CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended									2 Months Ended	12 Months Ended	10 Months Ended	12 Months Ended	2 Months Ended	12 Months Ended	10 Months Ended	12 Months Ended	2 Months Ended	12 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 PPL Energy Supply [Member]	Dec. 31, 2010 PPL Energy Supply [Member]	Dec. 31, 2009 PPL Energy Supply [Member]	Dec. 31, 2011 PPL Electric [Member]	Dec. 31, 2010 PPL Electric [Member]	Dec. 31, 2009 PPL Electric [Member]	Dec. 31, 2010 LKE [Member] Successor [Member]	Dec. 31, 2011 LKE [Member] Successor [Member]	Oct. 31, 2010 LKE [Member] Predecessor [Member]	Dec. 31, 2009 LKE [Member] Predecessor [Member]	Dec. 31, 2010 LGE [Member] Successor [Member]	Dec. 31, 2011 LGE [Member] Successor [Member]	Oct. 31, 2010 LGE [Member] Predecessor [Member]	Dec. 31, 2009 LGE [Member] Predecessor [Member]	Dec. 31, 2010 KU [Member] Successor [Member]	Dec. 31, 2011 KU [Member] Successor [Member]	Oct. 31, 2010 KU [Member] Predecessor [Member]	Dec. 31, 2009 KU [Member] Predecessor [Member]
Cash Flows from Operating Activities
Net income	$ 1,512	$ 959	$ 426	$ 769	$ 862	$ 247	$ 189	$ 135	$ 142	$ 47	$ 265	$ 190	$ (1,537)	$ 19	$ 124	$ 109	$ 95	$ 35	$ 178	$ 140	$ 133
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Pre-tax gain from the sale of the majority of Maine hydroelectric generation business	0	(25)	(38)	0	(25)	(38)
Depreciation	961	567	471	245	365	327	146	136	128	49	334	235	271	23	147	115	136	26	186	119	133
Amortization	254	213	389	137	160	75	8	(23)	324	3	18	0	0
Defined benefit plans - expense	205	102	70	36	52	23	18	20	24	12	51	52	83	4	21	20	33	3	14	13	26
Deferred income taxes and investment tax credits	582	241	104	317	(31)	141	106	198	(22)	52	218	65	43	13	51	21	15	4	108	23	74
Impairment of assets	13	120	127	13	120	123
Unrealized (gains) losses on derivatives, and other hedging activities	(314)	542	329	(283)	536	330				0	0	14	(33)	0	0	14	(33)
Provision for Montana hydroelectric litigation	(74)	66	8	(74)	66	8
Regulatory asset for previously recorded losses on interest rate swaps														0	0	(22)	0
Loss from discontinued operations - net of tax												1	225
Loss on impairment of goodwill										0	0	0	1,493
Other	36	57	13	25	41	14	1	4	0	11	(1)	(23)	8	5	13	2	(3)	14	3	(3)	0
Change in current assets and current liabilities
Accounts receivable	(89)	(100)	76	38	(18)	77	(5)	(32)	1	(17)	18	12	69	(27)	26	(2)	38	(12)	22	13	11
Accounts payable	(36)	216	(150)	(89)	20	(178)	(68)	31	(9)	(14)	(31)	(34)	(44)	17	(24)	0	37	9	2	(17)	(32)
Accounts payable to affiliates										4	(1)	(7)	(20)	(31)	6	23	(52)	(41)	(12)	46	29
Unbilled revenue	64	(100)	6	14	(88)	9	36	58	(3)	(70)	24	41	4	(38)	16	22	18	(32)	8	19	(15)
Collateral on PLR energy supply to affiliate				0	0	300
Fuel, materials and supplies										15	16	(28)	31	10	20	(22)	45	5	(4)	(6)	(28)
Prepayments	294	(318)	(17)				58	(112)	(17)
Income tax receivable										(40)	37	(2)	0
Counterparty collateral	(190)	(18)	334	(190)	(18)	334
Price risk management assets and liabilities	2	(24)	(231)	3	(27)	(223)
Taxes	(104)	20	(3)	27	87	(16)	(23)	(38)	(4)	4	(2)	18	(76)
Collateral on PLR energy supply from affiliate							0	0	(300)
Regulatory assets and liabilities, net	106	(110)	31				107	(85)	31
Accrued interest	109	50	(20)
Other	4	28	80	(21)	35	7	7	(32)	26	(27)	4	47	6	(2)	(1)	(47)	39	21	(16)	10	2
Other operating activities
Defined benefit plans - funding	(667)	(396)	(185)	(152)	(302)	(136)	(113)	(55)	(28)	(8)	(170)	(57)	(51)	(1)	(70)	(25)	(15)	(2)	(50)	(18)	(20)
Storm restoration regulatory asset										0	0	0	(101)	0	0	0	(44)	0	0	0	(57)
Discontinued operations										0	0	13	(655)
Other assets	(62)	(45)	12	(30)	(71)	15	(28)	5	(3)	12	(8)	14	53	0	(7)	(5)	60	0	(1)	15	(22)
Other liabilities	(99)	(12)	20	(9)	76	(26)	(19)	2	4	(7)	(3)	(63)	27	0	(1)	(14)	(60)	(1)	0	(10)	19
Net cash provided by (used in) operating activities	2,507	2,033	1,852	776	1,840	1,413	420	212	294	26	769	488	(204)	(8)	321	189	309	29	438	344	253
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(2,487)	(1,597)	(1,225)	(661)	(1,009)	(907)	(481)	(401)	(288)	(152)	(465)	(447)	(703)	(65)	(192)	(155)	(186)	(88)	(273)	(292)	(516)
Expenditures for property, plant and equipment - discontinued operations										0	0	0	(23)
Proceeds from the sale of certain non-core generation facilities	381	0	0	381	0	0
Proceeds from the sale of Long Island generation business	0	124	0	0	124	0
Proceeds from the sale of the majority of Maine hydroelectric generation business	0	38	81	0	38	81
Proceeds from sales of discontinued operations										0	0	21	0
Proceeds from the sale of assets to affiliates														0	0	48	0
Purchases of assets from affiliates																		0	0	(48)	0
Acquisition of WPD Midlands	(5,763)	0	0
Acquisition of LKE, net of cash acquired	0	(6,812)	0
Expenditures for intangible assets				(57)	(82)	(78)	(9)	(10)	(10)
Purchases of nuclear plant decommissioning trust investments	(169)	(128)	(227)	(169)	(128)	(227)
Proceeds from the sale of nuclear plant decommissioning trust investments	156	114	201	156	114	201
Proceeds from the sale of other investments	163	0	154	0	0	154				0	163	0	0	0	163	0	0
Issuance of long-term notes receivable to affiliates				0	(1,816)	0
Repayment of long-term notes receivable from affiliates				0	1,816	0
Net (increase) decrease in notes receivable from affiliates				(198)	0	0	0	0	300	(61)	46	0	0
Net (increase) decrease in restricted cash and cash equivalents	(143)	85	218	(128)	84	219				2	(9)	0	10	2	(9)	0	0	0	0	0	9
Other investing activities	(90)	(53)	(82)	8	34	6	13	8	4	0	0	0	10	0	0	0	10
Net cash provided by (used in) investing activities	(7,952)	(8,229)	(880)	(668)	(825)	(551)	(477)	(403)	6	(211)	(265)	(426)	(706)	(63)	(38)	(107)	(176)	(88)	(273)	(340)	(507)
Cash Flows from Financing Activities
Issuance of short-term debt with affiliates										1,001	0	900	505					33	0	0	0
Retirement of short-term debt with affiliate										(1,001)	0	(575)	0					(33)	0	0	0
Issuance of long-term debt	5,745	4,642	298	500	602	0	645	0	298	2,890	250	0	0	531	0	0	0	1,489	0	0	0
Issuance of long-term debt with affiliates										1,783	0	50	725	485	0	0	0	1,298	0	0	150
Retirement of long-term debt	(1,210)	(20)	(1,016)	(750)	0	(220)	(458)	0	(595)	0	(2)	0	0
Retirement of long-term debt with affiliates			0							(1,783)	0	(325)	(255)	(485)	0	0		(1,298)	0	0	0
Issuance of common stock	2,297	2,441	60
Payment of common stock dividends	(746)	(566)	(517)
Payment of common stock dividends to parent							(92)	(71)	(274)					0	(83)	(55)	(80)	0	(124)	(50)	0
Contributions from parent							100	55	400
Redemption of preferred stock							0	(54)	0
Redemption of preferred stock of a subsidiary	0	(54)	0
Debt issuance and credit facility costs	(102)	(175)	(21)							(32)	(8)	0	0	(10)	(2)	0	0	(17)	(3)	0	0
Contributions from member				461	3,625	50				1,565	0	0	0					0	0	0	75
Repayment to E.ON AG affiliates										(4,319)	0	0	0	(485)	0	0	0	(1,331)	0	0	0
Distributions to member				(316)	(4,692)	(943)				(100)	(533)	(87)	(49)
Cash included in net assets of subsidiary distributed to member				(325)	0	0
Net increase (decrease) in note payable to affiliates										0	0	(3)	(22)	(130)	(12)	(28)	(52)	(83)	(10)	48	29
Net increase (decrease) in short-term debt	(125)	70	(52)	50	(93)	43	0	0	(95)	163	(163)	0	0	163	(163)	0	0
Dividends on preferred securities							(16)	(17)	(18)
Distributions to noncontrolling interests - discontinued operations													(2)
Other financing activities	(92)	(31)	(23)	(10)	(54)	(11)	(6)	(3)	(14)
Net cash provided by (used in) financing activities	5,767	6,307	(1,271)	(390)	(612)	(1,081)	173	(90)	(298)	167	(456)	(40)	902	69	(260)	(83)	(132)	58	(137)	(2)	254
Effect of Exchange Rates on Cash and Cash Equivalents	(45)	13	0	0	13	0
Net Increase (Decrease) in Cash and Cash Equivalents	277	124	(299)	(282)	416	(219)	116	(281)	2	(18)	48	22	(8)	(2)	23	(1)	1	(1)	28	2	0
Cash and Cash Equivalents at Beginning of Period	925	801	1,100	661	245	464	204	485	483		11	7	15		2	5	4		3	2	2
Cash and Cash Equivalents at End of Period	1,202	925	801	379	661	245	320	204	485	11	59	29	7	2	25	4	5	3	31	4	2
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized	696	458	460	165	275	274	75	87	116	41	126	153	161	11	40	39	36	22	60	62	70
Income taxes - net	$ (76)	$ 313	$ 16	$ 69	$ 278	$ (91)	$ (44)	$ (33)	$ 106	$ (1)	$ (98)	$ 9	$ (8)	$ (8)	$ 20	$ 60	$ 23	$ (12)	$ 16	$ 74	$ (9)