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.