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Acquisitions, Development and Divestitures - Acquisitions (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 25, 2022 USD ($) | Dec. 31, 2022 USD ($) MW | Jun. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period, After Remeasurement |  |  |  |  |  |  |  |  | $ 1,585.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt |  |  | $ 1,500.0 | $ 1,500.0 |  | $ 1,500.0 |  |  |  |
Operating Revenues |  |  |  |  |  |  |  | $ 8,462.0 | 8,312.0 | $ 7,902.0
Net income (loss) |  |  |  |  |  |  |  | 888.0 | 740.0 | 756.0
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  | 8,667.0 |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  |  |  | 790.0 |  |
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  | 223.0 |
Transition Service Agreement Expense |  |  |  |  |  |  |  | 137.0 | 228.0 | 123.0
Goodwill |  |  |  |  |  |  |  | 2,247.0 | 2,247.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables, Gross | $ 255.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, AR Reserve | 60.0 |  |  |  |  |  |  |  |  |
Business Combination, Transaction Costs Expense |  |  |  |  |  |  |  |  | 18.0 |
Payments to Acquire Businesses, Gross |  |  |  |  |  | 5,300.0 |  |  |  |
Disposal Group [Line Items] |  |  |  |  |  |  |  |  |  |
Income (Loss) from Discontinued Operations (net of income taxes) |  |  |  |  |  |  |  | 0.0 | 0.0 | 42.0
Payments to Acquire Businesses, Gross |  |  |  |  |  | 5,300.0 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, AR Reserve | 60.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables, Gross | 255.0 |  |  |  |  |  |  |  |  |
Business Combination, Transaction Costs Expense |  |  |  |  |  |  |  |  | 18.0 |
Business Combination, Integration Related Costs |  |  |  |  |  |  |  |  | 223.0 |
Transition Service Agreement Expense |  |  |  |  |  |  |  | 137.0 | 228.0 | 123.0
Corporate And Other [Member] |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period, After Remeasurement |  |  |  |  |  |  |  |  | 860.0 |
Operating Revenues |  |  |  |  |  |  |  | 0.0 | 1.0 | 23.0
Net income (loss) |  |  |  |  |  |  |  | 415.0 | 427.0 | 316.0
Goodwill, Measurement Period Adjustment |  |  |  |  |  |  |  | 1.0 |  |
Goodwill |  | $ 861.0 |  |  |  |  | $ 861.0 | 860.0 | 860.0 | 861.0
Rhode Island Regulated |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  | 2,024.0 | 1,851.0 | 1,038.0
Net income (loss) |  |  |  |  |  |  |  | (109.0) | (96.0) | 44.0
Goodwill |  | $ 725.0 |  |  |  |  | 725.0 | 725.0 | 725.0 | 725.0
LGE [Member] |  |  |  |  |  |  |  |  |  |
Disposal Group [Line Items] |  |  |  |  |  |  |  |  |  |
Expected Capital Cost Of Expansion Project |  |  |  |  |  |  |  | 1,000.0 |  |
CPCN NGCC Combustion Turbine Facilities, Power | MW |  | 640 |  |  |  |  |  |  |  |
KU [Member] |  |  |  |  |  |  |  |  |  |
Disposal Group [Line Items] |  |  |  |  |  |  |  |  |  |
Expected Capital Cost Of Expansion Project |  |  |  |  |  |  |  | 1,000.0 |  |
CPCN NGCC Combustion Turbine Facilities, Power | MW |  | 640 |  |  |  |  |  |  |  |
Rhode Island Energy |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 154.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 195.0 |  |  |  |  |  |  |  |  |
Business Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Unbilled Revenues | 54.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Regulatory Assets | 75.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other | 65.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets | 642.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 3,992.0 |  |  |  |  |  |  |  |  |
Public Utilities, Customer Bill Credit Agreement, Total | 50.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Regulatory Assets | 393.0 |  |  |  |  |  |  |  |  |
Goodwill, Business Combination | 1,585.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 164.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets | 6,134.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 6,776.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-Term Debt | 14.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | 180.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Taxes Accrued | 44.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other | 198.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities | 675.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt | 1,496.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Regulatory Liabilities | 643.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | 142.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities | 2,281.0 |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  | $ 3,820.0 |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  | 1,038.0 |  |  |
Net income (loss) |  |  |  |  |  |  | $ (44.0) |  |  |
Acquisition commitment write off expenses |  |  |  |  |  |  |  |  | 98.0 |
RICCREF Contribution Expense |  |  |  | 2.5 |  |  |  |  |  |
Accounts Receivable Forgiven, AR Reserve |  |  |  |  |  |  |  |  | 23.0 | 23.0
Accounts Receivable Forgiven, net |  |  |  |  | $ 21.0 |  |  |  |  |
Accounts Receivable Forgiven, Gross |  |  |  |  | 44.0 |  |  |  |  |
Public Utilities, Customer Bill Credit Agreement, Net of Tax | 40.0 |  |  |  |  |  |  |  |  |
Business Combination, Regulatory Assets Expensed |  |  |  |  |  | 20.0 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Regulatory Liabilities | 239.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Price Risk Management Assets | 99.0 |  |  |  |  |  |  |  |  |
Disposal Group [Line Items] |  |  |  |  |  |  |  |  |  |
Accounts Receivable Forgiven, AR Reserve |  |  |  |  |  |  |  |  | 23.0 | 23.0
Rhode Island Energy | Electric Customer |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Public Utilities, Customer Bill Credit Agreement, Total | 33.0 |  |  |  |  |  |  |  |  |
Rhode Island Energy | Natural Gas Customer |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Public Utilities, Customer Bill Credit Agreement, Total | $ 17.0 |  |  |  |  |  |  |  |  |
Rhode Island Energy | Accounts Receivable and Regulatory Asset write off |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition commitment write off expenses |  |  |  |  |  |  |  |  | 43.0 |
Rhode Island Energy | Accrued expenditures for the RIAG and decarbonization goals |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition commitment write off expenses |  |  |  |  |  |  |  |  | 5.0 |
Rhode Island Energy | RIPUC regulatory liability |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities |  |  |  |  | $ 50.0 |  |  |  | 50.0 |
Rhode Island Energy | Rhode Island Energy TSA |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Other Nonrecurring (Income) Expense |  |  |  |  |  |  |  | 307.0 | 262.0 | 181.0
Disposal Group [Line Items] |  |  |  |  |  |  |  |  |  |
Other Nonrecurring (Income) Expense |  |  |  |  |  |  |  | 307.0 | 262.0 | 181.0
Rhode Island Energy | Accrual for TSA Markup |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Other Nonrecurring (Income) Expense |  |  |  |  |  |  |  | 10.0 | 7.0 | 3.0
Disposal Group [Line Items] |  |  |  |  |  |  |  |  |  |
Other Nonrecurring (Income) Expense |  |  |  |  |  |  |  | 10.0 | 7.0 | 3.0
Rhode Island Energy | Accrual for RIAG Evaluation Fund |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Other Nonrecurring (Income) Expense |  |  |  | 2.5 |  |  |  |  |  |
Disposal Group [Line Items] |  |  |  |  |  |  |  |  |  |
Other Nonrecurring (Income) Expense |  |  |  | $ 2.5 |  |  |  |  |  |
WPD [Member] |  |  |  |  |  |  |  |  |  |
Disposal Group [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax related to Discontinued Operations |  |  |  |  |  |  |  | 0.0 | 0.0 | (42.0)
Transaction Costs | Additional Costs Related to Purchase, Agreed not to seek recovery |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized |  |  |  |  |  |  |  | $ 28.0 |  |
Transaction Costs | Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses | Additional Costs Related to Purchase, Agreed not to seek recovery |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized |  |  |  |  |  |  |  |  |  | 18.0
Disposal Group, Held-for-sale, Not Discontinued Operations | Safari Holdings LLC, Consolidated |  |  |  |  |  |  |  |  |  |
Disposal Group [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business, net of tax |  |  |  |  |  |  |  |  | 5.0 | 46.0
Loss on Sale |  |  |  |  |  |  |  |  | $ 6.0 | 60.0
Discontinued Operations, Held-for-sale | WPD [Member] |  |  |  |  |  |  |  |  |  |
Disposal Group [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax related to Discontinued Operations |  |  |  |  |  |  |  |  |  | $ 42.0
Narragansett Electric |  |  |  |  |  |  |  |  |  |
Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  | $ 3,800.0 |  |  |  |

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