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v3.25.1

Short-term Borrowings and Long-term Debt - Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended
--- | --- | ---
Jan. 31, 2025 | Mar. 31, 2025 | Feb. 28, 2025
Medium Term Notes, Series F, Due 2028 | CERC |  |  |
Debt Instrument [Line Items] |  |  |
Annual interest rate (as a percent) |  | 6.36% |
Principal amount repurchased |  | $ 10 |
Debt instrument, redemption price, percentage of principal amount redeemed |  | 104.80% |
SIGECO |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of property additions (as a percent) |  | 70.00% |
Outstanding debt balance |  | $ 1,100 |
Additional debt issuable |  | 899 |
SIGECO | 5.69% First Mortgage Bonds, Series 2025A | First Mortgage Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal | $ 165 |  |
Annual interest rate (as a percent) | 5.69% |  |
Proceeds from issuance of long-term debt and capital securities, net | $ 164 |  |
Houston Electric |  |  |
Debt Instrument [Line Items] |  |  |
Additional first mortgage bonds and general mortgage bonds that could be issued |  | 4,600 |
Houston Electric | General Mortgage Bonds, 2.35% to 6.95%, Due 2026 to 2053 |  |  |
Debt Instrument [Line Items] |  |  |
Secured debt |  | 9,000 |
Houston Electric | Bonds Pollution Control Due Range 1 |  |  |
Debt Instrument [Line Items] |  |  |
Secured debt |  | $ 68 |
Percentage of property additions (as a percent) |  | 70.00% |
Houston Electric | General Mortgage Bonds 5.15% Due 2034 | General Mortgage Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal |  |  | $ 500
Annual interest rate (as a percent) |  |  | 4.80%
Proceeds from issuance of long-term debt and capital securities, net |  |  | $ 495

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