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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on a Recurring Basis
The following tables present information about the Registrants’ assets and liabilities (including derivatives that are presented net) measured at fair value on a recurring basis as of December 31, 2022 and December 31, 2021, and indicate the fair value hierarchy of the valuation techniques utilized by the Registrants to determine such fair value.

CenterPoint Energy
December 31, 2022December 31, 2021

Level 1		Level 2Level 3Total
Level 1		Level 2Level 3Total
Assets(in millions)
Equity securities $510 $— $— $510 $1,439 $— $— $1,439 
Investments, including money market funds (1)
32 — — 32 42 — — 42 
Interest rate derivatives
— 1 — 1 — — — — 
Natural gas derivatives— 11 — 11 — 14 — 14 
Total assets$542 $12 $— $554 $1,481 $14 $— $1,495 
Liabilities    
Indexed debt securities derivative
$— $578 $— $578 $— $903 $— $903 
Interest rate derivatives
— — — — — 14 — 14 
Total liabilities$— $578 $— $578 $— $917 $— $917 
Houston Electric
December 31, 2022December 31, 2021

Level 1		Level 2Level 3Total
Level 1		Level 2Level 3Total
Assets(in millions)
Investments, including money market funds (1)
$17 $— $— $17 $27 $— $— $27 
Total assets$17 $— $— $17 $27 $— $— $27 

CERC
December 31, 2022December 31, 2021

Level 1		Level 2Level 3Total
Level 1		Level 2Level 3Total
Assets(in millions)
Investments, including money market funds (1)
$14 $— $— $14 $14 $— $— $14 
Natural gas derivatives — 9 — 9 — 12 — 12 
Total assets$14 $9 $— $23 $14 $12 $— $26 

(1)Amounts are included in Prepaid and Other Current Assets in the respective Consolidated Balance Sheets.
Estimated Fair Value of Financial Instruments, Debt Instruments
The fair values of cash and cash equivalents, investments in debt and equity securities classified as “trading” and short-term borrowings 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 equity securities, including ZENS related derivative liabilities, 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, 2022December 31, 2021
 
CenterPoint Energy (1)
Houston Electric (1)
CERC
CenterPoint Energy (1)
Houston Electric (1)
CERC
Long-term debt, including current maturities
(in millions)
Carrying amount
$16,338 $6,353 $4,826 $16,086 $5,495 $5,552 
Fair value
14,990 5,504 4,637 17,385 6,230 5,999 

(1)Includes Securitization Bond debt.