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Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions | The table below summarizes CenterPoint Energy’s outstanding interest rate hedging activity:
|  | March 31, 2023 |  |  |  | December 31, 2022
Hedging Classification |  | Notional Principal
|  | (in millions)
Economic hedge (1) |  | $ | 84 |  |  |  |  | $ | 84 |  |  |
(1)Relates to interest rate derivative instruments at SIGECO. On June 13, 2022, SIGECO amended the LIBOR interest rate swaps to adjust the termination date to May 1, 2023.
Schedule of Fair Value of Derivative Instruments | The following tables present information about derivative instruments and hedging activities. The first table provides a balance sheet overview of derivative assets and liabilities, while the last table provides a breakdown of the related income statement impacts. Fair Value of Derivative Instruments and Hedged Items CenterPoint Energy
|  |  |  | March 31, 2023 |  | December 31, 2022
|  | Balance Sheet Location |  | Derivative Assets Fair Value |  | Derivative Liabilities Fair Value |  | Derivative Assets Fair Value |  | Derivative Liabilities Fair Value
| Derivatives not designated as hedging instruments: |  | (in millions)
| Natural gas derivatives (1) | Current Assets: Non-trading derivative assets |  | $ | 1 |  |  | $ | — |  |  | $ | 9 |  |  | $ | — |
| Natural gas derivatives (1) | Other Assets: Non-trading derivative assets |  | — |  |  | — |  |  | 2 |  |  | — |
| Interest rate derivatives | Current Assets: Non-trading derivative assets |  | — |  |  | — |  |  | 1 |  |  | — |
| Indexed debt securities derivative (2) | Current Liabilities |  | — |  |  | 617 |  |  | — |  |  | 578 |
| Total |  | $ | 1 |  |  | $ | 617 |  |  | $ | 12 |  |  | $ | 578 |
CERC
|  |  |  | March 31, 2023 |  | December 31, 2022
|  | Balance Sheet Location |  | Derivative Assets Fair Value |  | Derivative Liabilities Fair Value |  | Derivative Assets Fair Value |  | Derivative Liabilities Fair Value
| Derivatives not designated as hedging instruments: |  | (in millions)
| Natural gas derivatives (1) | Current Assets: Non-trading derivative assets |  | $ | 1 |  |  | $ | — |  |  | $ | 7 |  |  | $ | — |
| Natural gas derivatives (1) | Other Assets: Non-trading derivative assets |  | — |  |  | — |  |  | 2 |  |  | — |
| Total |  | $ | 1 |  |  | $ | — |  |  | $ | 9 |  |  | $ | — |
(1)Natural gas contracts are subject to master netting arrangements. This netting applies to all undisputed amounts due or past due. However, the mark-to-market fair value of each natural gas contract is in an asset position with no offsetting amounts. (2)Derivative component of the ZENS obligation that represents the ZENS holder’s option to receive the appreciated value of the reference shares at maturity. See Note 10 for further information.
Schedule of Income Statement Impact of Derivative Activity | Income Statement Impact of Hedge Accounting Activity (CenterPoint Energy)
|  |  |  |  |  | Three Months Ended March 31,
|  | Income Statement Location |  |  |  |  |  | 2023 |  | 2022
Derivatives not designated as hedging instruments: |  |  |  |  |  |  | (in millions)
Indexed debt securities derivative (1) |  | Gain (loss) on indexed debt securities |  |  |  |  |  | $ | (39) |  |  | $ | 106 |
(1)The indexed debt securities derivative is recorded at fair value and changes in the fair value are recorded in CenterPoint Energy’s Condensed Statements of Consolidated Income.

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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