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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets Measured on a Recurring Basis
The following tables present information about the Registrants’ assets and liabilities measured at fair value on a recurring basis as of December 31, 2024 and December 31, 2023 and indicate the fair value hierarchy of the valuation techniques utilized by the Registrants to determine such fair value:
CenterPoint Energy
December 31, 2024December 31, 2023

Level 1		Level 2Level 3Total
Level 1		Level 2Level 3Total
Assets(in millions)
Equity securities $561 $— $— $561 $541 $— $— $541 
Investments, including money market funds (1)22 — — 22 31 — — 31 
Natural gas derivatives (1)
— 1 — 1 — — — — 
Total assets$583 $1 $— $584 $572 $— $— $572 
Liabilities    
Indexed debt securities derivative$— $619 $— $619 $— $605 $— $605 
Natural gas derivatives (2)
— 3 — 3 — 12 — 12 
Total liabilities$— $622 $— $622 $— $617 $— $617 

Houston Electric
December 31, 2024December 31, 2023
Level 1
Level 2Level 3Total
Level 1
Level 2Level 3Total
Assets(in millions)
Investments, including money market funds (1)$5 $— $— $5 $14 $— $— $14 
Total assets$5 $— $— $5 $14 $— $— $14 

CERC
December 31, 2024December 31, 2023
Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Assets(in millions)
Investments, including money market funds (1)$15 $— $— $15 $15 $— $— $15 
Natural gas derivatives (1)
— 1 — 1 — — — — 
Total assets$15 $1 $— $16 $15 $— $— $15 
Liabilities    
Natural gas derivatives (2)
$— $2 $— $2 $— $11 $— $11 
Total liabilities$— $2 $— $2 $— $11 $— $11 

(1)Included in Prepaid expenses and other current assets in the respective Consolidated Balance Sheets.
(2)Included in Other current liabilities in the respective Consolidated Balance Sheets.
Schedule of Estimated Fair Value of Financial Instruments, Debt Instruments
The fair values of cash and cash equivalents, investments in equity securities measured at fair value and short-term borrowings under AMAs are estimated to be approximately equivalent to carrying amounts and have been excluded from the table below. The carrying amounts of non-trading derivative assets and liabilities and CenterPoint Energy’s ZENS indexed debt securities derivative are stated at fair value and are excluded from the table below. The fair value of each debt instrument is determined by multiplying the principal amount of each debt instrument by a combination of historical trading prices and
comparable issue data. These liabilities, which are not measured at fair value in the Registrants’ Consolidated Balance Sheets, but for which the fair value is disclosed, would be classified as Level 2 in the fair value hierarchy.
 December 31, 2024December 31, 2023
 CenterPoint Energy (1)Houston Electric (1)CERCCenterPoint Energy (1)Houston Electric (1)CERC
Long-term debt, including current maturities(in millions)
Carrying amount$20,961 $8,822 $5,184 $18,609 $7,587 $4,670 
Fair value19,597 7,746 5,032 17,804 6,917 4,627 

(1)Includes Securitization Bonds, as applicable.