Segment and Related Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Income Statement Data
Revenues	$ 3,449		$ 3,074		$ 7,476		$ 8,902
Net Income Attributable to PPL Shareowners	497		410		1,042		1,228
Balance Sheet Data
Assets	48,189				48,189				46,259
United Kingdom Regulated [Member]
Income Statement Data
Revenues	644		543		1,964		1,763
Net Income Attributable to PPL Shareowners	295	[1]	183	[1]	688	[1]	741	[1]
Balance Sheet Data
Assets	16,543				16,543				15,895
Kentucky Regulated [Member]
Income Statement Data
Revenues	753		744		2,409		2,226
Net Income Attributable to PPL Shareowners	82		93		247		227
Balance Sheet Data
Assets	12,493				12,493				12,016
Pennsylvania Regulated [Member]
Income Statement Data
Revenues	477		463		1,516		1,388
Net Income Attributable to PPL Shareowners	57		51		194		160
Balance Sheet Data
Assets	7,355				7,355				6,846
Supply [Member]
Income Statement Data
Revenues	1,571	[1]	1,321	[1]	1,575	[1]	3,516	[1]
Net Income Attributable to PPL Shareowners	86	[1]	91	[1]	16	[1]	122	[1]
Balance Sheet Data
Assets	11,210				11,210				11,408
Corporate And Other [Member]
Income Statement Data
Revenues	4		3		12		9
Net Income Attributable to PPL Shareowners	(23)	[2]	(8)		(103)	[2]	(22)
Balance Sheet Data
Assets	588	[3]			588	[3]			94	[3]
Intersegment Eliminations [Member] | Supply [Member]
Income Statement Data
Revenues	$ (20)		$ (11)		$ (68)		$ (37)

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

[2] 2014 includes certain costs related to the anticipated spinoff of PPL Energy Supply, including deferred income tax expense, third party transaction costs, and separation benefits. See Note 8 for additional information.

[3] Primarily consists of unallocated items, including cash, PP&E and the elimination of inter-segment transactions.