CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Cash Flows from Operating Activities
Net income (loss)	$ 413		$ 545
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	284		264
Amortization	64		55
Defined benefit plans - expense	51		42
Deferred income taxes and investment tax credits	80		257
Unrealized (gains) losses on derivatives, and other hedging activities	98		(235)
Other	30		20
Change in current assets and current liabilities
Accounts receivable	(187)		32
Accounts payable	(138)		(99)
Unbilled revenues	137		59
Prepayments	(117)		(100)
Counterparty collateral	(64)		65
Taxes	122		66
Other	(74)		(8)
Other operating activities
Defined benefit plans - funding	(429)		(208)
Other assets	33		(12)
Other liabilities	(59)		(15)
Net cash provided by (used in) operating activities	244		728
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(828)		(682)
Purchases of nuclear plant decommissioning trust investments	(28)		(38)
Proceeds from the sale of nuclear plant decommissioning trust investments	24		34
Proceeds from the sale of other investments			16
Net (increase) decrease in restricted cash and cash equivalents	(52)		(22)
Other investing activities	(15)		(19)
Net cash provided by (used in) investing activities	(899)		(711)
Cash Flows from Financing Activities
Issuance of long-term debt	450
Retirement of long-term debt	(8)
Issuance of common stock	20		16
Payment of common stock dividends	(210)		(203)
Debt issuance and credit facility costs	(18)		(3)
Contract adjustment payments	(24)		(23)
Net increase (decrease) in short-term debt	416		93
Other financing activities	(5)		(4)
Net cash provided by (used in) financing activities	621		(124)
Effect of Exchange Rates on Cash and Cash Equivalents	(14)		8
Net Increase (Decrease) in Cash and Cash Equivalents	(48)		(99)
Cash and Cash Equivalents at Beginning of Period	901		1,202
Cash and Cash Equivalents at End of Period	853		1,103
PPL Energy Supply LLC [Member]
Cash Flows from Operating Activities
Net income (loss)	(38)		309
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	78		64
Amortization	44		38
Defined benefit plans - expense	12		10
Deferred income taxes and investment tax credits	(21)		161
Unrealized (gains) losses on derivatives, and other hedging activities	214		(260)
Other	19		17
Change in current assets and current liabilities
Accounts receivable	71		37
Accounts payable	(108)		(24)
Unbilled revenues	123		6
Fuel, materials and supplies	11		(51)
Prepayments	(104)		(7)
Counterparty collateral	(64)		65
Taxes
Other	23		(29)
Other operating activities
Defined benefit plans - funding	(105)		(69)
Other assets	44		(12)
Other liabilities	(74)		(1)
Net cash provided by (used in) operating activities	125		254
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(124)		(199)
Expenditures for intangible assets	(10)		(13)
Purchases of nuclear plant decommissioning trust investments	(28)		(38)
Proceeds from the sale of nuclear plant decommissioning trust investments	24		34
Net (increase) decrease in notes receivable from affiliates			198
Net (increase) decrease in restricted cash and cash equivalents	(59)		(19)
Other investing activities	2		(4)
Net cash provided by (used in) investing activities	(195)		(41)
Cash Flows from Financing Activities
Retirement of long-term debt	(8)
Distributions to member	(313)		(557)
Net increase (decrease) in short-term debt	125		100
Net cash provided by (used in) financing activities	(196)		(457)
Net Increase (Decrease) in Cash and Cash Equivalents	(266)		(244)
Cash and Cash Equivalents at Beginning of Period	413		379
Cash and Cash Equivalents at End of Period	147		135
PPL Electric Utilities Corp [Member]
Cash Flows from Operating Activities
Net income (loss)	64	[1]	37	[1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	43		39
Amortization	5		4
Defined benefit plans - expense	7		9
Deferred income taxes and investment tax credits	45		58
Other	3		5
Change in current assets and current liabilities
Accounts receivable	(87)		(11)
Accounts payable	(40)		(25)
Unbilled revenues	5		23
Prepayments	(28)		(70)
Taxes	15
Other	(26)		(1)
Other operating activities
Defined benefit plans - funding	(88)		(54)
Other assets	8
Other liabilities	(3)		(24)
Net cash provided by (used in) operating activities	(77)		(10)
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(189)		(121)
Other investing activities	(3)		(1)
Net cash provided by (used in) investing activities	(192)		(122)
Cash Flows from Financing Activities
Contributions from parent	60
Payment of common stock dividends to parent	(25)		(35)
Net increase (decrease) in short-term debt	125
Other financing activities			(4)
Net cash provided by (used in) financing activities	160		(39)
Net Increase (Decrease) in Cash and Cash Equivalents	(109)		(171)
Cash and Cash Equivalents at Beginning of Period	140		320
Cash and Cash Equivalents at End of Period	31		149
LG And E And KU Energy LLC [Member]
Cash Flows from Operating Activities
Net income (loss)	96	[1]	53	[1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	82		86
Amortization	7		7
Defined benefit plans - expense	17		10
Deferred income taxes and investment tax credits	45		32
Other	1		(1)
Change in current assets and current liabilities
Accounts receivable	(78)
Accounts payable	31		16
Accounts payable to affiliates	1		4
Unbilled revenues			29
Fuel, materials and supplies	47		29
Taxes	(2)		9
Accrued interest	30		30
Other	(29)		(19)
Other operating activities
Defined benefit plans - funding	(154)		(58)
Other assets	2		(1)
Other liabilities	(11)		6
Net cash provided by (used in) operating activities	85		232
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(271)		(174)
Net (increase) decrease in notes receivable from affiliates			10
Net (increase) decrease in restricted cash and cash equivalents	4		2
Net cash provided by (used in) investing activities	(267)		(162)
Cash Flows from Financing Activities
Contributions from member	75
Distributions to member	(4)		(25)
Net increase (decrease) in notes payable to affiliates	60
Net increase (decrease) in short-term debt	60
Net cash provided by (used in) financing activities	191		(25)
Net Increase (Decrease) in Cash and Cash Equivalents	9		45
Cash and Cash Equivalents at Beginning of Period	43		59
Cash and Cash Equivalents at End of Period	52		104
Louisville Gas And Electric Co [Member]
Cash Flows from Operating Activities
Net income (loss)	44	[2]	25	[2]
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	36		38
Amortization	3
Defined benefit plans - expense	6		4
Deferred income taxes and investment tax credits	11		16
Other	(5)		(1)
Change in current assets and current liabilities
Accounts receivable	(37)		(9)
Accounts payable	9		14
Accounts payable to affiliates	(7)		(10)
Unbilled revenues	1		16
Fuel, materials and supplies	37		19
Taxes	17		5
Other	11		8
Other operating activities
Defined benefit plans - funding	(43)		(24)
Other liabilities	2		1
Net cash provided by (used in) operating activities	85		102
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(98)		(60)
Net (increase) decrease in restricted cash and cash equivalents	4		2
Net cash provided by (used in) investing activities	(94)		(58)
Cash Flows from Financing Activities
Contributions from parent	25
Payment of common stock dividends to parent	(19)		(15)
Net increase (decrease) in short-term debt	15
Net cash provided by (used in) financing activities	21		(15)
Net Increase (Decrease) in Cash and Cash Equivalents	12		29
Cash and Cash Equivalents at Beginning of Period	22		25
Cash and Cash Equivalents at End of Period	34		54
Kentucky Utilities Co [Member]
Cash Flows from Operating Activities
Net income (loss)	64	[1]	38	[1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	46		48
Amortization	4
Defined benefit plans - expense	5		3
Deferred income taxes and investment tax credits	35		25
Other	9		6
Change in current assets and current liabilities
Accounts receivable	(31)		(7)
Accounts payable	32		10
Accounts payable to affiliates	8		3
Unbilled revenues	(1)		13
Fuel, materials and supplies	10		10
Taxes	(17)		4
Accrued interest	15		15
Other	(20)		(3)
Other operating activities
Defined benefit plans - funding	(60)		(17)
Other assets	1		(1)
Other liabilities	(15)		5
Net cash provided by (used in) operating activities	85		152
Cash Flows from Investing Activities
Expenditures for property, plant and equipment	(172)		(113)
Net cash provided by (used in) investing activities	(172)		(113)
Cash Flows from Financing Activities
Contributions from parent	50
Payment of common stock dividends to parent	(13)		(24)
Net increase (decrease) in short-term debt	45
Net cash provided by (used in) financing activities	82		(24)
Net Increase (Decrease) in Cash and Cash Equivalents	(5)		15
Cash and Cash Equivalents at Beginning of Period	21		31
Cash and Cash Equivalents at End of Period	$ 16		$ 46

[1] Net income approximates comprehensive income.

[2] Net income equals comprehensive income.