CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 PPL Energy Supply [Member]	Sep. 30, 2010 PPL Energy Supply [Member]	Sep. 30, 2011 PPL Electric [Member]	Sep. 30, 2010 PPL Electric [Member]	Sep. 30, 2011 LKE [Member] Successor [Member]	Sep. 30, 2010 LKE [Member] Successor [Member]	Sep. 30, 2010 LKE [Member] Predecessor [Member]	Sep. 30, 2011 LGE [Member] Successor [Member]	Sep. 30, 2010 LGE [Member] Predecessor [Member]	Sep. 30, 2011 KU [Member] Successor [Member]	Sep. 30, 2010 KU [Member] Predecessor [Member]
Cash Flows from Operating Activities
Net income	$ 1,054	$ 600	$ 473	$ 552	$ 128	$ 105	$ 217		$ 194	$ 102	$ 107	$ 144	$ 129
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	697	387	182	274	108	101	249		211	110	104	139	106
Amortization	180	156	96	109	5	(15)
Defined benefit plans - expense	165	72	26	41	13	16	38		55	24	17	19	11
Deferred income taxes and investment tax credits	403	(179)	226	(235)	9	52	206		83	38	30	78	42
Impairment of assets	13	118	13	118
Unrealized (gains) losses on derivatives, and other hedging activities	(190)	595	(155)	602			0		14	0	14
Provision for Montana hydroelectric litigation	10	62	10	62
Regulatory asset for previously recorded losses on interest rate swaps							0		(22)	0	(22)
Other	87	54	19	47	2	5	(9)		(2)	3	1	(14)	(3)
Change in current assets and current liabilities
Accounts receivable	(134)	(93)	(43)	43	(5)	(34)	2		(31)	12	(12)	(3)	(14)
Accounts payable	(164)	74	(163)	(31)	(105)	(15)	(28)		(33)	(16)	(5)	(16)	11
Unbilled revenue	236	37	116	(45)	53	82	58		22	39	14	19	8
Fuel, materials and supplies							30		(14)	16	(11)	14	(3)
Prepayments	286	(48)			58	(71)
Regulatory assets							0		11			0	18
Income tax receivable							40		15
Other current assets							5		9	2	(4)	0	2
Counterparty collateral	(273)	169	(273)	169
Regulatory liabilities							0		(17)	0	(25)
Taxes	(64)	45	61	112	19	(11)
Regulatory assets and liabilities, net	96	(31)			95	(31)
Accrued interest	111	56
Other current liabilities							21		7	13	(2)	11	6
Other	(9)	26	31	80	(7)	(7)
Other operating activities
Defined benefit plans - funding	(565)	(371)	(136)	(293)	(102)	(49)	(159)		(54)	(68)	(24)	(46)	(17)
Regulatory liabilities							0		(20)	0	(11)
Discontinued operations							0		27
Change in smelter contract liability							0		(45)
Other assets	(22)	(31)	(31)	(64)	(1)	22	6		(35)	0	(6)	7	13
Other liabilities	(71)	(2)	(12)	54	(9)	(23)	(2)		35	(1)	(3)	0	(9)
Net cash provided by (used in) operating activities	1,846	1,696	440	1,595	261	127	674		410	274	162	352	300
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(1,685)	(980)	(499)	(707)	(357)	(251)	(287)		(326)	(122)	(108)	(161)	(218)
Proceeds from the sale of certain non-core generation facilities	381	0	381	0
Proceeds from the sale of Long Island generation business	0	124	0	124
Proceeds from sales of discontinued operations							0		21
Proceeds from the sale of assets to affiliates										0	48
Purchases of assets from affiliates												0	(48)
Acquisition of WPD Midlands	(5,763)	0
Expenditures for intangible assets			(45)	(60)
Purchases of nuclear plant decommissioning trust investments	(144)	(93)	(144)	(93)
Proceeds from the sale of nuclear plant decommissioning trust investments	134	83	134	83
Proceeds from the sale of other investments	163	0					163		0	163	0
Net (increase) decrease in notes receivable from affiliates							8		0
Net (increase) decrease in restricted cash and cash equivalents	(51)	78	(36)	76			(11)		0	(11)	0
Other investing activities	(74)	(52)	7	9	4	(2)
Net cash provided by (used in) investing activities	(7,039)	(840)	(202)	(568)	(353)	(253)	(127)		(305)	30	(60)	(161)	(266)
Cash Flows from Financing Activities
Issuance of short-term debt with affiliates							0		825
Retirement of short-term debt with affiliate							0		(575)
Issuance of long-term debt	5,245	1,750	0	600	645	0	250		0
Issuance of long-term debt with affiliates							0		50
Retirement of long-term debt	(708)	0	(250)	0	(458)	0
Retirement of long-term debt with affiliates							0		(250)
Issuance of common stock	2,281	2,425
Payment of common stock dividends	(543)	(397)			(76)	(49)				(55)	(55)	(88)	(50)
Contributions from parent					56	55
Redemption of preferred stock of a subsidiary	0	(54)			0	(54)
Debt issuance and credit facility costs	(84)	(79)					(6)		0	(1)	0	(2)	0
Contributions from member			361	3,525
Distributions to member			(209)	(512)			(469)		(62)
Cash included in net assets of subsidiary distributed to member			(325)	0
Net increase (decrease) in note payable to affiliates					0	0		0	(94)	(12)	(48)	(10)	16
Net increase (decrease) in short-term debt	(322)	(443)	(100)	(443)			(163)		0	(163)	0
Dividends on preferred securities					(12)	(13)
Other financing activities	(65)	(16)	(1)	(10)	(6)	(1)
Net cash provided by (used in) financing activities	5,804	3,186	(524)	3,160	149	(62)	(388)		(106)	(231)	(103)	(100)	(34)
Effect of Exchange Rates on Cash and Cash Equivalents	(25)	10	0	10
Net Increase (Decrease) in Cash and Cash Equivalents	586	4,052	(286)	4,197	57	(188)	159		(1)	73	(1)	91	0
Cash and Cash Equivalents at Beginning of Period	925	801	661	245	204	485	11		7	2	5	3	2
Cash and Cash Equivalents at End of Period	$ 1,511	$ 4,853	$ 375	$ 4,442	$ 261	$ 297	$ 170		$ 6	$ 75	$ 4	$ 94	$ 2