SCHEDULE I - CONDENSED UNCONSOLIDATED STATEMENTS OF CASH FLOWS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			2 Months Ended	12 Months Ended		10 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 L G And E And K U Energy L L C Unconsolidated [Member] Successor [Member]	Dec. 31, 2012 L G And E And K U Energy L L C Unconsolidated [Member] Successor [Member]	Dec. 31, 2011 L G And E And K U Energy L L C Unconsolidated [Member] Successor [Member]	Oct. 31, 2010 L G And E And K U Energy L L C Unconsolidated [Member] Predecessor [Member]
Cash Flows from Operating Activities
Net cash provided by (used in) operating activities	$ 2,764	$ 2,507	$ 2,033	$ 53	$ 364	$ 346	$ 156
Cash Flows from Investing Activities
Capital contributions to affiliated subsidiaries				(3)			(525)
Net (increase) decrease in notes receivable from affiliates				313	(15)	(63)	234
Net cash provided by (used in) investing activities	(3,123)	(7,952)	(8,229)	310	(15)	(63)	(291)
Cash Flows from Financing Activities
Net increase (decrease) in debt with affiliates				(208)			243
Repayment of short-term borrowings				(2,103)
Retirement of long-term debt	(108)	(1,210)	(20)	(400)
Issuance of long-term debt	1,223	5,745	4,642	870		250
Debt-issuance costs	(17)	(102)	(175)	(6)
Contributions from member				1,565
Distributions to member				(100)	(155)	(533)
Payment of common stock dividends	(833)	(746)	(566)				(87)
Net increase (decrease) in notes payable to affiliates					(196)
Net cash provided by (used in) financing activities	48	5,767	6,307	(382)	(351)	(283)	156
Net Increase (Decrease) in Cash and Cash Equivalents	(301)	277	124	(19)	(2)		21
Cash and Cash Equivalents at Beginning of Period	1,202	925	801	21	2	2
Cash and Cash Equivalents at End of Period	901	1,202	925	2		2	21
Supplemental Disclosures of Cash Flow Information:
Cash Dividends Received from Affiliated Subsidiaries					$ 175	$ 207	$ 105