Goodwill and Other Intangible Assets (Goodwill) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended										12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2013 Kentucky Regulated [Member]		Dec. 31, 2012 Kentucky Regulated [Member]		Dec. 31, 2011 Kentucky Regulated [Member]		Dec. 31, 2013 United Kingdom Regulated [Member]		Dec. 31, 2012 United Kingdom Regulated [Member]		Dec. 31, 2013 Supply [Member]		Dec. 31, 2012 Supply [Member]		Dec. 31, 2011 Supply [Member]		Dec. 31, 2013 PPL Energy Supply LLC [Member]	Dec. 31, 2012 PPL Energy Supply LLC [Member]	Dec. 31, 2013 LG And E And KU Energy LLC [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member]	Dec. 31, 2013 Louisville Gas And Electric Co [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member]	Dec. 31, 2013 Kentucky Utilities Co [Member]	Dec. 31, 2012 Kentucky Utilities Co [Member]
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward]
Balance at beginning of period	$ 4,158		$ 4,114	[1]	$ 662	[1]	$ 662	[1]	$ 662	[1]	$ 3,076	[1]	$ 3,032	[1]	$ 420	[1]	$ 420	[1]	$ 420	[1]	$ 86	$ 86	$ 996	$ 996	$ 389	$ 389	$ 607	$ 607
Changes during the period	67	[2]	44	[2]							67	[2]	44	[2]
Balance at end of period	$ 4,225		$ 4,158		$ 662	[1]	$ 662	[1]	$ 662	[1]	$ 3,143	[1]	$ 3,076	[1]	$ 420	[1]	$ 420	[1]	$ 420	[1]	$ 86	$ 86	$ 996	$ 996	$ 389	$ 389	$ 607	$ 607

[1] There were no accumulated impairment losses related to goodwill.

[2] Primarily the effect of foreign currency exchange rates.