Condensed Statements Of Consolidated Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows - operating activities:
Net income	$ 308	$ 367
Adjustments to reconcile net income to cash used in operating activities:
Equity in earnings of unconsolidated subsidiary	(249)	(235)
Distributions of earnings from unconsolidated subsidiary	100	64
Deferred income taxes - net	(8)	2
PIK interest income on EFH Corp. Toggle Notes held as investment (Note 3)	(259)	(226)
Interest expense related to pushed-down debt of parent (Notes 4 and 8)	57	60
Noncash impairment of investment in long-term debt of affiliates (Note 3)	6	0
Accretion of purchase discount on investment in long-term debt of affiliates (Note 3)	(71)	(105)
Amortization of debt exchange and issuance costs	6	5
Income taxes payable to EFH Corp. (Note 7)	(118)	65
Other changes in operating assets and liabilities	32	2
Cash used in operating activities	(196)	(1)
Cash flows - financing activities:
Issuances of long-term debt (Note 4)	2,000	0
Distributions to EFH Corp.	(950)	0
Debt issuance costs and discounts	(42)	0
Cash provided by financing activities	1,008	0
Cash flows - investing activities:
Restricted cash related to debt issuance (Note 4)	(680)	0
Purchase of make-whole agreements between affiliate and unconsolidated subsidiary (Note 7)	(159)	0
Sale of make-whole agreements between affiliate and unconsolidated subsidiary (Note 7)	159	0
Cash used in investing activities	(680)	0
Net change in cash and cash equivalents	132	(1)
Cash and cash equivalents - beginning balance	46	43
Cash and cash equivalents - ending balance	$ 178	$ 42