Segment and Related Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Income Statement Data
Revenues	$ 2,874		$ 3,450		$ 4,097		$ 5,907
Net Income Attributable to PPL Shareowners	229		405		545		818
Balance Sheet Data
Assets	48,193				48,193				46,259
United Kingdom Regulated [Member]
Income Statement Data
Revenues	672		572		1,320		1,220
Net Income Attributable to PPL Shareowners	187	[1]	245	[1]	393	[1]	558	[1]
Balance Sheet Data
Assets	16,496				16,496				15,895
Kentucky Regulated [Member]
Income Statement Data
Revenues	722		682		1,656		1,482
Net Income Attributable to PPL Shareowners	58		49		165		134
Balance Sheet Data
Assets	12,211				12,211				12,016
Pennsylvania Regulated [Member]
Income Statement Data
Revenues	448		413		1,039		925
Net Income Attributable to PPL Shareowners	52		45		137		109
Balance Sheet Data
Assets	7,252				7,252				6,846
Supply [Member]
Income Statement Data
Revenues	1,027	[1]	1,780	[1]	74	[1]	2,274	[1]
Net Income Attributable to PPL Shareowners	5	[1]	77	[1]	(70)	[1]	31	[1]
Balance Sheet Data
Assets	11,793				11,793				11,408
Corporate And Other [Member]
Income Statement Data
Revenues	5		3		8		6
Net Income Attributable to PPL Shareowners	(73)	[2]	(11)		(80)	[2]	(14)
Balance Sheet Data
Assets	441	[3]			441	[3]			94	[3]
Intersegment Eliminations [Member] | Supply [Member]
Income Statement Data
Revenues	$ (21)		$ (12)		$ (48)		$ (26)

[1] Includes unrealized gains and losses from economic activity. See Note 14 for additional information.

[2] 2014 includes certain costs related to the anticipated spinoff of PPL Energy Supply, including deferred income tax expense and third party costs. See Note 8 for additional information.

[3] Primarily consists of unallocated items, including cash, PP&E and the elimination of inter-segment transactions.