Segment and Related Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011
Income Statement Data
Revenues from external customers	$ 2,403		$ 3,120		$ 9,064		$ 8,519
Net Income Attributable to PPL Shareowners	355		444		1,167		1,041
Balance Sheet Data
Assets	43,240				43,240				42,648
Kentucky Regulated [Member]
Income Statement Data
Revenues from external customers	732		736		2,095		2,140
Net Income Attributable to PPL Shareowners	72		78		148		184
Balance Sheet Data
Assets	10,546				10,546				10,229
UK Regulated [Member]
Income Statement Data
Revenues from external customers	528		493		1,647		1,138
Net Income Attributable to PPL Shareowners	202		138		563		231
Balance Sheet Data
Assets	14,015				14,015				13,364
Pennsylvania Regulated [Member]
Income Statement Data
Revenues from external customers	443		454		1,303		1,444
Intersegment electric revenues	1		1		3		9
Net Income Attributable to PPL Shareowners	33		28		95		116
Balance Sheet Data
Assets	5,823				5,823				5,610
Supply [Member]
Income Statement Data
Revenues from external customers	700	[1]	1,437	[1]	4,019	[1]	3,797	[1]
Intersegment electric revenues	23		5		61		15
Net Income Attributable to PPL Shareowners	48	[1]	200	[1]	361	[1]	510	[1]
Balance Sheet Data
Assets	$ 12,856				$ 12,856				$ 13,445

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