CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011
Cash Flows from Operating Activities
Net income	$ 1,171		$ 1,054
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	813		697
Amortization	144		180
Defined benefit plans - expense	123		165
Deferred income taxes and investment tax credits	298		403
Unrealized (gains) losses on derivatives, and other hedging activities	21		(190)
Other	34		110
Change in current assets and current liabilities
Accounts receivable	19		(134)
Accounts payable	(175)		(164)
Unbilled revenues	121		236
Prepayments	(11)		286
Counterparty collateral	13		(273)
Taxes	29		(64)
Accrued interest	43		111
Other	15		87
Other operating activities
Defined benefit plans - funding	(526)		(565)
Other assets	1		(22)
Other liabilities	(39)		(71)
Net cash provided by (used in) operating activities	2,094		1,846
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(2,078)		(1,685)
Proceeds from the sale of certain non-core generation facilities			381
Ironwood Acquisition, net of cash acquired	(84)
Acquisition of WPD Midlands			(5,763)
Purchases of nuclear plant decommissioning trust investments	(112)		(144)
Proceeds from the sale of nuclear plant decommissioning trust investments	102		134
Proceeds from the sale of other investments	20		163
Net (increase) decrease in restricted cash and cash equivalents	62		(51)
Other investing activities	(26)		(74)
Net cash provided by (used in) investing activities	(2,116)		(7,039)
Cash Flows from Financing Activities
Issuance of long-term debt	824		5,245
Retirement of long-term debt	(105)		(708)
Issuance of common stock	54		2,281
Payment of common stock dividends	(623)		(543)
Redemption of preference stock of a subsidiary	(250)
Debt issuance and credit facility costs	(10)		(84)
Contract adjustment payments	(71)		(49)
Net increase (decrease) in short-term debt	(51)		(322)
Other financing activities	(8)		(16)
Net cash provided by (used in) financing activities	(240)		5,804
Effect of Exchange Rates on Cash and Cash Equivalents	6		(25)
Net Increase (Decrease) in Cash and Cash Equivalents	(256)		586
Cash and Cash Equivalents at Beginning of Period	1,202		925
Cash and Cash Equivalents at End of Period	946		1,511
PPL Energy Supply LLC [Member]
Cash Flows from Operating Activities
Net income	383		473
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	206		182
Amortization	93		96
Defined benefit plans - expense	33		26
Deferred income taxes and investment tax credits	132		226
Unrealized (gains) losses on derivatives, and other hedging activities	(37)		(155)
Other	33		42
Change in current assets and current liabilities
Accounts receivable	(26)		(43)
Accounts payable	(110)		(163)
Unbilled revenues	78		116
Counterparty collateral	12		(273)
Other	(48)		92
Other operating activities
Defined benefit plans - funding	(70)		(136)
Other assets	(16)		(31)
Other liabilities	11		(12)
Net cash provided by (used in) operating activities	674		440
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(460)		(499)
Proceeds from the sale of certain non-core generation facilities			381
Ironwood Acquisition, net of cash acquired	(84)
Expenditures for intangible assets	(36)		(45)
Purchases of nuclear plant decommissioning trust investments	(112)		(144)
Proceeds from the sale of nuclear plant decommissioning trust investments	102		134
Net (increase) decrease in notes receivable from affiliates	198
Net (increase) decrease in restricted cash and cash equivalents	70		(36)
Other investing activities	14		7
Net cash provided by (used in) investing activities	(308)		(202)
Cash Flows from Financing Activities
Retirement of long-term debt	(6)		(250)
Contributions from member	472		361
Distributions to member	(733)		(209)
Cash included in net assets of subsidiary distributed to member			(325)
Net increase (decrease) in short-term debt	(45)		(100)
Other financing activities	(1)		(1)
Net cash provided by (used in) financing activities	(313)		(524)
Net Increase (Decrease) in Cash and Cash Equivalents	53		(286)
Cash and Cash Equivalents at Beginning of Period	379		661
Cash and Cash Equivalents at End of Period	432		375
PPL Electric Utilities Corp [Member]
Cash Flows from Operating Activities
Net income	99	[1]	128	[1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	119		108
Amortization	13		5
Defined benefit plans - expense	17		13
Deferred income taxes and investment tax credits	72		9
Other	3		2
Change in current assets and current liabilities
Accounts receivable	48		(5)
Accounts payable	(43)		(105)
Unbilled revenues	18		53
Prepayments	2		58
Regulatory assets and liabilities	(1)		95
Taxes			19
Other	(5)		(7)
Other operating activities
Defined benefit plans - funding	(54)		(102)
Other assets			(1)
Other liabilities	(27)		(9)
Net cash provided by (used in) operating activities	261		261
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(407)		(357)
Net (increase) decrease in notes receivable from affiliates	(210)
Other investing activities	3		4
Net cash provided by (used in) investing activities	(614)		(353)
Cash Flows from Financing Activities
Issuance of long-term debt	249		645
Retirement of long-term debt			(458)
Contributions from parent	150		56
Redemption of preference stock of a subsidiary	(250)
Payment of common stock dividends to parent	(75)		(76)
Other financing activities	(10)		(18)
Net cash provided by (used in) financing activities	64		149
Net Increase (Decrease) in Cash and Cash Equivalents	(289)		57
Cash and Cash Equivalents at Beginning of Period	320		204
Cash and Cash Equivalents at End of Period	31		261
LG And E And KU Energy LLC [Member]
Cash Flows from Operating Activities
Net income	180	[1]	217	[1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	259		249
Amortization	20		20
Defined benefit plans - expense	30		38
Deferred income taxes and investment tax credits	92		206
Other	(5)		(14)
Change in current assets and current liabilities
Accounts receivable	(25)		1
Accounts payable	4		(28)
Unbilled revenues	26		58
Fuel, materials and supplies	4		30
Income tax receivable	3		40
Taxes	51		2
Other	48		19
Other operating activities
Defined benefit plans - funding	(66)		(159)
Other assets	(3)		(8)
Other liabilities	28		12
Net cash provided by (used in) operating activities	646		683
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(525)		(296)
Proceeds from the sale of other investments			163
Net (increase) decrease in notes receivable from affiliates	9		8
Net (increase) decrease in restricted cash and cash equivalents	(3)		(11)
Net cash provided by (used in) investing activities	(519)		(136)
Cash Flows from Financing Activities
Issuance of long-term debt			250
Distributions to member	(95)		(469)
Debt issuance and credit facility costs	(1)		(6)
Net increase (decrease) in short-term debt			(163)
Net cash provided by (used in) financing activities	(96)		(388)
Net Increase (Decrease) in Cash and Cash Equivalents	31		159
Cash and Cash Equivalents at Beginning of Period	59		11
Cash and Cash Equivalents at End of Period	90		170
Louisville Gas And Electric Co [Member]
Cash Flows from Operating Activities
Net income	94	[1]	102	[1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	114		110
Amortization	8		9
Defined benefit plans - expense	14		16
Deferred income taxes and investment tax credits	40		38
Other	(11)		2
Change in current assets and current liabilities
Accounts receivable	(5)		21
Accounts payable	2		(16)
Unbilled revenues	16		39
Fuel, materials and supplies	(10)		16
Taxes	21		9
Other	13		3
Other operating activities
Defined benefit plans - funding	(26)		(68)
Other assets	(2)		(7)
Other liabilities	(1)		5
Net cash provided by (used in) operating activities	267		279
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(193)		(127)
Proceeds from the sale of other investments			163
Net (increase) decrease in restricted cash and cash equivalents	(3)		(11)
Net cash provided by (used in) investing activities	(196)		25
Cash Flows from Financing Activities
Payment of common stock dividends to parent	(47)		(55)
Debt issuance and credit facility costs	(1)		(1)
Net increase (decrease) in notes payable to affiliates			(12)
Net increase (decrease) in short-term debt			(163)
Net cash provided by (used in) financing activities	(48)		(231)
Net Increase (Decrease) in Cash and Cash Equivalents	23		73
Cash and Cash Equivalents at Beginning of Period	25		2
Cash and Cash Equivalents at End of Period	48		75
Kentucky Utilities Co [Member]
Cash Flows from Operating Activities
Net income	118	[1]	144	[1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	145		139
Amortization	9		10
Defined benefit plans - expense	9		11
Deferred income taxes and investment tax credits	78		78
Other	1		(16)
Change in current assets and current liabilities
Accounts receivable	(34)		8
Accounts payable	9		5
Accounts payable to affiliates	(4)		(21)
Unbilled revenues	10		19
Fuel, materials and supplies	16		14
Taxes	26		(5)
Other	32		15
Other operating activities
Defined benefit plans - funding	(20)		(46)
Other assets	(1)		(1)
Other liabilities	16		5
Net cash provided by (used in) operating activities	410		359
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(331)		(168)
Net cash provided by (used in) investing activities	(331)		(168)
Cash Flows from Financing Activities
Payment of common stock dividends to parent	(68)		(88)
Debt issuance and credit facility costs			(2)
Net increase (decrease) in notes payable to affiliates			(10)
Net cash provided by (used in) financing activities	(68)		(100)
Net Increase (Decrease) in Cash and Cash Equivalents	11		91
Cash and Cash Equivalents at Beginning of Period	31		3
Cash and Cash Equivalents at End of Period	$ 42		$ 94

[1] Net income approximates comprehensive income.