Other Income (Expense) - net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011		Jun. 30, 2012	Jun. 30, 2011
Other Income [Line Items]
Other income	$ 10	$ 74		$ 21	$ 88
Other Expense [Line Items]
Other expense	(20)	108		8	127
Other Income (Expense) - net	30	(34)		13	(39)
Economic Foreign Currency Exchange Contracts [Member]
Other Expense [Line Items]
Other expense	(25)	(2)		(7)	0
Charitable Contributions [Member]
Other Expense [Line Items]
Other expense	2	2		6	5
WPD Midlands Acquisition Related Costs [Member]
Other Expense [Line Items]
Other expense	0	26		0	36
Foreign Currency Loss On 2011 Bridge Facility [Member]
Other Expense [Line Items]
Other expense	0	58	[1]	0	58	[1]
UK Stamp Duty Tax [Member]
Other Expense [Line Items]
Other expense	0	21		0	21
Miscellaneous Domestic Other Expense [Member]
Other Expense [Line Items]
Other expense	4	1		8	4
Miscellaneous UK Other Expense [Member]
Other Expense [Line Items]
Other expense	(1)	2		1	3
Earnings On Securities In Nuclear Decommissioning Trust Funds [Member]
Other Income [Line Items]
Other income	4	3		12	18
Interest Income [Member]
Other Income [Line Items]
Other income	2	2		3	4
Allowance For Funds Used During Construction [Member]
Other Income [Line Items]
Other income	3	2		5	3
Net Hedge Gains Associated With 2011 Bridge Facility [Member]
Other Income [Line Items]
Other income	0	62	[2]	0	55	[2]
Equity Earnings (Losses) From Unconsolidated Affiliates [Member]
Other Income [Line Items]
Other income	(4)	0		(6)	0
Miscellaneous Domestic Other Income [Member]
Other Income [Line Items]
Other income	3	4		5	7
Miscellaneous UK Other Income [Member]
Other Income [Line Items]
Other income	2	1		2	1
PPL Energy Supply LLC [Member]
Other Income [Line Items]
Other income	6	6		15	23
Other Expense [Line Items]
Other expense	1	2		5	5
Other Income (Expense) - net	5	4		10	18
PPL Energy Supply LLC [Member] | Charitable Contributions [Member]
Other Expense [Line Items]
Other expense	0	0		1	0
PPL Energy Supply LLC [Member] | Miscellaneous Domestic Other Expense [Member]
Other Expense [Line Items]
Other expense	1	2		4	5
PPL Energy Supply LLC [Member] | Earnings On Securities In Nuclear Decommissioning Trust Funds [Member]
Other Income [Line Items]
Other income	4	3		12	18
PPL Energy Supply LLC [Member] | Interest Income [Member]
Other Income [Line Items]
Other income	1	2		1	2
PPL Energy Supply LLC [Member] | Miscellaneous Domestic Other Income [Member]
Other Income [Line Items]
Other income	1	1		2	3
PPL Electric Utilities Corp [Member]
Other Expense [Line Items]
Other Income (Expense) - net	1	1		3	1
LG And E And KU Energy LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(7)	0		(10)	(1)
Louisville Gas And Electric Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(1)	1		0	0
Kentucky Utilities Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	$ (5)	$ 0		$ (6)	$ 1

[1] Represents a foreign currency loss related to the repayment of the 2011 Bridge Facility borrowing.

[2] Represents a gain on foreign currency contracts that hedged the repayment of the 2011 Bridge Facility borrowing.