Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward]
Balance at beginning of period	$ 2,247
Balance at end of period	2,247	$ 2,247
Goodwill, Period Increase (Decrease)	0	(1)
Goodwill		2,247	$ 2,248
Kentucky Regulated [Member]
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward]
Balance at beginning of period	662	662
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	860	861
Balance at end of period	860	860
Goodwill, Period Increase (Decrease)	0	(1)
Rhode Island Regulated
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward]
Balance at beginning of period	725	725
Balance at end of period	725	725
Goodwill, Period Increase (Decrease)	$ 0	$ 0