CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	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
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 PPL Energy Supply LLC [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member]	Dec. 31, 2010 PPL Energy Supply LLC [Member]	Dec. 31, 2012 PPL Electric Utilities Corp [Member]		Dec. 31, 2011 PPL Electric Utilities Corp [Member]		Dec. 31, 2010 PPL Electric Utilities Corp [Member]		Dec. 31, 2010 LG And E And KU Energy LLC [Member] Successor [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] Successor [Member]	Dec. 31, 2011 LG And E And KU Energy LLC [Member] Successor [Member]	Oct. 31, 2010 LG And E And KU Energy LLC [Member] Predecessor [Member]	Dec. 31, 2010 Louisville Gas And Electric Co [Member] Successor [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member] Successor [Member]	Dec. 31, 2011 Louisville Gas And Electric Co [Member] Successor [Member]	Oct. 31, 2010 Louisville Gas And Electric Co [Member] Predecessor [Member]	Dec. 31, 2010 Kentucky Utilities Co [Member] Successor [Member]	Dec. 31, 2012 Kentucky Utilities Co [Member] Successor [Member]	Dec. 31, 2011 Kentucky Utilities Co [Member] Successor [Member]	Oct. 31, 2010 Kentucky Utilities Co [Member] Predecessor [Member]
Cash Flows from Operating Activities
Net income	$ 1,531	$ 1,512	$ 959	$ 475	$ 769	$ 862	$ 136	[1]	$ 189	[1]	$ 135	[1]	$ 47	$ 219	$ 265	$ 190	$ 19	$ 123	$ 124	$ 109	$ 35	$ 137	$ 178	$ 140
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Pre-tax gain from the sale of the Maine hydroelectric generation business						(25)
Depreciation	1,100	961	567	285	245	365	160		146		136		49	346	334	235	23	152	147	115	26	193	186	119
Amortization	186	254	213	119	137	160	18		8		(23)		3	27	27		2	11	12		2	14	13
Defined benefit plans - expense	166	205	102	43	36	52	22		18		20		12	40	51	52	4	18	21	20	3	11	14	13
Deferred income taxes and investment tax credits	424	582	241	152	317	(31)	114		106		198		52	133	218	65	13	69	51	21	4	99	108	23
Impairment of assets	28	13	120	3	13	120								25								25
Unrealized (gains) losses on derivatives, and other hedging activities	27	(314)	542	(41)	(283)	536										14				14
Provision for Montana hydroelectric litigation		(74)	66		(74)	66
Regulatory asset for previously recorded losses on interest rate swaps																				(22)
Loss from discontinued operations - net of tax																1
Other	52	36	32	42	25	41	2		1		4		11	2	(9)	(23)	2	(13)	1	2	12	10	(10)	(3)
Change in current assets and current liabilities
Accounts receivable	7	(89)	(106)	(54)	38	(18)	3		(5)		(38)		(17)	(9)	17	12	(27)	(2)	25	(2)	(12)	(17)	22	13
Accounts payable	(29)	(36)	216	(45)	(89)	20	27		(68)		31		(14)	1	(32)	(34)	17		(24)		9	1	2	(17)
Accounts payable to affiliates													4	(1)		(7)	(31)	(3)	6	23	(41)		(12)	46
Unbilled revenues	(19)	64	(99)	33	14	(88)	(8)		36		59		(70)	(10)	24	41	(38)	(7)	16	22	(32)	(3)	8	19
Fuel, materials and supplies													15	8	15	(28)	10		20	(22)	5	7	(5)	(6)
Prepayments	(5)	294	(318)				2		58		(112)
Income tax receivable													(40)	2	37	(2)
Counterparty collateral	(34)	(190)	(18)	(34)	(190)	(18)
Taxes	24	(104)	20	(27)	27	87	12		(23)		(38)		4	1	(2)	18		(7)	3		14	15	(14)
Regulatory assets and liabilities	(2)	106	(110)				(1)		107		(85)
Accrued interest	32	109	50
Other	8	6	9	(68)	(18)	8	(5)		7		(27)		(27)		(1)	47	(2)	(7)	(7)	(47)	6	6	(3)	10
Other operating activities
Defined benefit plans - funding	(607)	(667)	(396)	(75)	(152)	(302)	(59)		(113)		(55)		(8)	(70)	(170)	(57)	(1)	(27)	(70)	(25)	(2)	(21)	(50)	(18)
Discontinued operations																13
Other assets	(33)	(62)	(45)	(41)	(30)	(71)	(3)		(28)		5		12	(5)	(11)	14		(21)	(7)	(5)		(3)	(2)	15
Other liabilities	(92)	(99)	(12)	17	(9)	76	(31)		(19)		2		(7)	38	18	(63)	1	22	7	(14)	1	26	9	(10)
Net cash provided by (used in) operating activities	2,764	2,507	2,033	784	776	1,840	389		420		212		26	747	781	488	(8)	308	325	189	30	500	444	344
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(3,105)	(2,487)	(1,597)	(648)	(661)	(1,009)	(624)		(481)		(401)		(152)	(768)	(477)	(447)	(65)	(286)	(196)	(155)	(89)	(480)	(279)	(292)
Proceeds from the sale of certain non-core generation facilities		381			381
Proceeds from the sale of the Long Island generation business			124			124
Proceeds from the sale of the Maine hydroelectric generation business			38			38
Proceeds from sales of discontinued operations																21
Proceeds from the sale of assets to affiliates																				48
Purchases of assets from affiliates																								(48)
Ironwood Acquisition, net of cash acquired	(84)			(84)
Acquisition of WPD Midlands		(5,763)
Acquisition of LKE, net of cash acquired			(6,812)
Expenditures for intangible assets				(45)	(57)	(82)
Purchases of nuclear plant decommissioning trust investments	(154)	(169)	(128)	(154)	(169)	(128)
Proceeds from the sale of nuclear plant decommissioning trust investments	139	156	114	139	156	114
Proceeds from the sale of other investments	20	163													163				163
Net (increase) decrease in notes receivable from affiliates				198	(198)								(61)	15	46
Net (increase) decrease in restricted cash and cash equivalents	96	(143)	85	104	(128)	84							2	(3)	(9)		2	(3)	(9)
Other investing activities	(35)	(90)	(53)	21	8	34	11		4		(2)
Net cash provided by (used in) investing activities	(3,123)	(7,952)	(8,229)	(469)	(668)	(825)	(613)		(477)		(403)		(211)	(756)	(277)	(426)	(63)	(289)	(42)	(107)	(89)	(480)	(279)	(340)
Cash Flows from Financing Activities
Borrowings during period on short-term facility													1,001			900					33
Retirement of short-term debt with affiliate													(1,001)			(575)					(33)
Issuance of long-term debt	1,223	5,745	4,642		500	602	249		645				2,890		250		531				1,489
Issuance of long-term debt with affiliates													1,783			50	485				1,298
Retirement of long-term debt	(108)	(1,210)	(20)	(9)	(750)				(458)						(2)
Retirement of long-term debt with affiliates													(1,783)			(325)	(485)				(1,298)
Issuance of common stock	72	2,297	2,441
Payment of common stock dividends	(833)	(746)	(566)
Contributions from parent							150		100		55
Redemption of preference stock of a subsidiary	(250)		(54)				(250)				(54)
Payment of common stock dividends to parent							(95)		(92)		(71)							(75)	(83)	(55)		(100)	(124)	(50)
Contributions from member				563	461	3,625							1,565
Repayment to E.ON AG affiliates													(4,319)				(485)				(1,331)
Distributions to member				(787)	(316)	(4,692)							(100)	(155)	(533)	(87)
Cash included in net assets of subsidiary distributed to member					(325)
Debt issuance and credit facility costs	(17)	(102)	(175)	(3)	(9)	(53)							(32)	(2)	(8)		(10)	(2)	(2)		(17)		(3)
Contract adjustment payments	(94)	(72)	(13)
Net increase (decrease) in notes payable to affiliates														25		(3)	(130)		(12)	(28)	(83)		(10)	48
Net increase (decrease) in short-term debt	74	(125)	70	(44)	50	(93)							163	125	(163)		163	55	(163)			70
Other financing activities	(19)	(20)	(18)	(1)	(1)	(1)	(10)		(22)		(20)
Net cash provided by (used in) financing activities	48	5,767	6,307	(281)	(390)	(612)	44		173		(90)		167	(7)	(456)	(40)	69	(22)	(260)	(83)	58	(30)	(137)	(2)
Effect of Exchange Rates on Cash and Cash Equivalents	10	(45)	13			13
Net Increase (Decrease) in Cash and Cash Equivalents	(301)	277	124	34	(282)	416	(180)		116		(281)		(18)	(16)	48	22	(2)	(3)	23	(1)	(1)	(10)	28	2
Cash and Cash Equivalents at Beginning of Period	1,202	925	801	379	661	245	320		204		485		29	59	11	7	4	25	2	5	4	31	3	2
Cash and Cash Equivalents at End of Period	901	1,202	925	413	379	661	140		320		204		11	43	59	29	2	22	25	4	3	21	31	4
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized	847	696	458	150	165	275	81		75		87		41	139	126	153	11	39	40	39	22	62	60	62
Income taxes - net	$ 73	$ (76)	$ 313	$ 128	$ 69	$ 278	$ (42)		$ (44)		$ (33)		$ (1)	$ (45)	$ (98)	$ 9	$ (8)	$ 5	$ 20	$ 60	$ (12)	$ (39)	$ 16	$ 74

[1] Net income approximates comprehensive income.