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v3.25.2

Short-term Borrowings and Long-term Debt - Narrative (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2025 | Jan. 29, 2025 | Jun. 30, 2025 | May 31, 2025 | Mar. 31, 2025 | Feb. 28, 2025 | Jun. 30, 2025 | Apr. 30, 2025
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit agreement term (in years) |  | 1 year |  |  |  |  |  |
CERC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Gain from early extinguishment of debt |  |  |  |  |  |  | $ 9 |
Parent Company |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Gain from early extinguishment of debt |  |  |  |  |  |  | $ 36 |
SIGECO |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of property additions (as a percent) |  |  | 70.00% |  |  |  | 70.00% |
Outstanding debt balance |  |  | $ 1,100 |  |  |  | $ 1,100 |
Additional debt issuable |  |  | 1,100 |  |  |  | 1,100 |
Houston Electric |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Additional first mortgage bonds and general mortgage bonds that could be issued |  |  | 4,500 |  |  |  | 4,500 |
Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount repurchased |  |  |  | $ 1,000 |  |  |  |
Senior Notes | Parent Company |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount of cancelled debt |  |  |  | 634 |  |  |  |
Senior Notes | CERC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount of cancelled debt |  |  |  | $ 415 |  |  |  |
General Mortgage Bonds, 2.35% to 6.95%, Due 2026 to 2053 | Houston Electric |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured debt |  |  | 9,000 |  |  |  | 9,000 |
Bonds Pollution Control Due Range 1 | Houston Electric |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured debt |  |  | $ 68 |  |  |  | $ 68 |
Percentage of property additions (as a percent) |  |  | 70.00% |  |  |  | 70.00% |
5.69% First Mortgage Bonds, Series 2025A | First Mortgage Bonds | SIGECO |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
General Mortgage Bonds 5.15% Due 2034 | General Mortgage Bonds | Houston Electric |  |  |  |  |  |  |  |
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 |  |
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% |  |  |
Senior Notes Due 2026 to 2031 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Cash tender offers |  |  |  |  |  |  |  | $ 600
Senior Notes Due 2026 to 2031 | Senior Notes | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual interest rate (as a percent) |  |  |  |  |  |  |  | 2.65%
Senior Notes Due 2026 to 2031 | Senior Notes | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual interest rate (as a percent) |  |  |  |  |  |  |  | 5.40%
Senior Notes Due 2028 to 2047 | Senior Notes | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual interest rate (as a percent) |  |  |  |  |  |  |  | 4.10%
Senior Notes Due 2028 to 2047 | Senior Notes | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual interest rate (as a percent) |  |  |  |  |  |  |  | 5.40%
Senior Notes Due 2028 to 2047 | Senior Notes | CERC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Cash tender offers |  |  |  |  |  |  |  | $ 400
Medium Term Notes, Series E, Due 2025 | CERC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual interest rate (as a percent) |  |  | 6.53% |  |  |  | 6.53% |
Principal amount repurchased |  |  | $ 10 |  |  |  |  |
Debt instrument, redemption price, percentage of principal amount redeemed |  |  | 100.00% |  |  |  |  |

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