Segment and Related Information (Details) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)		Jun. 30, 2020 USD ($) Integer		Jun. 30, 2019 USD ($)		Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 1,739	$ 1,803		$ 3,793		$ 3,882
Net Income		344	441		898		907
Balance Sheet Data [Abstract]
Assets		46,520			46,520					$ 45,680
Segment (Numeric) [Abstract]
Goodwill		3,086			3,086					3,198
U.K. Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		476	541		1,090		1,124
Net Income		179	284		519		548
Balance Sheet Data [Abstract]
Assets		17,479			17,479					17,622
Segment (Numeric) [Abstract]
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation		12,900			12,900					13,200
Goodwill		2,400			2,400				$ 2,500	2,500
Kentucky Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		700	732		1,525		1,577
Net Income		74	97		201		214
Balance Sheet Data [Abstract]
Assets		15,802			15,802					15,597
Pennsylvania Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		554	521		1,162		1,166
Net Income		118	94		236		215
Balance Sheet Data [Abstract]
Assets		12,036			12,036					11,918
Corporate and Other [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		9	9		16		15
Net Income		(27)	(34)		(58)		(70)
Balance Sheet Data [Abstract]
Assets		1,203			1,203					543
PPL Electric Utilities Corp [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		554	521		1,162		1,166
Net Income	[1]	118	94		236		215
Balance Sheet Data [Abstract]
Assets		12,020			$ 12,020					11,901
Segment (Numeric) [Abstract]
Number of Reportable Segments | Integer					1
Number of Operating Segments | Integer					2
LG And E And KU Energy LLC [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		700	732		$ 1,525		1,577
Net Income		83	106	[2]	218	[2]	230	[2]
Balance Sheet Data [Abstract]
Assets		16,136			16,136					15,931
Segment (Numeric) [Abstract]
Goodwill		996			$ 996					996
Number of Reportable Segments | Integer					1
Number of Operating Segments | Integer					1
Louisville Gas And Electric Co [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		322	334		$ 729		744
Net Income	[3]	47	44		120		108
Balance Sheet Data [Abstract]
Assets		7,156			7,156					7,133
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		388	406		$ 820		856
Net Income	[4]	53	$ 61		133		$ 142
Balance Sheet Data [Abstract]
Assets		9,243			9,243					8,825
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 approximates comprehensive income.

[3] Net income equals comprehensive income.

[4] Net income equals comprehensive income.