp | Electric delivery |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 | 0
CERC Corp | Retail electric sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 | 0
CERC Corp | Wholesale electric sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 | 0
CERC Corp | Retail gas sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 3,951 | 4,613 | 4,021
CERC Corp | Gas transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 11 | 12 | 12
CERC Corp | Energy products and services |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | $ 187 | $ 175 | $ 167

X
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