Segment and Related Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Income Statement Data
Revenues	$ 3,105		$ 2,403		$ 9,012		$ 9,064
Net Income Attributable to PPL Shareowners	410		355		1,228		1,167
Balance Sheet Data
Assets	44,988				44,988				43,634
United Kingdom Regulated [Member]
Income Statement Data
Revenues	543		528		1,763		1,647
Net Income Attributable to PPL Shareowners	183	[1]	202	[1]	741	[1]	563	[1]
Balance Sheet Data
Assets	14,329				14,329				14,073
Kentucky Regulated [Member]
Income Statement Data
Revenues	744		732		2,226		2,095
Net Income Attributable to PPL Shareowners	93		72		227		148
Balance Sheet Data
Assets	11,368				11,368				10,670
Pennsylvania Regulated [Member]
Income Statement Data
Revenues	463		443		1,388		1,303
Net Income Attributable to PPL Shareowners	51		33		160		95
Balance Sheet Data
Assets	6,729				6,729				6,023
Supply [Member]
Income Statement Data
Revenues	1,352	[1]	700	[1]	3,626	[1]	4,019	[1]
Net Income Attributable to PPL Shareowners	91	[1]	48	[1]	122	[1]	361	[1]
Balance Sheet Data
Assets	12,198				12,198				12,868
Corporate And Other [Member]
Income Statement Data
Revenues	3				9
Net Income Attributable to PPL Shareowners	(8)				(22)
Balance Sheet Data
Assets	364	[2]			364	[2]
Intersegment Eliminations [Member] | Pennsylvania Regulated [Member]
Income Statement Data
Revenues	(1)		(1)		(3)		(3)
Intersegment Eliminations [Member] | Supply [Member]
Income Statement Data
Revenues	$ (11)		$ (23)		$ (37)		$ (61)

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

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