Supplemental Guarantor Condensed Financial Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Debt and Capital Lease Obligations	$ 103	$ 526
Push Down Debt [Member]
Condensed Financial Statements, Captions [Line Items]
Debt and Capital Lease Obligations	30	450
Energy Future Holdings Senior Notes [Member] \| Push Down Debt [Member]
Condensed Financial Statements, Captions [Line Items]
Debt and Capital Lease Obligations	30	62
Energy Future Holdings Senior Secured Notes to Parent [Member] \| Push Down Debt [Member]
Condensed Financial Statements, Captions [Line Items]
Debt and Capital Lease Obligations		$ 388

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13,16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant