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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
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,
20242023 (1)20242023 (1)
CenterPoint EnergyCERC
(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,
 202420232022
 CenterPoint Energy Houston ElectricCERC CenterPoint Energy Houston ElectricCERC CenterPoint Energy Houston ElectricCERC
 (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.