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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2022
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:
June 30, 2022December 31, 2021
Hedging ClassificationNotional 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
June 30, 2022December 31, 2021
Balance Sheet LocationDerivative
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$26 $— $9 $— 
Natural gas derivatives (1)
Other Assets: Non-trading derivative assets6 — 5 — 
Interest rate derivativesCurrent Liabilities: Non-trading derivative liabilities— — — 2 
Interest rate derivativesOther Liabilities: Non-trading derivative liabilities— — — 12 
Indexed debt securities derivative (2)
Current Liabilities— 732 — 903 
Total$32 $732 $14 $917 

CERC
June 30, 2022December 31, 2021
Balance Sheet LocationDerivative
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$21 $— $8 $— 
Natural gas derivatives (1)
Other Assets: Non-trading derivative assets5 — 4 — 
Total$26 $— $12 $— 

(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
June 30,		Six Months Ended
June 30,
Income Statement Location2022202120222021
Derivatives not designated as hedging instruments:(in millions)
Indexed debt securities derivative (1)
Gain (loss) on indexed debt securities$65 $(77)$171 $(51)

(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.
Schedule of Credit-risk-related Contingent Features
June 30,
2022 (1)
December 31, 2021
(in millions)
Aggregate fair value of derivatives with credit risk-related contingent features in a liability position$— $14 
Fair value of collateral already posted— 7 
Additional collateral required to be posted if credit risk contingent features triggered (2)
— 7 

(1)As of June 30, 2022, all derivatives with credit risk-related contingent features were in an asset position.
(2)The maximum collateral required if further escalating collateral is triggered would equal the net liability position.