Acquisitions, Development and Divestitures - Development (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2025		Sep. 30, 2024	Sep. 30, 2025		Sep. 30, 2024	Dec. 31, 2024
Business Combination [Line Items]
Transition Service Agreement Cost		$ 32			$ 129
Goodwill		2,247			2,247			$ 2,247
Revenues		2,239		$ 2,066	6,768		$ 6,251
Net income (loss)		318		214	915		711
Indemnification for Safari sale/leaseback					25
Louisville Gas And Electric Co [Member]
Business Combination [Line Items]
Goodwill		389			389			389
Revenues		427		397	1,310		1,239
Net income (loss)		83	[1]	77	244	[1]	232
Kentucky Utilities Co [Member]
Business Combination [Line Items]
Goodwill		607			607			$ 607
Revenues		530		509	1,566		1,498
Net income (loss)	[2]	109		98	312		283
Rhode Island Regulated
Business Combination [Line Items]
Revenues		509		455	1,629		1,393
Net income (loss)		27		14	80		90
Corporate and Other [Member]
Business Combination [Line Items]
Revenues		0		0	0		1
Net income (loss)		(53)		(111)	(181)		(313)
Rhode Island Energy | Rhode Island Energy TSA
Business Combination [Line Items]
Other Nonrecurring (Income) Expense		$ 18		$ 85	$ 52		$ 250

[1] Net income equals comprehensive income.

[2] Net income equals comprehensive income.