SCHEDULE I - CONDENSED UNCONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Revenues
Operating Revenues	$ 2,848	[1]	$ 3,105	[1]	$ 3,450	[1]	$ 2,457	[1]	$ 3,222	[1]	$ 2,403	[1]	$ 2,549	[1]	$ 4,112	[1]	$ 11,860	$ 12,286	$ 12,737
Operating Expenses [Abstract]
Other operation and maintenance																	2,825	2,835	2,667
Total Operating Expenses																	9,521	9,177	9,636
Operating Income (Loss)	31	[1],[2]	857	[1]	758	[1]	693	[1]	822	[1]	664	[1]	572	[1]	1,051	[1]	2,339	3,109	3,101
Equity in earnings of subsidiaries																		(8)	1
Other Income (Expense) - net																	(23)	(39)	4
Interest Expense																	1,006	961	898
Income (Loss) Before Income Taxes																	1,309	2,082	2,201
Income Tax Expense (Benefit)																	180	545	691
Net Income (Loss)	(98)	[1],[2]	410	[1]	405	[1]	413	[1]	359	[1]	355	[1]	271	[1]	541	[1]	1,130	1,526	1,495
Comprehensive Income (Loss)																	1,505	374	1,186
L G And E And K U Energy L L C Unconsolidated [Member]
Operating Revenues
Operating Revenues
Operating Expenses [Abstract]
Other operation and maintenance																		3
Total Operating Expenses																		3
Operating Income (Loss)																		(3)
Equity in earnings of subsidiaries																	376	234	267
Interest Income from Affiliates																	5	10	29
Interest Expense																	39	39	31
Interest Expense with Affiliates																	3	2	2
Income (Loss) Before Income Taxes																	339	200	263
Income Tax Expense (Benefit)																	(8)	(19)	(2)
Net Income (Loss)																	347	219	265
Comprehensive Income (Loss)																	$ 375	$ 200	$ 263

[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.

[2] Fourth quarter of 2013 includes a charge for the termination of the lease of the Colstrip coal-fired electric generating facility in Montana. See Note 8 to the Financial Statements for additional information.