CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income		$ 1,902	$ 682	$ 1,737
Defined benefit plans:
Total other comprehensive income (loss)		(1,050)	(430)	(709)
Comprehensive income (loss)		852	252	1,028
PPL Electric Utilities Corp [Member]
Net income	[1]	340	252	263
LG And E And KU Energy LLC [Member]
Net income		429	364	344
Defined benefit plans:
Prior service costs, net of tax		0	(3)	(7)
Net actuarial gain (loss), net of tax		(27)	(4)	(50)
Reclassifications to net income - (gains) losses, net of tax expense (benefit):
Equity investees' other comprehensive (income) loss, net of tax		(1)	0	(1)
Defined benefit plans:
Prior service costs, net of tax		2	1	1
Net actuarial (gain) loss, net of tax		2	5	(1)
Total other comprehensive income (loss)		(24)	(1)	(58)
Comprehensive income (loss)		405	363	286
Louisville Gas And Electric Co [Member]
Net income	[2]	203	185	169
Kentucky Utilities Co [Member]
Net income	[3]	265	$ 234	220
Defined benefit plans:
Total other comprehensive income (loss)		$ (1)		$ (1)

[1] Net income equals comprehensive income.

[2] Net income equals comprehensive income.

[3] Net income approximates comprehensive income.