Segment and Related Information (Details) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)		Sep. 30, 2020 USD ($) Integer		Sep. 30, 2019 USD ($)		Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 1,885	$ 1,933		$ 5,678		$ 5,815
Net Income		281	475		1,179		1,382
Balance Sheet Data [Abstract]
Assets		47,924			47,924					$ 45,680
Segment (Numeric) [Abstract]
Goodwill		3,283			3,283					3,198
U.K. Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		485	491		1,575		1,615
Net Income		55	236		574		784
Balance Sheet Data [Abstract]
Assets		19,183			19,183					17,622
Segment (Numeric) [Abstract]
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation		14,200			14,200					13,200
Goodwill		2,600			2,600				$ 2,500	2,500
Kentucky Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		806	844		2,331		2,421
Net Income		129	150		330		364
Balance Sheet Data [Abstract]
Assets		15,754			15,754					15,597
Pennsylvania Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		586	590		1,748		1,756
Net Income		135	118		371		333
Balance Sheet Data [Abstract]
Assets		12,225			12,225					11,918
Corporate and Other [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		8	8		24		23
Net Income		(38)	(29)		(96)		(99)
Balance Sheet Data [Abstract]
Assets		762			762					543
PPL Electric Utilities Corp [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		586	590		1,748		1,756
Net Income	[1]	134	118		370		333
Balance Sheet Data [Abstract]
Assets		12,213			$ 12,213					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		806	844		$ 2,331		2,421
Net Income		137	158	[2]	355	[2]	388	[2]
Balance Sheet Data [Abstract]
Assets		16,088			16,088					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		363	382		$ 1,092		1,126
Net Income	[3]	71	80		191		188
Balance Sheet Data [Abstract]
Assets		7,221			7,221					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		452	466		$ 1,272		1,322
Net Income	[4]	84	$ 95		217		$ 237
Balance Sheet Data [Abstract]
Assets		8,980			8,980					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.