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Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |  |
Balance at beginning of period | $ 2,248 |  |
Sale of Safari Holdings | 0 | $ (53) |
Balance at end of period | 2,247 | 2,248 |
Goodwill, Period Increase (Decrease) | (1) | 1,586 |
Goodwill |  | 2,248 | $ 715
Kentucky Regulated [Member] |  |  |
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |  |
Balance at beginning of period | 662 | 662 |
Sale of Safari Holdings | 0 | 0 |
Balance at end of period | 662 | 662 |
Goodwill, Period Increase (Decrease) | 0 | 0 |
Corporate And Other [Member] |  |  |
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |  |
Balance at beginning of period | 861 | 53 |
Sale of Safari Holdings | 0 | (53) |
Balance at end of period | 860 | 861 |
Goodwill, Period Increase (Decrease) | (1) | 861 |
Rhode Island Regulated |  |  |
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |  |
Balance at beginning of period | 725 | 0 |
Sale of Safari Holdings | 0 | 0 |
Balance at end of period | 725 | 725 |
Goodwill, Period Increase (Decrease) | $ 0 | $ 725 |

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