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Short-term Borrowings and Long-term Debt - Schedule of Debt (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) day | Dec. 31, 2023 USD ($)
Long-term debt: |  |
Unamortized debt issuance costs | $ (48) | $ (35)
Unamortized discount and premium, net | (6) | (5)
Long-term debt | 20,397 | 17,559
Current debt | 566 | 1,059
Short-term borrowings | $ 500 | 4
Number of days until commercial paper maturity | day | 60 |
CenterPoint Energy |  |
Long-term debt: |  |
Number of days until commercial paper maturity | day | 60 |
Houston Electric |  |
Long-term debt: |  |
Unamortized debt issuance costs | $ (62) | (59)
Unamortized discount and premium, net | (29) | (28)
Long-term debt | 8,322 | 7,426
Current debt | 500 | 161
Short-term borrowings | 500 | 0
Houston Electric | Term loan |  |
Long-term debt: |  |
Short-term borrowings | 500 | 0
CERC |  |
Long-term debt: |  |
Unamortized debt issuance costs | (31) | (31)
Unamortized discount and premium, net | 0 | 1
Long-term debt | 5,174 | 4,670
Current debt | 10 | 4
Short-term borrowings | $ 0 | 4
Number of days until commercial paper maturity | day | 30 |
CERC | Inventory Financing |  |
Long-term debt: |  |
Short-term borrowings | $ 0 | 4
ZENS debt, due 2029 |  |
Long-term debt: |  |
Long-Term | 0 | 0
Current | 2 | 5
CenterPoint Energy senior notes 1.45% to 5.25% due 2026 to 2049 |  |
Long-term debt: |  |
Long-Term | 3,950 | 3,250
Current | 0 | 850
CenterPoint Energy junior subordinated notes 6.70% to 7.00% due 2055 |  |
Long-term debt: |  |
Long-Term | 1,300 | 0
Current | 0 | 0
CenterPoint Energy pollution control bonds 5.125% due 2028 |  |
Long-term debt: |  |
Long-Term | 68 | 68
Current | $ 0 | 0
CenterPoint Energy pollution control bonds 5.125% due 2028 | CenterPoint Energy |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.125% |
CenterPoint Energy commercial paper |  |
Long-term debt: |  |
Long-Term | $ 382 | 1,036
Current | 0 | 0
CenterPoint Energy commercial paper | CERC |  |
Long-term debt: |  |
Long-Term | 599 | 484
SIGECO first mortgage bonds 3.450% to 6.00% due 2024 to 2055 | SIGECO |  |
Long-term debt: |  |
Long-Term | 944 | 825
Current | 41 | 22
SIGECO securitization bonds 5.026% to 5.172% due 2036 to 2041 | SIGECO |  |
Long-term debt: |  |
Long-Term | 311 | 324
Current | 13 | 17
CERC Debt | CERC |  |
Long-term debt: |  |
Long-term debt | 5,174 | 4,670
General mortgage bonds, 2.35% to 6.95%, due 2026 to 2053 | Houston Electric |  |
Long-term debt: |  |
Long-Term | 8,412 | 7,512
Current | 0 | 0
Other | Houston Electric |  |
Long-term debt: |  |
Long-Term | 1 | 1
Current | 0 | 0
Transition bonds 3.028% due 2024 | Houston Electric |  |
Long-term debt: |  |
Long-Term | 0 | 0
Current | 0 | 161
Senior notes 1.75% to 6.625% due 2026 to 2047 | CERC |  |
Long-term debt: |  |
Long-Term | 4,520 | 4,120
Current | 0 | 0
Indiana Gas senior notes 6.34% to 7.08% due 2025 to 2029 | IGC |  |
Long-term debt: |  |
Long-Term | 86 | 96
Current | $ 10 | $ 0
Minimum | CenterPoint Energy senior notes 1.45% to 5.25% due 2026 to 2049 | CenterPoint Energy |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.45% |
Minimum | CenterPoint Energy junior subordinated notes 6.70% to 7.00% due 2055 | CenterPoint Energy |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.70% |
Minimum | SIGECO first mortgage bonds 3.450% to 6.00% due 2024 to 2055 | SIGECO |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.45% |
Minimum | SIGECO securitization bonds 5.026% to 5.172% due 2036 to 2041 | SIGECO |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.026% |
Minimum | General mortgage bonds, 2.35% to 6.95%, due 2026 to 2053 | Houston Electric |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.35% |
Minimum | Senior notes 1.75% to 6.625% due 2026 to 2047 | CERC |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.75% |
Minimum | Indiana Gas senior notes 6.34% to 7.08% due 2025 to 2029 | IGC |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.34% |
Maximum | CenterPoint Energy senior notes 1.45% to 5.25% due 2026 to 2049 | CenterPoint Energy |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.25% |
Maximum | CenterPoint Energy junior subordinated notes 6.70% to 7.00% due 2055 | CenterPoint Energy |  |
Debt Instrument [Line Items] |  |
Interest Rate | 7.00% |
Maximum | SIGECO first mortgage bonds 3.450% to 6.00% due 2024 to 2055 | SIGECO |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.00% |
Maximum | SIGECO securitization bonds 5.026% to 5.172% due 2036 to 2041 | SIGECO |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.172% |
Maximum | General mortgage bonds, 2.35% to 6.95%, due 2026 to 2053 | Houston Electric |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.95% |
Maximum | Transition bonds 3.028% due 2024 | Houston Electric |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.028% |
Maximum | Senior notes 1.75% to 6.625% due 2026 to 2047 | CERC |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.625% |
Maximum | Indiana Gas senior notes 6.34% to 7.08% due 2025 to 2029 | IGC |  |
Debt Instrument [Line Items] |  |
Interest Rate | 7.08% |

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