Segment and Related Information (Details) $ in Millions		3 Months Ended
		Mar. 31, 2022 USD ($) Integer	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 1,782	$ 1,498
Net income (loss)		273	(1,840)
Balance Sheet Data [Abstract]
Assets		34,107		$ 33,223
Segment (Numeric) [Abstract]
Goodwill		716		716
Kentucky Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		1,004	885
Net income (loss)		179	146
Balance Sheet Data [Abstract]
Assets		16,317		16,360
Pennsylvania Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		775	605
Net income (loss)		143	113
Balance Sheet Data [Abstract]
Assets		13,374		13,336
Corporate and Other [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		3	8
Net income (loss)		(49)	(56)
Balance Sheet Data [Abstract]
Assets		4,416		3,527
DiscontinuedOperationsSegment
Income Statement Data [Abstract]
Net income (loss)		0	(2,043)
PPL Electric Utilities Corp [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		775	605
Net income (loss)	[1]	143	113
Balance Sheet Data [Abstract]
Assets		$ 13,374		13,302
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		$ 493	428
Net income (loss)	[2]	93	75
Balance Sheet Data [Abstract]
Assets		7,524		7,592
Segment (Numeric) [Abstract]
Goodwill		$ 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		$ 525	469
Net income (loss)	[3]	107	$ 86
Balance Sheet Data [Abstract]
Assets		9,293		9,272
Segment (Numeric) [Abstract]
Goodwill		$ 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.