SCHEDULE I - CONDENSED UNCONSOLIDATED STATEMENTS OF CASH FLOWS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows from Operating Activities
Net cash provided by (used in) operating activities	$ 2,857	$ 2,764	$ 2,507
Cash Flows from Investing Activities
Net cash provided by (used in) investing activities	(4,295)	(3,123)	(7,952)
Cash Flows from Financing Activities
Net increase (decrease) in short-term debt	49	74	(125)
Retirement of long-term debt	(747)	(108)	(1,210)
Issuance of long-term debt	2,038	1,223	5,745
Debt-issuance costs	(49)	(17)	(102)
Payment of common stock dividends	(878)	(833)	(746)
Net cash provided by (used in) financing activities	1,631	48	5,767
Net Increase (Decrease) in Cash and Cash Equivalents	201	(301)	277
Cash and Cash Equivalents at Beginning of Period	901	1,202	925
Cash and Cash Equivalents at End of Period	1,102	901	1,202
L G And E And K U Energy L L C Unconsolidated [Member]
Cash Flows from Operating Activities
Net cash provided by (used in) operating activities	136	364	346
Cash Flows from Investing Activities
Capital contributions to affiliated subsidiaries	(243)
Net (increase) decrease in notes receivable from affiliates	(122)	(15)	(63)
Net cash provided by (used in) investing activities	(365)	(15)	(63)
Cash Flows from Financing Activities
Net increase (decrease) in short-term debt	75
Issuance of long-term debt			250
Contributions from member	243
Distributions to member	(254)	(155)	(533)
Net increase (decrease) in notes payable to affiliates	171	(196)
Net cash provided by (used in) financing activities	235	(351)	(283)
Net Increase (Decrease) in Cash and Cash Equivalents	6	(2)
Cash and Cash Equivalents at Beginning of Period		2	2
Cash and Cash Equivalents at End of Period	6		2
Supplemental Disclosures of Cash Flow Information:
Cash Dividends Received from Affiliated Subsidiaries	$ 223	$ 175	$ 207