Retirement and Postemployment Benefits (Net Period Defined Benefit Costs (Credits) and Other Changes in Plan Assets and Benefit Obligations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended																																											2 Months Ended	12 Months Ended		2 Months Ended	12 Months Ended		10 Months Ended		2 Months Ended	12 Months Ended		2 Months Ended	12 Months Ended		10 Months Ended		2 Months Ended	12 Months Ended		10 Months Ended	2 Months Ended	12 Months Ended		10 Months Ended	2 Months Ended		12 Months Ended				10 Months Ended		2 Months Ended		12 Months Ended				10 Months Ended
	Dec. 31, 2012 Pension Benefits - US [Member]	Dec. 31, 2011 Pension Benefits - US [Member]	Dec. 31, 2010 Pension Benefits - US [Member]	Dec. 31, 2012 Pension Benefits - UK [Member]		Dec. 31, 2011 Pension Benefits - UK [Member]		Dec. 31, 2010 Pension Benefits - UK [Member]		Dec. 31, 2012 Other Postretirement Benefits - US [Member]	Dec. 31, 2011 Other Postretirement Benefits - US [Member]	Dec. 31, 2010 Other Postretirement Benefits - US [Member]	Dec. 31, 2012 PPL Energy Supply LLC [Member] Pension Benefits - US [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member] Pension Benefits - US [Member]	Dec. 31, 2010 PPL Energy Supply LLC [Member] Pension Benefits - US [Member]	Dec. 31, 2012 PPL Energy Supply LLC [Member] Pension Benefits - US [Member] PPL Services [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member] Pension Benefits - US [Member] PPL Services [Member]	Dec. 31, 2010 PPL Energy Supply LLC [Member] Pension Benefits - US [Member] PPL Services [Member]	Dec. 31, 2012 PPL Energy Supply LLC [Member] Pension Benefits - UK [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member] Pension Benefits - UK [Member]	Dec. 31, 2010 PPL Energy Supply LLC [Member] Pension Benefits - UK [Member]		Dec. 31, 2012 PPL Energy Supply LLC [Member] Other Postretirement Benefits - US [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member] Other Postretirement Benefits - US [Member]	Dec. 31, 2010 PPL Energy Supply LLC [Member] Other Postretirement Benefits - US [Member]	Dec. 31, 2012 PPL Energy Supply LLC [Member] Other Postretirement Benefits - US [Member] PPL Services [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member] Other Postretirement Benefits - US [Member] PPL Services [Member]	Dec. 31, 2010 PPL Energy Supply LLC [Member] Other Postretirement Benefits - US [Member] PPL Services [Member]	Dec. 31, 2012 PPL Electric Utilities Corp [Member] Pension Benefits - US [Member]		Dec. 31, 2011 PPL Electric Utilities Corp [Member] Pension Benefits - US [Member]		Dec. 31, 2010 PPL Electric Utilities Corp [Member] Pension Benefits - US [Member]		Dec. 31, 2012 PPL Electric Utilities Corp [Member] Pension Benefits - UK [Member]	Dec. 31, 2011 PPL Electric Utilities Corp [Member] Pension Benefits - UK [Member]	Dec. 31, 2010 PPL Electric Utilities Corp [Member] Pension Benefits - UK [Member]	Dec. 31, 2012 PPL Electric Utilities Corp [Member] Other Postretirement Benefits - US [Member]		Dec. 31, 2011 PPL Electric Utilities Corp [Member] Other Postretirement Benefits - US [Member]		Dec. 31, 2010 PPL Electric Utilities Corp [Member] Other Postretirement Benefits - US [Member]		Dec. 31, 2010 LG And E And KU Energy LLC [Member] Pension Benefits - US [Member] Successor [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] Pension Benefits - US [Member] Successor [Member]	Dec. 31, 2011 LG And E And KU Energy LLC [Member] Pension Benefits - US [Member] Successor [Member]	Dec. 31, 2010 LG And E And KU Energy LLC [Member] Pension Benefits - US [Member] Successor [Member] LKE [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] Pension Benefits - US [Member] Successor [Member] LKE [Member]	Dec. 31, 2011 LG And E And KU Energy LLC [Member] Pension Benefits - US [Member] Successor [Member] LKE [Member]	Oct. 31, 2010 LG And E And KU Energy LLC [Member] Pension Benefits - US [Member] Predecessor [Member]	Oct. 31, 2010 LG And E And KU Energy LLC [Member] Pension Benefits - US [Member] Predecessor [Member] LKE [Member]	Dec. 31, 2010 LG And E And KU Energy LLC [Member] Other Postretirement Benefits - US [Member] Successor [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] Other Postretirement Benefits - US [Member] Successor [Member]	Dec. 31, 2011 LG And E And KU Energy LLC [Member] Other Postretirement Benefits - US [Member] Successor [Member]	Dec. 31, 2010 LG And E And KU Energy LLC [Member] Other Postretirement Benefits - US [Member] Successor [Member] LKE [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] Other Postretirement Benefits - US [Member] Successor [Member] LKE [Member]	Dec. 31, 2011 LG And E And KU Energy LLC [Member] Other Postretirement Benefits - US [Member] Successor [Member] LKE [Member]	Oct. 31, 2010 LG And E And KU Energy LLC [Member] Other Postretirement Benefits - US [Member] Predecessor [Member]	Oct. 31, 2010 LG And E And KU Energy LLC [Member] Other Postretirement Benefits - US [Member] Predecessor [Member] LKE [Member]	Dec. 31, 2010 Louisville Gas And Electric Co [Member] Pension Benefits - US [Member] Successor [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member] Pension Benefits - US [Member] Successor [Member]	Dec. 31, 2011 Louisville Gas And Electric Co [Member] Pension Benefits - US [Member] Successor [Member]	Oct. 31, 2010 Louisville Gas And Electric Co [Member] Pension Benefits - US [Member] Predecessor [Member]	Dec. 31, 2010 Louisville Gas And Electric Co [Member] Other Postretirement Benefits - US [Member] Successor [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member] Other Postretirement Benefits - US [Member] Successor [Member]	Dec. 31, 2011 Louisville Gas And Electric Co [Member] Other Postretirement Benefits - US [Member] Successor [Member]	Oct. 31, 2010 Louisville Gas And Electric Co [Member] Other Postretirement Benefits - US [Member] Predecessor [Member]	Dec. 31, 2010 Kentucky Utilities Co [Member] Pension Benefits - US [Member] Successor [Member]		Dec. 31, 2012 Kentucky Utilities Co [Member] Pension Benefits - US [Member] Successor [Member]		Dec. 31, 2011 Kentucky Utilities Co [Member] Pension Benefits - US [Member] Successor [Member]		Oct. 31, 2010 Kentucky Utilities Co [Member] Pension Benefits - US [Member] Predecessor [Member]		Dec. 31, 2010 Kentucky Utilities Co [Member] Other Postretirement Benefits - US [Member] Successor [Member]		Dec. 31, 2012 Kentucky Utilities Co [Member] Other Postretirement Benefits - US [Member] Successor [Member]		Dec. 31, 2011 Kentucky Utilities Co [Member] Other Postretirement Benefits - US [Member] Successor [Member]		Oct. 31, 2010 Kentucky Utilities Co [Member] Other Postretirement Benefits - US [Member] Predecessor [Member]
Net Periodic Defined Benefit Costs (Credits): [ Abstract]
Service cost	$ 103	$ 95	$ 64	$ 54		$ 44		$ 17		$ 12	$ 12	$ 8	$ 6	$ 5	$ 4						$ 17	[1]	$ 1	$ 1	$ 1																			$ 4	$ 22	$ 24				$ 17		$ 1	$ 4	$ 4				$ 3				$ 2	$ 1
Interest cost	220	217	159	340		282		151		31	33	28	7	7	7						151	[1]	1	1	1																			11		67				54		1	9	10				9		2	14	14	12
Expected return on plan assets	(259)	(245)	(184)	(458)		(338)		(202)		(23)	(23)	(20)	(9)	(9)	(7)						(202)	[1]																						(9)	(70)	(64)				(45)			(4)	(3)				(2)		(3)	(19)	(18)	(13)
Amortization of:
Transition (asset) obligation										2	2	5																																									2	2				1
Prior service cost	24	24	21	4		4		4		1		4									4	[1]																						1	5	5				7			3	2				2		1	3	2	2
Actuarial (gain) loss	42	30	8	79		57		48		4	6	6	2	2	2						48	[1]																						5	22	24				16			(1)							2	11	11	6
Net periodic defined benefit costs (credits) prior to settlement charges and termination benefits	130	121	68	19		49		18		27	30	31	6	5	6						18	[1]	2	2	2
Settlement charges	11
Termination benefits				2	[2]	50	[2]
Net periodic defined benefit costs (credits)	141	121	68	21		99		18		27	30	31	6	5	6						18	[1]	2	2	2																			12	43	56				49		2	13	15				13		2	11	11	8
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract]
Settlements	(11)
Net (gain) loss	372	117	142	1,073		152		17		13	(9)	20	16	7	4						17	[1]		(2)																				(22)	96	29				96		(2)	(11)	(3)				3		(5)	18	15	18
Prior service costs (credit)		8								(1)	10	(71)											(1)																							8								11								9
Amortization of: [Abstract]
Transition (asset) obligation										(2)	(2)	(5)																																									(2)	(2)				(2)
Prior service cost	(24)	(24)	(21)	(4)		(4)		(4)		(1)		(4)									(4)	[1]																						(1)	(5)	(5)				(7)			(3)	(2)				(1)			(2)	(2)	(2)
Actuarial gain (loss)	(42)	(30)	(7)	(79)		(57)		(48)		(4)	(6)	(6)	(2)	(2)	(2)						(48)	[1]																						(5)	(22)	(24)				(16)			1							(2)	(11)	(11)	(6)
Acquisition of regulatory assets/liabilities: [Abstract]
Transition obligation												4
Prior service cost			31									6
Actuarial (gain) loss			303									(2)
Total recognized in OCI and regulatory assets/liabilities	295	71	448	990	[3]	91	[3]	(35)	[3]	5	(7)	(58)	14	5	2						(35)	[1]	(1)	(2)																				(28)	69	8				73		(2)	(15)	4						(7)	5	11	10
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities	436	192	516	1,011		190		(17)		32	23	(27)	20	10	8						(17)	[1]	1		2																			(16)	112	64				122			(2)	19				13		(5)	16	22	18
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract]
OCI	181	47	84							12	(6)	(40)																																(8)	34	1				32		(1)	(1)	2				(1)
Regulatory assets/liabilities	114	24	364							(7)	(1)	(18)																																(20)	35	7				41		(1)	(14)	2				1
Total recognized in OCI and regulatory assets/liabilities	295	71	448	990	[3]	91	[3]	(35)	[3]	5	(7)	(58)	14	5	2						(35)	[1]	(1)	(2)																				(28)	69	8				73		(2)	(15)	4						(7)	5	11	10
Estimated Amounts to be Amortized From AOCI and Regulatory Assets into Net Periodic Benefit Costs in the Next Fiscal Period (Details) [Abstract]
Prior service cost	22																																												5								3								2
Actuarial (gain) loss	78			154						6			3																																31								(1)								13
Total	100			154						6																																			36								2								15
Amortization from Balance Sheet: [Abstract]
AOCI	43			154						3
Regulatory assets/liabilities	57									3																																			36								2
Total	100			154						6																																			36								2								15
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract]
Net periodic defined benefit costs (credits) charged to operating expense, excluding amounts charged to construction and other non-expense accounts	119	98	59	25		82		16		22	24	27	37	27	24						16	[4]	6	7	12				19	[5]	14	[5]	12	[5]				3	[5]	4	[5]	8	[5]	9	31	40				37		2	9	11				9		3	13	16	12	1	5	5	4	2	[6]	8	[6]	10	[6]	8	[6]	1	[6]	3	[6]	4	[6]	3	[6]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors																$ 31	$ 23	$ 19								$ 5	$ 6	$ 10																			$ 1	$ 5	$ 7		$ 6				$ 1	$ 2	$ 5		$ 4

[1] In January 2011, PPL Energy Supply distributed its membership interest in PPL Global to PPL Energy Supply's parent. See Note 9 for additional information.

[2] Related to the WPD Midlands separations in the U.K.

[3] WPD is not subject to accounting for the effects of certain types of regulation as prescribed by GAAP. As a result, WPD does not record regulatory assets/liabilities.

[4] As a result of PPL Energy Supply's January 2011 distribution of its membership interest in PPL Global to its parent, PPL Energy Funding, these amounts are included in "Income (Loss) from Discontinued Operations (net of income taxes)" on PPL Energy Supply's Statements of Income. See Note 9 for additional information.

[5] PPL Electric does not directly sponsor any defined benefit plans. PPL Electric was allocated these costs of defined benefit plans sponsored by PPL Services, based on its participation in those plans, which management believes are reasonable.

[6] KU does not directly sponsor any defined benefit plans. KU was allocated these costs of defined benefit plans sponsored by LKE, based on its participation in those plans, which management believes are reasonable.