SCHEDULE I - CONDENSED UNCONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended			2 Months Ended	12 Months Ended		10 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		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]
Operating Revenues
Operating Revenues	$ 3,222	[1]	$ 2,403	[1]	$ 2,549	[1]	$ 4,112	[1]	$ 4,218	[1]	$ 3,120	[1]	$ 2,489	[1]	$ 2,910	[1]	$ 12,286	$ 12,737	$ 8,521
Operating Expenses [Abstract]
Other operation and maintenance																	2,835	2,667	1,756		3		(3)
Total Operating Expenses																	9,177	9,636	6,655		3		(3)
Operating Income	822	[1]	664	[1]	572	[1]	1,051	[1]	934	[1]	767	[1]	595	[1]	805	[1]	3,109	3,101	1,866		(3)		3
Equity in earnings of subsidiaries																				48	234	267	204
Other Income (Expense) - net																	(39)	4	(31)				(1)
Interest Income from Affiliates																				5	10	29	29
Interest Expenses																	961	898	593	4	39	31
Interest Expense with Affiliates																				1	2	2	47
Income from Continuing Operations Before Income Taxes																	2,082	2,201	1,239	48	200	263	188
Income Tax Expense (Benefit)																	545	691	263	1	(19)	(2)	(2)
Net Income Attributable to Shareowners	359	[1]	355	[1]	271	[1]	541	[1]	454	[1]	444	[1]	196	[1]	401	[1]	1,526	1,495	938	47	219	265	190
Comprehensive Income (Loss) Attributable to Shareowners																	$ 374	$ 1,186	$ 996	$ 53	$ 200	$ 263	$ 180

[1] Quarterly results can vary depending on, among other things, weather and the forward pricing of power. Accordingly, comparisons among quarters of a year may not be indicative of overall trends and changes in operations.