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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2023
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 March 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
| March 31, 2023 |  | December 31, 2022
| Level 1 |  | Level 2 |  | Level 3 |  |  |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  |  | Total
Assets | (in millions)
Equity securities | $ | 548 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 548 |  |  | $ | 510 |  |  | $ | — |  |  | $ | — |  |  |  | $ | 510 |
Investments, including money market funds (1) | 30 |  |  | — |  |  | — |  |  |  |  | 30 |  |  | 32 |  |  | — |  |  | — |  |  |  | 32 |
Interest rate derivatives | — |  |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  |  | 1 |
Natural gas derivatives | — |  |  | 1 |  |  | — |  |  |  |  | 1 |  |  | — |  |  | 11 |  |  | — |  |  |  | 11 |
Total assets | $ | 578 |  |  | $ | 1 |  |  | $ | — |  |  |  |  | $ | 579 |  |  | $ | 542 |  |  | $ | 12 |  |  | $ | — |  |  |  | $ | 554 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indexed debt securities derivative | $ | — |  |  | $ | 617 |  |  | $ | — |  |  |  |  | $ | 617 |  |  | $ | — |  |  | $ | 578 |  |  | $ | — |  |  |  | $ | 578 |
Interest rate derivatives | — |  |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  | — |
Total liabilities | $ | — |  |  | $ | 617 |  |  | $ | — |  |  |  |  | $ | 617 |  |  | $ | — |  |  | $ | 578 |  |  | $ | — |  |  |  | $ | 578 |
Houston Electric
| March 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 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 17 |
Total assets | $ | 15 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 15 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 17 |
CERC
| March 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) | $ | 13 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 13 |  |  | $ | 14 |  |  | $ | — |  |  | $ | — |  |  |  | $ | 14 |
Natural gas derivatives | — |  |  | 1 |  |  | — |  |  |  |  | 1 |  |  | — |  |  | 9 |  |  | — |  |  |  | 9 |
Total assets | $ | 13 |  |  | $ | 1 |  |  | $ | — |  |  |  |  | $ | 14 |  |  | $ | 14 |  |  | $ | 9 |  |  | $ | — |  |  |  | $ | 23 |
(1)Amounts are included in Prepaid expenses and other current assets in the Condensed Consolidated Balance Sheets.
Schedule of Estimated fair value of financial instruments, debt instruments | The fair values of cash and cash equivalents, investments in debt and equity securities measured at fair value 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 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’ Condensed Consolidated Balance Sheets, but for which the fair value is disclosed, would be classified as Level 2 in the fair value hierarchy.
| March 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 | $ | 15,996 |  |  | $ | 7,245 |  |  | $ | 3,937 |  |  | $ | 16,338 |  |  | $ | 6,353 |  |  | $ | 4,826 |
Fair value | 14,965 |  |  | 6,556 |  |  | 3,840 |  |  | 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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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