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v3.24.0.1

Short-term Borrowings and Long-term Debt - Debt Repayments and Redemptions (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 15, 2023 | Jan. 17, 2023 | Dec. 31, 2023
Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  |  | $ 3,023
CERC Corp |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  |  | $ 2,000
CERC Corp | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate (as a percent) |  |  | 0.70%
CERC Corp | Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  |  | $ 2,332
CERC Term Loan Zero Point Seven Due 2023 | CERC Corp |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  |  | $ 500
CERC Term Loan Zero Point Seven Due 2023 | CERC Corp | SOFR |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate (as a percent) |  |  | 0.70%
CERC Senior Notes 0.70 percentage Due 2023 | CERC Corp | Long-term Debt | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  |  | $ 700
Debt instrument interest rate (as a percent) |  |  | 0.70%
CERC Floating Rate Senior Notes Zero Point Five Percentage Due 2023 | CERC Corp | Long-term Debt | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  |  | $ 575
CERC Floating Rate Senior Notes Zero Point Five Percentage Due 2023 | CERC Corp | LIBOR Plus | Long-term Debt | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate (as a percent) |  |  | 0.50%
CERC Term Loan 0.85% Due 2024 | CERC Corp | Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  |  | $ 500
CERC Term Loan 0.85% Due 2024 | CERC Corp | SOFR | Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread (as a percent) |  |  | 0.85%
Adjustment to basis spread (as a percent) |  |  | 0.10%
CERC Senior Notes 3.72 percentage Due 2023 | CERC Corp | Long-term Debt | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  |  | $ 57
Debt instrument interest rate (as a percent) |  |  | 3.72%
CNP First Mortgage Bonds 4.00% Due 2044 | SIGECO | Long-term Debt | First Mortgage Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  | $ 11 | $ 11
Debt instrument interest rate (as a percent) |  |  | 4.00%
Debt instrument, redemption price (as a percent) |  | 100.00% |
CNP Term Loan 1.50% Due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  |  | $ 250
CNP Term Loan 1.50% Due 2023 | Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  |  | $ 250
CNP Term Loan 1.50% Due 2023 | SOFR | Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate (as a percent) |  |  | 1.50%
Basis spread (as a percent) |  |  | 1.50%
Adjustment to basis spread (as a percent) |  |  | 0.10%
CERC Floating Rate Senior Notes Zero Point Six Five Percentage Due 2024 | Long-term Debt | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  |  | $ 350
Debt instrument, redemption price (as a percent) | 100.00% |  |
CERC Floating Rate Senior Notes Zero Point Six Five Percentage Due 2024 | SOFR | Long-term Debt | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate (as a percent) |  |  | 0.65%
CNP First Mortgage Bonds 6.72% Due 2029 | SIGECO | Long-term Debt | First Mortgage Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of debt issued |  |  | $ 80
Debt instrument interest rate (as a percent) |  |  | 6.72%
Basis spread (as a percent) |  |  | 0.10%

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