Acquisitions, Development and Divestitures - Development (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025		Mar. 31, 2024	Dec. 31, 2024
Business Combination [Line Items]
Transition Service Agreement Cost		$ 48
Goodwill		2,247			$ 2,247
Revenues		2,504		$ 2,304
Net income (loss)		414		307
Indemnification for Safari sale/leaseback		25
Louisville Gas And Electric Co [Member]
Business Combination [Line Items]
Goodwill		389			389
Revenues		505		476
Net income (loss)		105	[1]	93
Kentucky Utilities Co [Member]
Business Combination [Line Items]
Goodwill		607			$ 607
Revenues		564		525
Net income (loss)	[2]	125		108
Rhode Island Regulated
Business Combination [Line Items]
Revenues		626		549
Net income (loss)		70		64
Corporate and Other [Member]
Business Combination [Line Items]
Revenues		0		1
Net income (loss)		(63)		(96)
Rhode Island Energy | Rhode Island Energy TSA
Business Combination [Line Items]
Other Nonrecurring (Income) Expense		$ 17		$ 81

[1] Net income equals comprehensive income.

[2] Net income equals comprehensive income.