Segment and Related Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012
Income Statement Data
Revenues from external customers	$ 2,457		$ 4,112
Net Income Attributable to PPL Shareowners	413		541
Balance Sheet Data
Assets	43,341				43,634
Kentucky Regulated [Member]
Income Statement Data
Revenues from external customers	800		705
Net Income Attributable to PPL Shareowners	85		42
Balance Sheet Data
Assets	10,870				10,670
United Kingdom Regulated [Member]
Income Statement Data
Revenues from external customers	648		562
Net Income Attributable to PPL Shareowners	313		165
Balance Sheet Data
Assets	13,816				14,073
Pennsylvania Regulated [Member]
Income Statement Data
Revenues from external customers	512		457
Intersegment electric revenues	1		1
Net Income Attributable to PPL Shareowners	64		33
Balance Sheet Data
Assets	6,267				6,023
Supply [Member]
Income Statement Data
Revenues from external customers	494	[1]	2,388	[1]
Intersegment electric revenues	14		21
Net Income Attributable to PPL Shareowners	(46)	[1]	301	[1]
Balance Sheet Data
Assets	12,041				12,868
Corporate And Other [Member]
Income Statement Data
Revenues from external customers	3
Net Income Attributable to PPL Shareowners	(3)
Balance Sheet Data
Assets	$ 347	[2]

[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.