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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
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, 2023 and December 31, 2022, and indicate the fair value hierarchy of the valuation techniques utilized by the Registrants to determine such fair value. CenterPoint Energy
| December 31, 2023 |  | December 31, 2022
| Level 1 |  | Level 2 |  | Level 3 |  |  |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  |  |  | Total
Assets | (in millions)
Equity securities | $ | 541 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 541 |  |  | $ | 510 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 510 |
Investments, including money market funds (1) | 31 |  |  | — |  |  | — |  |  |  |  | 31 |  |  | 32 |  |  | — |  |  | — |  |  |  |  | 32 |
Interest rate derivatives | — |  |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  |  |  | 1 |
Natural gas derivatives | — |  |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  | 11 |  |  | — |  |  |  |  | 11 |
Total assets | $ | 572 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 572 |  |  | $ | 542 |  |  | $ | 12 |  |  | $ | — |  |  |  |  | $ | 554 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indexed debt securities derivative | $ | — |  |  | $ | 605 |  |  | $ | — |  |  |  |  | $ | 605 |  |  | $ | — |  |  | $ | 578 |  |  | $ | — |  |  |  |  | $ | 578 |
Natural gas derivatives | — |  |  | 12 |  |  | — |  |  |  |  | 12 |  |  | — |  |  | — |  |  | — |  |  |  |  | — |
Total liabilities | $ | — |  |  | $ | 617 |  |  | $ | — |  |  |  |  | $ | 617 |  |  | $ | — |  |  | $ | 578 |  |  | $ | — |  |  |  |  | $ | 578 |
Houston Electric
| December 31, 2023 |  | December 31, 2022
| Level 1 |  | Level 2 |  | Level 3 |  |  |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  |  |  | Total
Assets | (in millions)
Investments, including money market funds (1) | $ | 14 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 14 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 17 |
Total assets | $ | 14 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 14 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 17 |
CERC
| December 31, 2023 |  | December 31, 2022
| Level 1 |  | Level 2 |  | Level 3 |  |  |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  |  |  | Total
Assets | (in millions)
Investments, including money market funds (1) | $ | 15 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 15 |  |  | $ | 14 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 14 |
Natural gas derivatives | — |  |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  | 9 |  |  | — |  |  |  |  | 9 |
Total assets | $ | 15 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 15 |  |  | $ | 14 |  |  | $ | 9 |  |  | $ | — |  |  |  |  | $ | 23 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas derivatives | $ | — |  |  | $ | 11 |  |  | $ | — |  |  |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |
Total liabilities | $ | — |  |  | $ | 11 |  |  | $ | — |  |  |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |
(1)Amounts are included in Prepaid expenses 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, 2023 |  | December 31, 2022
| CenterPoint Energy (1) |  | Houston Electric (1) |  | CERC |  | CenterPoint Energy (1) |  | Houston Electric (1) |  | CERC
Long-term debt, including current maturities | (in millions)
Carrying amount | $ | 18,609 |  |  | $ | 7,587 |  |  | $ | 4,670 |  |  | $ | 16,338 |  |  | $ | 6,353 |  |  | $ | 4,826 |
Fair value | 17,804 |  |  | 6,917 |  |  | 4,627 |  |  | 14,990 |  |  | 5,504 |  |  | 4,637 |
(1)Includes Securitization Bond debt.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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