Segment and Related Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Income Statement Data
Revenues	$ 1,223		$ 2,457
Net Income Attributable to PPL Shareowners	316		413
Balance Sheet Data
Assets	47,973				46,259
United Kingdom Regulated [Member]
Income Statement Data
Revenues	648		648
Net Income Attributable to PPL Shareowners	206		313
Balance Sheet Data
Assets	16,535				15,895
Kentucky Regulated [Member]
Income Statement Data
Revenues	934		800
Net Income Attributable to PPL Shareowners	107		85
Balance Sheet Data
Assets	12,037				12,016
Pennsylvania Regulated [Member]
Income Statement Data
Revenues	591		512
Net Income Attributable to PPL Shareowners	85		64
Balance Sheet Data
Assets	7,022				6,846
Supply [Member]
Income Statement Data
Revenues	(953)	[1]	494	[1]
Net Income Attributable to PPL Shareowners	(75)	[1]	(46)	[1]
Balance Sheet Data
Assets	12,237				11,408
Corporate And Other [Member]
Income Statement Data
Revenues	3		3
Net Income Attributable to PPL Shareowners	(7)		(3)
Balance Sheet Data
Assets	142	[2]			94	[2]
Intersegment Eliminations [Member] | Supply [Member]
Income Statement Data
Revenues	$ (27)		$ (14)

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

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