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Short-term Borrowings and Long-term Debt - Schedule of Debt (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) day | Dec. 31, 2022 USD ($)
Long-term debt: |  |
Unamortized debt issuance costs | $ (35) | $ (15)
Unamortized discount and premium, net | (5) | (6)
Long-term debt | 17,559 | 14,836
Current debt | $ 1,059 | 2,020
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 | $ (59) | (50)
Unamortized discount and premium, net | (28) | (27)
Long-term debt | 7,426 | 6,197
Current debt | 161 | 156
CERC Corp |  |
Long-term debt: |  |
Unamortized debt issuance costs | (31) | (22)
Unamortized discount and premium, net | 1 | (4)
Long-term debt | 4,670 | 3,495
Current debt | $ 4 | 1,842
Number of days until commercial paper maturity | day | 30 |
CERC Corp | Inventory Financing |  |
Long-term debt: |  |
Current debt | $ 4 | 11
CERC Corp | Term Loan |  |
Long-term debt: |  |
Current debt | 0 | 500
CERC Corp | CERC Debt |  |
Long-term debt: |  |
Current debt | $ 4 | 511
ZENS debt, due 2029 |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 2.00% |
Long-term debt: |  |
Long-Term | $ 0 | 0
Current | 5 | 7
CenterPoint Energy senior notes 1.45% to 5.989% due 2024 to 2049 |  |
Long-term debt: |  |
Long-Term | 3,250 | 3,050
Current | $ 850 | 0
CenterPoint Energy senior notes 1.45% to 5.989% due 2024 to 2049 | Minimum | CenterPoint Energy |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 1.45% |
CenterPoint Energy senior notes 1.45% to 5.989% due 2024 to 2049 | Maximum | CenterPoint Energy |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 5.989% |
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] |  |
Debt instrument interest rate (as a percent) | 5.125% |
CenterPoint Energy commercial paper |  |
Long-term debt: |  |
Long-Term | $ 1,036 | 1,770
Current | 0 | 0
CenterPoint Energy commercial paper | CERC Corp |  |
Long-term debt: |  |
Long-Term | 484 | 805
SIGECO first mortgage bonds 3.450% to 6.00% due 2024 to 2055 | SIGECO |  |
Long-term debt: |  |
Long-Term | 825 | 277
Current | $ 22 | 11
SIGECO first mortgage bonds 3.450% to 6.00% due 2024 to 2055 | Minimum | SIGECO |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 3.45% |
SIGECO first mortgage bonds 3.450% to 6.00% due 2024 to 2055 | Maximum | SIGECO |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 6.00% |
SIGECO securitization bonds 5.026% to 5.172% due 2036 to 2041 | SIGECO |  |
Long-term debt: |  |
Long-Term | $ 324 | 0
Current | $ 17 | 0
SIGECO securitization bonds 5.026% to 5.172% due 2036 to 2041 | Minimum | SIGECO |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 5.026% |
SIGECO securitization bonds 5.026% to 5.172% due 2036 to 2041 | Maximum | SIGECO |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 5.172% |
Other Debt |  |
Long-term debt: |  |
Long-Term | $ 0 | 0
Current | 0 | 4
CERC Debt | CERC Corp |  |
Long-term debt: |  |
Long-term debt | 4,670 | 3,495
General mortgage bonds, 2.35% to 6.95%, due 2026 to 2053 | Houston Electric |  |
Long-term debt: |  |
Long-Term | 7,512 | 6,112
Current | $ 0 | 0
General mortgage bonds, 2.35% to 6.95%, due 2026 to 2053 | Minimum | Houston Electric |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 2.35% |
General mortgage bonds, 2.35% to 6.95%, due 2026 to 2053 | Maximum | Houston Electric |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 6.95% |
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 | 161
Current | $ 161 | 156
Transition bonds 3.028% due 2024 | Maximum | Houston Electric |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 3.028% |
Senior notes 1.75% to 6.625% due 2026 to 2047 | CERC Corp |  |
Long-term debt: |  |
Long-Term | $ 4,120 | 2,620
Current | $ 0 | 1,331
Senior notes 1.75% to 6.625% due 2026 to 2047 | Minimum | CERC Corp |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 1.75% |
Senior notes 1.75% to 6.625% due 2026 to 2047 | Maximum | CERC Corp |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 6.625% |
Indiana Gas senior notes 6.34% to 7.08% due 2025 to 2029 | IGC |  |
Long-term debt: |  |
Long-Term | $ 96 | 96
Current | $ 0 | $ 0
Indiana Gas senior notes 6.34% to 7.08% due 2025 to 2029 | Minimum | IGC |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 6.34% |
Indiana Gas senior notes 6.34% to 7.08% due 2025 to 2029 | Maximum | IGC |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate (as a percent) | 7.08% |

X
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