Segment and Related Information (Details) $ in Millions		3 Months Ended			9 Months Ended			12 Months Ended
		Sep. 30, 2024 USD ($)		Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Integer		Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 2,066		$ 2,043	$ 6,251		$ 6,281
Net income (loss)		214		230	711		627
Balance Sheet Data [Abstract]
Assets		40,472			40,472			$ 39,236
Segment (Numeric) [Abstract]
Goodwill		2,247			$ 2,247			2,247
Number of Reportable Segments | Integer					3
Kentucky Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		895		893	$ 2,698		2,631
Net income (loss)		169		175	493		432
Balance Sheet Data [Abstract]
Assets		17,356			17,356			17,029
Pennsylvania Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		716		737	2,159		2,295
Net income (loss)		142		136	441		384
Balance Sheet Data [Abstract]
Assets		15,328			15,328			14,294
Corporate and Other [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		0		0	1		0
Net income (loss)		(111)		(87)	(313)		(259)
Balance Sheet Data [Abstract]
Assets		835			835			1,398
Rhode Island Regulated
Income Statement Data [Abstract]
Operating Revenues from external customers		455		413	1,393		1,355	1,400
Net income (loss)		14		6	90		70
Balance Sheet Data [Abstract]
Assets		6,953			6,953			6,515
PPL Electric Utilities Corp [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		716		737	2,159		2,295
Net income (loss)	[1]	142		136	441		384
Balance Sheet Data [Abstract]
Assets		15,328			$ 15,328			14,294
Segment (Numeric) [Abstract]
Number of Reportable Segments | Integer					1
Number of Operating Segments | Integer					2
Louisville Gas And Electric Co [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		397		398	$ 1,239		1,227
Net income (loss)		77	[2]	79	232	[2]	210
Balance Sheet Data [Abstract]
Assets		7,878			7,878			7,753
Segment (Numeric) [Abstract]
Goodwill		389			$ 389			389
Number of Reportable Segments | Integer					1
Number of Operating Segments | Integer					1
Kentucky Utilities Co [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		509		505	$ 1,498		1,439
Net income (loss)	[3]	98		$ 101	283		$ 240
Balance Sheet Data [Abstract]
Assets		9,939			9,939			9,714
Segment (Numeric) [Abstract]
Goodwill		$ 607			$ 607			$ 607
Number of Reportable Segments | Integer					1
Number of Operating Segments | Integer					1

[1] Net income equals comprehensive income.

[2] Net income equals comprehensive income.

[3] Net income equals comprehensive income.