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REGULATORY MATTERS - GAS Rate Proceedings and Deferral of Incremental COVID-19 Costs (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2027 | Jan. 01, 2026 | Jan. 03, 2025 | Jan. 01, 2025 | Dec. 24, 2024 | Aug. 01, 2024 | Jul. 02, 2024 | Jun. 07, 2024 | Jan. 01, 2024 | Jan. 01, 2023 | Nov. 30, 2023 | Aug. 31, 2023 | Nov. 30, 2021 | Apr. 30, 2021 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2019
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,523.0 |  | $ 7,041.0 | $ 6,523.0 |  |
Nicor Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  | $ 223.0 |  |  |  |  |  |  |  |  |
Authorized ROE |  |  |  |  |  |  |  |  |  |  | 9.51% |  |  |  |  |  | 9.51% |  |  |
Public utilities, approved equity capital structure, percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Infrastructure disallowed |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69.0 |  |  |  |  |
Pretax charge to income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58.0 | $ 38.0 | $ (96.0) |  |  |
After tax charge to income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44.0 | $ 28.0 | (72.0) |  |  |
Nicor Gas | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized ROE |  |  | 10.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved equity capital structure, percentage |  |  | 54.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 309.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nicor Gas | Investing In Illinois Qualifying Infrastructure Plant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure disallowed |  |  |  |  | $ 14.0 |  |  |  |  |  | $ 126.8 |  |  |  |  |  | 63.0 |  |  | $ 32.0
Nicor Gas | QIP Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure disallowed |  |  |  |  |  |  |  |  |  |  | 31.0 |  |  |  |  |  |  |  |  |
Nicor Gas | Other Transmission and Distribution Capital Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure disallowed |  |  |  |  |  |  |  |  |  |  | $ 95.9 |  |  |  |  |  |  |  |  |
Atlanta Gas Light |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (9.0) | (7.0) | $ (5.0) |
Authorized ROE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.25% |  |  |
Public utilities, maximum base rate percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |
Integrated capacity delivery plan, capital budgets and related operations and maintenance spending, term |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Approved rate decrease, percent |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Integrated capacity delivery plan, capital forecast plan, years one through three |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700.0 |  |  |  |  |  |  |
Approved annual recovery of capital investment |  |  |  |  |  |  | $ 600.0 |  |  |  |  |  |  |  |  |  |  |  | 286.0 |
Atlanta Gas Light | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized ROE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.05% |  |  |
Integrated capacity delivery plan, capital forecast plan, years one through ten |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500.0 |  |  |  |  |  |
Atlanta Gas Light | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized ROE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.45% |  |  |
Integrated capacity delivery plan, capital forecast plan, years one through ten |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600.0 |  |  |  |  |  |
Southern Company Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pretax charge to income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | 96.0 | $ 0.0 |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  | $ 53.0 | $ 53.0 |  |  |  |  |  |  |  |  |  |
Net regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2,225.0) |  | $ (2,252.0) | $ (2,225.0) |  |
Southern Company Gas | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 74.0 | $ 73.0 |  | $ 72.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Southern Company Gas | SAVE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved infrastructure replacement program, approved investment amount, current fiscal year |  |  |  |  |  |  |  | $ 355.0 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure replacement program, approved investment variance amount |  |  |  |  |  |  |  | $ 5.0 |  |  |  |  |  |  |  |  |  |  |  |
Program duration period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Southern Company Gas | SAVE | 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved infrastructure replacement program, approved investment amount, current fiscal year |  |  |  |  |  |  |  | $ 70.0 |  |  |  |  |  |  |  |  |  |  |  |
Southern Company Gas | SAVE | 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved infrastructure replacement program, approved investment amount, current fiscal year |  |  |  |  |  |  |  | 70.0 |  |  |  |  |  |  |  |  |  |  |  |
Southern Company Gas | SAVE | 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved infrastructure replacement program, approved investment amount, current fiscal year |  |  |  |  |  |  |  | 70.0 |  |  |  |  |  |  |  |  |  |  |  |
Southern Company Gas | SAVE | 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved infrastructure replacement program, approved investment amount, current fiscal year |  |  |  |  |  |  |  | 70.0 |  |  |  |  |  |  |  |  |  |  |  |
Southern Company Gas | SAVE | 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved infrastructure replacement program, approved investment amount, current fiscal year |  |  |  |  |  |  |  | $ 70.0 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Natural Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  | $ 48.0 |  |  |  |  |  |  |  |
Authorized ROE |  |  |  |  |  |  |  |  |  |  |  | 9.70% |  |  |  |  | 9.70% |  |  |
Public utilities, approved equity capital structure, percentage |  |  |  |  |  |  |  |  |  |  |  | 49.06% |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  | $ 69.0 |  |  |  |  |  |  |  |  |  |
Virginia Natural Gas | Virginia Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized ROE |  |  |  |  |  | 10.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved equity capital structure, percentage |  |  |  |  |  | 54.92% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 63.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Natural Gas | SAVE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved infrastructure replacement program, approved investment amount, current fiscal year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 365.0 |  |  |
Infrastructure replacement program, approved investment variance amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.0 |  |  |
Program duration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |  |
Virginia Natural Gas | SAVE | Virginia Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 17.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Natural Gas | SAVE | Year 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved infrastructure replacement program, approved investment amount, current fiscal year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 70.0 |  |  |
Virginia Natural Gas | SAVE | Year 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved infrastructure replacement program, approved investment amount, current fiscal year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.0 |  |  |
Virginia Natural Gas | SAVE | Year 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved infrastructure replacement program, approved investment amount, current fiscal year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 70.0 |  |  |

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