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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2026
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities 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 the dates presented and indicate the fair value hierarchy of the valuation techniques utilized by the Registrants to determine such fair value:

CenterPoint Energy
March 31, 2026December 31, 2025
Level 1
Level 2Level 3Total
Level 1
Level 2Level 3Total
Assets(in millions)
Investment in equity securities$555 $— $— $555 $510 $— $— $510 
Investments, including money market funds (1) (3)
28 — — 28 23 — — 23 
Total assets$583 $— $— $583 $533 $— $— $533 
Liabilities    
Indexed debt securities derivative$— $606 $— $606 $— $564 $— $564 
Total liabilities$— $606 $— $606 $— $564 $— $564 

Houston Electric
March 31, 2026December 31, 2025
Level 1
Level 2Level 3Total
Level 1
Level 2Level 3Total
Assets(in millions)
Investments, including money market funds (2) (3)
$11 $— $— $11 $6 $— $— $6 
Total assets$11 $— $— $11 $6 $— $— $6 
CERC
March 31, 2026December 31, 2025
Level 1
Level 2Level 3Total
Level 1
Level 2Level 3Total
Assets(in millions)
Investments, including money market funds (1)$16 $— $— $16 $16 $— $— $16 
Total assets$16 $— $— $16 $16 $— $— $16 
(1)Primarily included in Other non-current assets in the respective Condensed Consolidated Balance Sheets.
(2)Primarily included in Prepaid expenses and other current assets in the Condensed Consolidated Balance Sheets.
(3)Includes amounts associated with capital contributions made to the Bond Companies.
Schedule of Estimated Fair Value of Financial Instruments, Debt Instruments
 March 31, 2026December 31, 2025
CenterPoint Energy (1)
Houston Electric (1)
CERCCenterPoint Energy (1)
Houston Electric (1)
CERC
Short-term borrowings and long-term debt, including current maturities
(in millions)
Carrying amount$24,683 $11,557 $4,716 $22,980 $10,079 $4,717 
Fair value23,968 10,606 4,697 22,377 9,292 4,711 
(1)Includes Securitization Bonds.