CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income		$ 1,128	$ 1,902	$ 682
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Foreign currency translation adjustments, net of tax		538	(1,107)	(234)
Available-for-sale securities, net of tax		0	0	8
Qualifying derivatives, net of tax		(79)	91	26
Defined benefit plans:
Prior service costs, net of tax		0	(3)	(9)
Net actuarial gain (loss), net of tax		(308)	(61)	(366)
Reclassifications to net income - (gains) losses, net of tax expense (benefit):
Available-for-sale securities, net of tax		0	0	(2)
Qualifying derivatives, net of tax		73	(91)	2
Equity investees' other comprehensive (income) loss, net of tax		1	(1)	(1)
Defined benefit plans:
Prior service costs, net of tax		1	1	0
Net actuarial (gain) loss, net of tax		130	121	146
Total other comprehensive income (loss)		356	(1,050)	(430)
Comprehensive income		1,484	852	252
PPL Electric Utilities Corp [Member]
Net income	[1]	362	340	252
LG And E And KU Energy LLC [Member]
Net income		316	429	364
Defined benefit plans:
Prior service costs, net of tax		(2)	0	(3)
Net actuarial gain (loss), net of tax		(23)	(27)	(4)
Reclassifications to net income - (gains) losses, net of tax expense (benefit):
Equity investees' other comprehensive (income) loss, net of tax		1	(1)	0
Defined benefit plans:
Prior service costs, net of tax		1	2	1
Net actuarial (gain) loss, net of tax		5	2	5
Total other comprehensive income (loss)		(18)	(24)	(1)
Comprehensive income		298	405	363
Louisville Gas And Electric Co [Member]
Net income	[2]	213	203	185
Kentucky Utilities Co [Member]
Net income	[3]	259	265	$ 234
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.