CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash Flows from Operating Activities
Net income	$ 545	$ 405
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	264	208
Amortization	55	47
Defined benefit plans - expense	42	39
Deferred income taxes and investment tax credits	257	204
Unrealized (gains) losses on derivatives, and other hedging activities	(235)	(96)
Other	20	10
Change in current assets and current liabilities
Accounts receivable	32	(57)
Accounts payable	(99)	(112)
Unbilled revenues	59	199
Prepayments	(100)	(85)
Counterparty collateral	65	(195)
Taxes	66	10
Accrued interest	37	55
Other	(45)	(5)
Other operating activities
Defined benefit plans - funding	(208)	(438)
Other assets	(12)	(4)
Other liabilities	(15)	11
Net cash provided by (used in) operating activities	728	196
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(682)	(428)
Proceeds from the sale of certain non-core generation facilities	0	381
Purchases of nuclear plant decommissioning trust investments	(38)	(79)
Proceeds from the sale of nuclear plant decommissioning trust investments	34	75
Proceeds from the sale of other investments	16	163
Net (increase) decrease in restricted cash and cash equivalents	(22)	(7)
Other investing activities	(19)	(7)
Net cash provided by (used in) investing activities	(711)	98
Cash Flows from Financing Activities
Issuance of common stock	16	16
Payment of common stock dividends	(203)	(170)
Net increase (decrease) in short-term debt	93	187
Other financing activities	(30)	(20)
Net cash provided by (used in) financing activities	(124)	13
Effect of Exchange Rates on Cash and Cash Equivalents	8	13
Net Increase (Decrease) in Cash and Cash Equivalents	(99)	320
Cash and Cash Equivalents at Beginning of Period	1,202	925
Cash and Cash Equivalents at End of Period	1,103	1,245
PPL Energy Supply [Member]
Cash Flows from Operating Activities
Net income	309	214
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	64	59
Amortization	38	33
Defined benefit plans - expense	10	9
Deferred income taxes and investment tax credits	161	105
Unrealized (gains) losses on derivatives, and other hedging activities	(260)	(105)
Other	17	13
Change in current assets and current liabilities
Accounts receivable	37	69
Accounts payable	(24)	(92)
Unbilled revenues	6	122
Fuel, materials and supplies	(51)	(17)
Prepayments	(7)	51
Counterparty collateral	65	(195)
Taxes	(26)	42
Accrued interest	23	25
Other	(26)	(12)
Other operating activities
Defined benefit plans - funding	(69)	(127)
Other assets	(12)	(3)
Other liabilities	(1)	11
Net cash provided by (used in) operating activities	254	202
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(199)	(127)
Proceeds from the sale of certain non-core generation facilities	0	381
Purchases of nuclear plant decommissioning trust investments	(38)	(79)
Proceeds from the sale of nuclear plant decommissioning trust investments	34	75
Net (increase) decrease in notes receivable from affiliates	198	(458)
Net (increase) decrease in restricted cash and cash equivalents	(19)	(5)
Other investing activities	(17)	(11)
Net cash provided by (used in) investing activities	(41)	(224)
Cash Flows from Financing Activities
Distributions to member	(557)	(81)
Cash included in net assets of subsidiary distributed to member	0	(325)
Net increase (decrease) in short-term debt	100	350
Net cash provided by (used in) financing activities	(457)	(56)
Net Increase (Decrease) in Cash and Cash Equivalents	(244)	(78)
Cash and Cash Equivalents at Beginning of Period	379	661
Cash and Cash Equivalents at End of Period	135	583
PPL Electric [Member]
Cash Flows from Operating Activities
Net income	37	56
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	39	33
Amortization	4	0
Defined benefit plans - expense	9	4
Deferred income taxes and investment tax credits	58	(29)
Other	5	3
Change in current assets and current liabilities
Accounts receivable	(11)	(61)
Accounts payable	(25)	(52)
Unbilled revenues	23	33
Prepayments	(70)	17
Regulatory assets and liabilities, net	0	37
Taxes	0	27
Other	(1)	(17)
Other operating activities
Defined benefit plans - funding	(54)	(98)
Other assets	0	1
Other liabilities	(24)	(1)
Net cash provided by (used in) operating activities	(10)	(47)
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(121)	(129)
Other investing activities	(1)	4
Net cash provided by (used in) investing activities	(122)	(125)
Cash Flows from Financing Activities
Payment of common stock dividends to parent	(35)	(18)
Dividends on preferred securities	(4)	(4)
Net cash provided by (used in) financing activities	(39)	(22)
Net Increase (Decrease) in Cash and Cash Equivalents	(171)	(194)
Cash and Cash Equivalents at Beginning of Period	320	204
Cash and Cash Equivalents at End of Period	149	10
LKE [Member]
Cash Flows from Operating Activities
Net income	53	87
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	86	81
Amortization	7	7
Defined benefit plans - expense	10	12
Deferred income taxes and investment tax credits	32	120
Other	(1)	(10)
Change in current assets and current liabilities
Accounts receivable	0	13
Accounts payable	16	(22)
Accounts payable to affiliates	4	(1)
Unbilled revenues	29	39
Fuel, materials and supplies	29	43
Income tax receivable	(9)	(26)
Accrued interest	30	28
Other	(1)	(29)
Other operating activities
Defined benefit plans - funding	(58)	(153)
Other assets	(1)	0
Other liabilities	6	4
Net cash provided by (used in) operating activities	232	193
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(174)	(69)
Proceeds from the sale of other investments	0	163
Net (increase) decrease in notes receivable from affiliates	10	16
Net (increase) decrease in restricted cash and cash equivalents	2	(2)
Net cash provided by (used in) investing activities	(162)	108
Cash Flows from Financing Activities
Debt issuance and credit facility costs	0	(1)
Distributions to member	(25)	(54)
Net increase (decrease) in short-term debt	0	(163)
Net cash provided by (used in) financing activities	(25)	(218)
Net Increase (Decrease) in Cash and Cash Equivalents	45	83
Cash and Cash Equivalents at Beginning of Period	59	11
Cash and Cash Equivalents at End of Period	104	94
LGE [Member]
Cash Flows from Operating Activities
Net income	25	39
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	38	36
Defined benefit plans - expense	4	5
Deferred income taxes and investment tax credits	16	13
Other	(1)	(1)
Change in current assets and current liabilities
Accounts receivable	(9)	9
Accounts payable	14	(13)
Accounts payable to affiliates	(10)	(5)
Unbilled revenues	16	23
Fuel, materials and supplies	19	40
Other	13	8
Other operating activities
Defined benefit plans - funding	(24)	(65)
Other liabilities	1	2
Net cash provided by (used in) operating activities	102	91
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(60)	(33)
Proceeds from the sale of other investments	0	163
Net (increase) decrease in restricted cash and cash equivalents	2	(2)
Net cash provided by (used in) investing activities	(58)	128
Cash Flows from Financing Activities
Payment of common stock dividends to parent	(15)	(17)
Debt issuance and credit facility costs	0	(1)
Net increase (decrease) in notes payable to affiliates	0	(12)
Net increase (decrease) in short-term debt	0	(163)
Net cash provided by (used in) financing activities	(15)	(193)
Net Increase (Decrease) in Cash and Cash Equivalents	29	26
Cash and Cash Equivalents at Beginning of Period	25	2
Cash and Cash Equivalents at End of Period	54	28
KU [Member]
Cash Flows from Operating Activities
Net income	38	58
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	48	45
Defined benefit plans - expense	3	4
Deferred income taxes and investment tax credits	25	22
Other	6	(3)
Change in current assets and current liabilities
Accounts receivable	(7)	20
Accounts payable	10	3
Accounts payable to affiliates	3	(7)
Unbilled revenues	13	16
Fuel, materials and supplies	10	3
Other	16	13
Other operating activities
Defined benefit plans - funding	(17)	(44)
Other assets	(1)	0
Other liabilities	5	1
Net cash provided by (used in) operating activities	152	131
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(113)	(36)
Net cash provided by (used in) investing activities	(113)	(36)
Cash Flows from Financing Activities
Payment of common stock dividends to parent	(24)	(31)
Net increase (decrease) in notes payable to affiliates	0	(10)
Net cash provided by (used in) financing activities	(24)	(41)
Net Increase (Decrease) in Cash and Cash Equivalents	15	54
Cash and Cash Equivalents at Beginning of Period	31	3
Cash and Cash Equivalents at End of Period	$ 46	$ 57