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Acquisitions, Development and Divestitures - Development (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 06, 2023 MW | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2023 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Transition Service Agreement Cost |  |  | $ 49 |  | $ 63 | $ 97 |  | $ 120 |  |
Goodwill |  |  | 2,247 |  |  | 2,247 |  |  |  | $ 2,247
Operating Revenues from external customers |  |  | 1,881 |  | 1,823 | 4,185 |  | 4,238 |  |
Net income (loss) |  |  | 190 |  | 112 | 497 |  | 397 |  |
Indemnification for Safari sale/leaseback |  |  |  |  |  | 25 |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 389 |  |  | 389 |  |  |  | 389
Operating Revenues from external customers |  |  | 366 |  | 355 | 842 |  | 829 |  |
Net income (loss) |  |  | 62 | [1] | 45 | 155 | [1] | 131 |  |
New NGCC LG&E Planned Ownership Percentage |  | 31.00% |  |  |  |  |  |  |  |
CPCN NGCC Combustion Turbine Facilities Power | MW |  | 640 |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 607 |  |  | 607 |  |  |  | $ 607
Operating Revenues from external customers |  |  | 464 |  | 435 | 989 |  | 934 |  |
Net income (loss) | [2] |  | 77 |  | 51 | 185 |  | 139 |  |
New NGCC KU Planned Ownership Percentage |  | 69.00% |  |  |  |  |  |  |  |
CPCN NGCC Combustion Turbine Facilities Power | MW |  | 640 |  |  |  |  |  |  |  |
Narragansett Electric |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Total cash consideration |  |  |  |  |  |  |  |  | $ 3,800 |
Rhode Island Regulated |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  | 389 |  | 377 | 938 |  | 942 |  |
Net income (loss) |  |  | 12 |  | 10 | 76 |  | 64 |  |
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  | 0 |  | 1 | 1 |  | 0 |  |
Net income (loss) |  |  | (106) |  | (99) | (202) |  | (172) |  |
Rhode Island Energy | Rhode Island Energy TSA |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Other Nonrecurring (Income) Expense |  |  | 83 |  | 70 | 165 |  | 124 |  |
Rhode Island Energy | Accrual for TSA Markup |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Other Nonrecurring (Income) Expense |  |  | 2 |  | $ 2 | 3 |  | $ 4 |  |
LGE [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
CPCN NGCC Combustion Turbine Facilities Power | MW |  | 640 |  |  |  |  |  |  |  |
KU [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
CPCN NGCC Combustion Turbine Facilities Power | MW |  | 640 |  |  |  |  |  |  |  |
LKE [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
ExpectedCapitalCostOfExpansionProject |  |  | $ 1,000 |  |  | $ 1,000 |  |  |  |
[1] | Net income equals comprehensive income.
[2] | Net income equals comprehensive income.

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