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, 2015			673,857	[1]						66,368	[2]						21,294	[3]					37,818	[4]
Balance at beginning of period at Dec. 31, 2015		$ 9,919	$ 7		$ 9,687	$ 2,953	$ (2,728)	$ 3,119		$ 364		$ 1,934	$ 821		$ 2,330		$ 424		$ 1,611	$ 295	$ 3,287		$ 308		$ 2,596	$ 383	$ 0
Balance at beginning of period at Dec. 31, 2015														$ 4,517
Common stock shares issued	[1]		5,411
Common stock issued		168			168
Stock-based compensation		(31)			(31)
Net Income		1,437				1,437		263	[5]				263	337	159	[5]				159	207	[6]				207
Contributions from member														37
Capital contributions from parent								200				200			47				47		20				20
Dividends and dividend equivalents		(773)				(773)
Dividends declared on common stock								(193)					(193)		(87)					(87)	(197)					(197)
Distributions to member														(224)
Other comprehensive income (loss)		(752)					(752)							4							(1)						(1)
Adoption of stock-based compensation guidance cumulative effect adjustment		7				7
Balance at end of period - shares at Sep. 30, 2016			679,268	[1]						66,368	[2]						21,294	[3]					37,818	[4]
Balance at end of period at Sep. 30, 2016		$ 9,975	$ 7		9,824	3,624	(3,480)	$ 3,389		$ 364		2,134	891		$ 2,449		$ 424		1,658	367	$ 3,316		$ 308		2,616	393	(1)
Balance at end of period at Sep. 30, 2016														4,671
Balance at beginning of period - shares at Dec. 31, 2016		679,731	679,731	[1]				66,368		66,368	[2]				21,294		21,294	[3]			37,818		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]		8,402
Common stock issued		303			303
Stock-based compensation		(22)			(22)
Net Income		1,050				1,050		251	[5]				251	322	161	[5]				161	196	[6]				196
Capital contributions from parent								575				575
Dividends and dividend equivalents		(813)				(813)
Dividends declared on common stock								$ (231)					(231)		$ (150)					(150)	(171)					(171)
Distributions to member														(316)
Other comprehensive income (loss)		$ 275					275							(7)							$ 1						1
Balance at end of period - shares at Sep. 30, 2017		688,133	688,133	[1]				66,368		66,368	[2]				21,294		21,294	[3]			37,818		37,818	[4]
Balance at end of period at Sep. 30, 2017		$ 10,692	$ 7		$ 10,122	$ 4,066	$ (3,503)	$ 3,986		$ 364		$ 2,729	$ 893		$ 2,487		$ 424		$ 1,682	$ 381	$ 3,349		$ 308		$ 2,616	$ 425	$ 0
Balance at end of period at Sep. 30, 2017														$ 4,666

[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.