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v3.23.3

Derivative Instruments - Narrative (Details) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) Agreement | Aug. 31, 2023 USD ($) | Oct. 31, 2023 USD ($) | Jun. 30, 2023 USD ($)
CenterPoint Energy |  |  |  |
Derivative [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 400 |  |
CenterPoint Energy | 3-Year Rate |  |  |  |
Derivative [Line Items] |  |  |  |
Forward interest rate derivative notional amount |  |  |  | $ 75
U.S. treasury rate term (in years) |  | 3 years |  |
SIGECO |  |  |  |
Derivative [Line Items] |  |  |  |
Number of instruments held | Agreement | 2 |  |  |
SIGECO | 5-Year Rate |  |  |  |
Derivative [Line Items] |  |  |  |
Forward interest rate derivative notional amount | $ 50 |  |  |
U.S. treasury rate term (in years) | 5 years |  |  |
SIGECO | 7-Year Rate |  |  |  |
Derivative [Line Items] |  |  |  |
Forward interest rate derivative notional amount | $ 38 |  |  |
U.S. treasury rate term (in years) | 7 years |  |  |
SIGECO | Subsequent Event |  |  |  |
Derivative [Line Items] |  |  |  |
Debt instrument, face amount |  |  | $ 470 |

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