Segment and Related Information (Details) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2019 USD ($)		Sep. 30, 2018 USD ($)		Sep. 30, 2019 USD ($) Integer		Sep. 30, 2018 USD ($)		Dec. 31, 2018 USD ($)
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 1,933		$ 1,872		$ 5,815		$ 5,846
Net Income		475		445		1,382		1,412
Balance Sheet Data [Abstract]
Assets		44,559				44,559				$ 43,396
Segment (Numeric) [Abstract]
Goodwill		3,050				3,050				3,162
U.K. Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		491		517		1,615		1,716
Net Income		236		245		784		836
Balance Sheet Data [Abstract]
Assets		17,128				17,128				16,700
Segment (Numeric) [Abstract]
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation		12,300				12,300				12,400
Goodwill		2,300				2,300				2,400
Kentucky Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		844		802		2,421		2,417
Net Income		150		122		364		332
Balance Sheet Data [Abstract]
Assets		15,434				15,434				15,078
Pennsylvania Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		590		548		1,756		1,704
Net Income		118		112		333		335
Balance Sheet Data [Abstract]
Assets		12,116				12,116				11,257
Corporate and Other [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		8		5		23		9
Net Income		(29)		(34)		(99)		(91)
Balance Sheet Data [Abstract]
Assets		(119)				(119)				361
PPL Electric Utilities Corp [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		590		548		1,756		1,704
Net Income	[1]	118		111		333		334
Balance Sheet Data [Abstract]
Assets		12,071				$ 12,071				11,243
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		844		802		$ 2,421		2,417
Net Income	[2]	158		130		388		358
Balance Sheet Data [Abstract]
Assets		15,768				15,768				15,412
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		382		362		$ 1,126		1,116
Net Income		80	[1]	66	[1]	188	[3]	188	[3]
Balance Sheet Data [Abstract]
Assets		7,027				7,027				6,883
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		466		447		$ 1,322		1,332
Net Income	[4]	95		$ 77		237		$ 225
Balance Sheet Data [Abstract]
Assets		8,742				8,742				8,540
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.