Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended											12 Months Ended									12 Months Ended											12 Months Ended			2 Months Ended	12 Months Ended		10 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Certain Non-Core Generation Facilities [Member]		Dec. 31, 2010 Certain Non-Core Generation Facilities [Member]		Dec. 31, 2010 Maine Hydroelectric Generation Business [Member] Integer	Dec. 31, 2009 Maine Hydroelectric Generation Business [Member]	Dec. 31, 2010 PPL Global [Member]	Dec. 31, 2009 Western Kentucky Energy Corp Lease [Member] Integer	Dec. 31, 2012 PPL Energy Supply LLC [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member]	Dec. 31, 2010 PPL Energy Supply LLC [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member] Certain Non-Core Generation Facilities [Member]		Dec. 31, 2010 PPL Energy Supply LLC [Member] Certain Non-Core Generation Facilities [Member]		Dec. 31, 2010 PPL Energy Supply LLC [Member] Maine Hydroelectric Generation Business [Member] Integer	Dec. 31, 2009 PPL Energy Supply LLC [Member] Maine Hydroelectric Generation Business [Member]	Dec. 31, 2010 PPL Energy Supply LLC [Member] PPL Global [Member]		Dec. 31, 2009 LG And E And KU Energy LLC [Member] Western Kentucky Energy Corp Lease [Member] Integer	Dec. 31, 2010 LG And E And KU Energy LLC [Member] Successor [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] Successor [Member]	Dec. 31, 2011 LG And E And KU Energy LLC [Member] Successor [Member]	Oct. 31, 2010 LG And E And KU Energy LLC [Member] Predecessor [Member]
Discontinued Operations (Numeric) [Abstract]
Proceeds from the sale of certain non-core generation facilities													$ 381											$ 381
Initial pre-tax impairment charge																	96											96
Initial after-tax impairment charge																	58											58
Goodwill allocated to an asset or group of assets and written off, pre-tax																	5											5
Goodwill allocated to an asset or group of assets and written off, after-tax																	4											4
Proceeds from the sale of the Long Island generation business														124											124
Number of fully owned hydroelectric facilities sold in 2009 and 2010																			8											8
Number of remaining fully owned hydroelectric facilities sold in 2010																			3											3
Ownership percentage in a Maine hydroelectric facility sold																				50.00%											50.00%
Proceeds from the sale of the remaining Maine hydroelectric facilities																			24											24
Contingent consideration received																			14											14
Gain (loss) on the sale of discontinued operations																			25											25
Gain (loss) on the sale of discontinued operations, net of tax																			15											15
Term of lease to operate generating facilities (in years)																						25												25
Discontinued Operations (Details) [Abstract]
Operating revenues															19		113									19		113				761
Operating expenses															11		156	[1]								11		156	[1]			368
Operating income															8		(43)									8		(43)				393
Other income (expense) - net																	2											2				4
Interest expense															3	[2]	11	[2]								3	[2]	11	[2]			135	[3]
Income (loss) before income taxes															5		(52)									5		(52)				262
Income tax expense (benefit)												(4)	2	(6)	3		(18)							3	(5)	3		(18)				1			1	(4)	(1)	(1)
Income (Loss) from Discontinued Operations			$ (6)	[4]				$ (1)	[4]	$ 3	[4]	$ (6)	$ 2	$ (17)	$ 2		$ (34)				$ 261			$ 2	$ 242	$ 2		$ (34)							$ 2	$ (6)	$ (1)	$ (1)

[1] 2010 includes the impairments to the carrying value of the non-core generation facilities and the write-off of allocated goodwill.

[2] Represents allocated interest expense based upon debt attributable to the generation facilities sold.

[3] No interest was allocated, as PPL Global was sufficiently capitalized.

[4] Quarterly results can vary depending on, among other things, weather and the forward pricing of power. Accordingly, comparisons among quarters of a year may not be indicative of overall trends and changes in operations.