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v3.25.0.1

Short-term Borrowings and Long-term Debt - Schedule of Debt Instruments Were Issued or Incurred (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 28, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 20,397 |  |  | $ 17,559
Houston Electric |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | 1,400 |  |  |
Long-term debt | 8,322 |  |  | 7,426
CERC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | 400 |  |  |
Long-term debt | 5,174 |  |  | $ 4,670
General Mortgage Bonds | Houston Electric |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from issuance of long-term debt and capital securities, net | 395 |  |  |
First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees | $ 159 |  |  |
Junior Subordinated Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 2.50% |  |  |
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees | $ 790 |  |  |
Debt Instrument, redemption price, principal amount redeemed | 500 |  |  |
Total CenterPoint Energy |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | 3,960 |  |  |
General Mortgage Bonds 5.15% Due 2034 | General Mortgage Bonds | Houston Electric |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | $ 400 |  |  |
Interest Rate | 5.15% |  |  |
Term Loan 1.00% Due 2025 | Term loan | Houston Electric |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | $ 500 |  |  |
Basis spread (as a percent) | 1.00% |  |  |
General Mortgage Bonds 5.05% Due 2035 | General Mortgage Bonds | Houston Electric |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | $ 500 |  |  |
Interest Rate | 5.05% |  |  |
Proceeds from issuance of long-term debt and capital securities, net | $ 494 |  |  |
CERC Senior Notes 5.40% Due 2034 | Senior Notes | CERC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | $ 400 |  |  |
Interest Rate | 5.40% |  |  |
Proceeds from issuance of long-term debt and capital securities, net | $ 396 |  |  |
CNP Senior Notes 5.40% Due 2029 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | $ 700 |  |  |
Interest Rate | 5.40% |  |  |
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees | $ 693 |  |  |
CNP First Mortgage Bonds 5.18% Due 2034 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | $ 100 |  |  |
Interest Rate | 5.18% |  |  |
CNP First Mortgage Bonds 5.28% Due 2036 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | $ 60 |  |  |
Interest Rate | 5.28% |  |  |
CNP Junior Subordinated Notes 7.00% Due 2055 | Junior Subordinated Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | $ 400 |  |  |
Interest Rate | 7.00% |  |  |
CNP Junior Subordinated Notes 6.85% Due 2055 | Junior Subordinated Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | $ 400 |  |  |
Interest Rate | 6.85% |  |  |
CNP Junior Subordinated Notes 6.70% Due 2055 | Junior Subordinated Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | $ 500 |  |  |
Interest Rate | 6.70% |  |  |
Long-term debt | $ 494 |  |  |
Delayed Draw Term Loan (DDTL) | Houston Electric |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread (as a percent) | 1.00% |  |  |
Long-term debt |  | $ 200 | $ 100 |
Debt instrument, annual adjustment | 0.10% |  |  |
Senior Notes Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, redemption price, principal amount redeemed | $ 350 |  |  |

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