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v3.24.1.u1

Short-term Borrowings and Long-term Debt - Schedule of Utilization of Credit Facilities (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
CERC |  |
Debt Instrument [Line Items] |  |
Number of days until commercial paper maturity (in days) | 30 days |
Loans |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | $ 0 | $ 0
Loans | CenterPoint Energy |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | 0 | 0
Loans | SIGECO |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | 0 | 0
Loans | Houston Electric |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | 0 | 0
Loans | CERC |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | 0 | 0
Letters of Credit |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | 1 | 1
Letters of Credit | CenterPoint Energy |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | 0 | 0
Letters of Credit | SIGECO |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | 0 | 0
Letters of Credit | Houston Electric |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | 0 | 0
Letters of Credit | CERC |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | 1 | 1
Commercial Paper |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | 1,677 | 1,520
Commercial Paper | CenterPoint Energy |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | $ 1,145 | $ 1,036
Weighted Average Interest Rate | 5.49% | 5.54%
Number of days until commercial paper maturity (in days) | 60 days |
Commercial Paper | SIGECO |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | $ 0 | $ 0
Weighted Average Interest Rate | 0.00% | 0.00%
Commercial Paper | Houston Electric |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | $ 0 | $ 0
Weighted Average Interest Rate | 0.00% | 0.00%
Commercial Paper | CERC |  |
Debt Instrument [Line Items] |  |
Long-term line of credit | $ 532 | $ 484
Weighted Average Interest Rate | 5.47% | 5.53%

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