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]		5,742
Common stock issued		202			202
Stock-based compensation		(20)			(20)
Net Income		695				695		156	[5]				156	190	[6]	96	[5]				96	119	[6]				119
Capital contributions from parent								575				575
Dividends and dividend equivalents		(541)				(541)
Dividends declared on common stock								(154)					(154)			(122)					(122)	(110)					(110)
Distributions to member														(218)
Other comprehensive income (loss)		255					255							(7)								1						1
Balance at end of period - shares at Jun. 30, 2017			685,473	[1]						66,368	[2]							21,294	[3]					37,818	[4]
Balance at end of period at Jun. 30, 2017		$ 10,490	$ 7		10,023	3,983	(3,523)	$ 3,968		$ 364		2,729	875			$ 2,450		$ 424		1,682	344	$ 3,333		$ 308		2,616	409	0
Balance at end of period at Jun. 30, 2017														4,632
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]		5,730
Common stock issued		163			163
Stock-based compensation		(6)			(6)
Net Income		967				967		223	[5]				223	228	[6]	122	[5]				122	148	[6]				148
Capital contributions from parent								425				425				43				43		45				45
Dividends and dividend equivalents		(572)				(572)
Dividends declared on common stock								$ (222)					(222)			$ (81)					(81)	$ (136)					(136)
Distributions to member														(161)
Other comprehensive income (loss)		$ (73)					(73)							2
Balance at end of period - shares at Jun. 30, 2018		699,128	699,128	[1]				66,368		66,368	[2]					21,294		21,294	[3]			37,818		37,818	[4]
Balance at end of period at Jun. 30, 2018		$ 11,240	$ 7		$ 10,462	$ 4,266	$ (3,495)	$ 4,418		$ 364		$ 3,154	$ 900			$ 2,611		$ 424		$ 1,755	$ 432	$ 3,414		$ 308		$ 2,661	$ 445	$ 0
Balance at end of period at Jun. 30, 2018														$ 4,632

[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.