CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Millions		Total	Common Stock [Member]		Additional Paid-in Capital [Member]	Earnings Reinvested [Member]	Accumulated Other Comprehensive Loss [Member]	PPL Electric Utilities Corp [Member]		PPL Electric Utilities Corp [Member] Common Stock [Member]		PPL Electric Utilities Corp [Member] Additional Paid-in Capital [Member]	PPL Electric Utilities Corp [Member] Earnings Reinvested [Member]	LG And E And KU Energy LLC [Member]		Louisville Gas And Electric Co [Member]		Louisville Gas And Electric Co [Member] Common Stock [Member]		Louisville Gas And Electric Co [Member] Additional Paid-in Capital [Member]	Louisville Gas And Electric Co [Member] Earnings Reinvested [Member]	Kentucky Utilities Co [Member]		Kentucky Utilities Co [Member] Common Stock [Member]		Kentucky Utilities Co [Member] Additional Paid-in Capital [Member]	Kentucky Utilities Co [Member] Earnings Reinvested [Member]	Kentucky Utilities Co [Member] Accumulated Other Comprehensive Loss [Member]
Balance at beginning of period - shares at Dec. 31, 2016			679,731	[1]						66,368	[2]							21,294	[3]					37,818	[4]
Balance at beginning of period at Dec. 31, 2016		$ 9,899	$ 7		$ 9,841	$ 3,829	$ (3,778)	$ 3,391		$ 364		$ 2,154	$ 873			$ 2,476		$ 424		$ 1,682	$ 370	$ 3,323		$ 308		$ 2,616	$ 400	$ (1)
Balance at beginning of period at Dec. 31, 2016														$ 4,667
Common stock shares issued	[1]		2,696
Common stock issued		97			97
Stock-based compensation		(21)			(21)
Net Income		403				403		79	[5]				79	103	[6]	54	[5]				54	63	[6]				63
Capital contributions from parent								100				100
Dividends and dividend equivalents		(270)				(270)
Dividends declared on common stock								(76)					(76)			(87)					(87)	(70)					(70)
Distributions to member														(102)
Other comprehensive income (loss)		1					1							2								1						1
Balance at end of period - shares at Mar. 31, 2017			682,427	[1]						66,368	[2]							21,294	[3]					37,818	[4]
Balance at end of period at Mar. 31, 2017		$ 10,109	$ 7		9,917	3,962	(3,777)	$ 3,494		$ 364		2,254	876			$ 2,443		$ 424		1,682	337	$ 3,317		$ 308		2,616	393	0
Balance at end of period at Mar. 31, 2017														4,670
Balance at beginning of period - shares at Dec. 31, 2017		693,398	693,398	[1]				66,368		66,368	[2]					21,294		21,294	[3]			37,818		37,818	[4]
Balance at beginning of period at Dec. 31, 2017		$ 10,761	$ 7		10,305	3,871	(3,422)	$ 3,992		$ 364		2,729	899			$ 2,527		$ 424		1,712	391	$ 3,357		$ 308		2,616	433	0
Balance at beginning of period at Dec. 31, 2017														4,563
Common stock shares issued	[1]		3,985
Common stock issued		115			115
Stock-based compensation		(9)			(9)
Net Income		452				452		148	[5]				148	142	[6]	72	[5]				72	87	[6]				87
Dividends and dividend equivalents		(286)				(286)
Dividends declared on common stock								$ (72)					(72)			$ (34)					(34)	$ (79)					(79)
Distributions to member														(69)
Other comprehensive income (loss)		$ 143					143							1
Balance at end of period - shares at Mar. 31, 2018		697,383	697,383	[1]				66,368		66,368	[2]					21,294		21,294	[3]			37,818		37,818	[4]
Balance at end of period at Mar. 31, 2018		$ 11,176	$ 7		$ 10,411	$ 4,037	$ (3,279)	$ 4,068		$ 364		$ 2,729	$ 975			$ 2,565		$ 424		$ 1,712	$ 429	$ 3,365		$ 308		$ 2,616	$ 441	$ 0
Balance at end of period at Mar. 31, 2018														$ 4,637

[1] Shares in thousands. Each share entitles the holder to one vote on any question presented at any shareowners' meeting.

[2] Shares in thousands. All common shares of PPL Electric stock are owned by PPL.

[3] Shares in thousands. All common shares of LG&E stock are owned by LKE.

[4] Shares in thousands. All common shares of KU stock are owned by LKE.

[5] Net income equals comprehensive income.

[6] Net income approximates comprehensive income.