Segment and Related Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012		Dec. 31, 2012
Income Statement Data
Revenues from external customers	$ 3,450		$ 2,549		$ 5,907		$ 6,661
Net Income Attributable to PPL Shareowners	405		271		818		812
Balance Sheet Data
Assets	43,746				43,746				43,634
Kentucky Regulated [Member]
Income Statement Data
Revenues from external customers	682		658		1,482		1,363
Net Income Attributable to PPL Shareowners	49		34		134		76
Balance Sheet Data
Assets	11,084				11,084				10,670
United Kingdom Regulated [Member]
Income Statement Data
Revenues from external customers	572		557		1,220		1,119
Net Income Attributable to PPL Shareowners	245	[1]	196	[1]	558	[1]	361	[1]
Balance Sheet Data
Assets	13,792				13,792				14,073
Pennsylvania Regulated [Member]
Income Statement Data
Revenues from external customers	413		403		925		860
Intersegment electric revenues	1		1		2		2
Net Income Attributable to PPL Shareowners	45		29		109		62
Balance Sheet Data
Assets	6,385				6,385				6,023
Supply [Member]
Income Statement Data
Revenues from external customers	1,780	[1]	931	[1]	2,274	[1]	3,319	[1]
Intersegment electric revenues	12		17		26		38
Net Income Attributable to PPL Shareowners	77	[1]	12	[1]	31	[1]	313	[1]
Balance Sheet Data
Assets	12,155				12,155				12,868
Corporate And Other [Member]
Income Statement Data
Revenues from external customers	3				6
Net Income Attributable to PPL Shareowners	(11)				(14)
Balance Sheet Data
Assets	$ 330	[2]			$ 330	[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.