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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2024
Accounting Policies [Abstract] |
Schedule of LIFO Inventory | The Registrants’ inventory consists principally of materials and supplies, and for CERC, natural gas, and for CenterPoint Energy, coal inventory. Materials and supplies are valued at the lower of average cost or market, are recorded to inventory when purchased and subsequently charged to expense or capitalized to plant when installed. Inventory related to CenterPoint Energy’s regulated operations is valued at historical cost consistent with ratemaking treatment. Coal inventory is valued at average cost. Certain natural gas in storage at CenterPoint Energy’s and CERC’s utilities are recorded using the last in, first out (LIFO) method. CenterPoint Energy’s and CERC’s balances in inventory that were valued using LIFO method were as follows:
|  | Year Ended December 31,
|  | 2024 |  | 2023 (1) |  | 2024 |  | 2023 (1)
|  | CenterPoint Energy |  | CERC
|  | (in millions)
LIFO inventory |  | $ | 94 |  |  | $ | 106 |  |  | $ | 73 |  |  | $ | 86 |
(1)Based on the average cost of gas purchased during December 2024, CenterPoint Energy’s cost of replacing inventories carried at LIFO cost was $1 million less than the carrying value at December 31, 2024. CERC’s cost of replacing inventories carried at LIFO cost was $4 million more than the carrying value at December 31, 2024.
Schedule of Public Utilities General Disclosures | The Registrants capitalize interest and AFUDC as a component of projects under construction and amortize it over the assets’ estimated useful lives once the assets are placed in service. Additionally, the Registrants defer interest costs into a regulatory asset when amounts are probable of recovery. Deferred debt interest is amortized over the recovery period for rate-making purposes. AFUDC represents the composite interest cost of borrowed funds and a reasonable return on the equity funds used for construction for subsidiaries that apply the guidance for accounting for regulated operations. Although AFUDC increases both property, plant and equipment and earnings, it is realized in cash when the assets are included in rates. The table below includes interest capitalized or deferred for the periods presented:
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
| CenterPoint Energy |  | Houston Electric |  | CERC |  | CenterPoint Energy |  | Houston Electric |  | CERC |  | CenterPoint Energy |  | Houston Electric |  | CERC
| (in millions)
Capitalized interest and AFUDC debt (1) | $ | 33 |  |  | $ | 18 |  |  | $ | 8 |  |  | $ | 32 |  |  | $ | 18 |  |  | $ | 6 |  |  | $ | 26 |  |  | $ | 14 |  |  | $ | 7 |
AFUDC equity (2) | 66 |  |  | 33 |  |  | 17 |  |  | 62 |  |  | 32 |  |  | 14 |  |  | 37 |  |  | 24 |  |  | 5 |
Deferred debt interest (3) | 65 |  |  | 24 |  |  | 36 |  |  | 65 |  |  | 16 |  |  | 43 |  |  | 51 |  |  | 12 |  |  | 36 |
(1)Included in Interest expense and other finance charges on the Registrants’ respective Statements of Consolidated Income. (2)Included in Other income (expense), net on the Registrants’ respective Statements of Consolidated Income. (3)Represents the amount on certain regulatory assets that are authorized to earn a return, such as debt post in-service carrying costs on property, plant and equipment, gas costs, storm restoration costs, and TEEEF (including returns on both regulatory and lease assets) and is included in Interest expense and other finance charges on the Registrants’ respective Statements of Consolidated Income.

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- Definition Tabular disclosure of regulation for public utility entities, including, but not limited to, rate requests, decommissioning costs and the amount of allowance for earnings on equity capitalized for rate making purposes. + References No definition available. + Details
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- Definition Tabular disclosure of inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle including inventoried costs relating to long-term contracts or programs. + References No definition available. + Details
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