Business And Significant Accounting Policies	9 Months Ended
Sep. 30, 2012
Accounting Policies [Abstract]
Business And Significant Accounting Policies	BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES Description of Business References in this report to "we," "our," "us" and "the company" are to EFIH and/or its direct and indirect subsidiaries as apparent in the context. See "Glossary" for defined terms. EFIH is a Dallas, Texas-based holding company whose wholly-owned subsidiary, Oncor Holdings, holds a majority interest (approximately 80%) in Oncor. Oncor is a regulated electricity transmission and distribution company principally engaged in providing delivery services to REPs, including subsidiaries of TCEH, that sell electricity to residential, business and other consumers in the north-central, eastern and western parts of Texas. EFIH is a direct, wholly-owned subsidiary of EFH Corp. EFIH has no reportable business segments. Oncor Holdings and its subsidiaries are not consolidated in EFIH's financial statements in accordance with consolidation accounting standards related to variable interest entities (VIEs) (see Note 2). Various "ring-fencing" measures have been taken to enhance the credit quality of Oncor Holdings and Oncor. These measures serve to mitigate Oncor's and Oncor Holdings' credit exposure to the Texas Holdings Group, which includes EFIH, and to reduce the risk that the assets and liabilities of Oncor or Oncor Holdings would be substantively consolidated with the assets and liabilities of the Texas Holdings Group in the event of a bankruptcy of one or more of Texas Holding Group's subsidiaries. Such measures include, among other things: Oncor's sale of a 19.75% equity interest to Texas Transmission in November 2008; maintenance of separate books and records for the Oncor Ring-Fenced Entities; the board of directors of Oncor Holdings and Oncor being comprised of a majority of independent directors, and prohibitions on the Oncor Ring-Fenced Entities' providing credit support to, or receiving credit support from, any member of the Texas Holdings Group. The assets and liabilities of the Oncor Ring-Fenced Entities are separate and distinct from those of the Texas Holdings Group, including TXU Energy and Luminant, and none of the assets of the Oncor Ring-Fenced Entities are available to satisfy the debt or contractual obligations of any member of the Texas Holdings Group. Oncor and Oncor Holdings do not bear any liability for debt or contractual obligations of the Texas Holdings Group (including, but not limited to, our debt obligations), and vice versa. Accordingly, Oncor Holdings' operations are conducted, and its cash flows managed, independently from the Texas Holdings Group. Basis of Presentation The condensed consolidated financial statements have been prepared in accordance with US GAAP and on the same basis as the audited financial statements included in our 2011 Form 10-K. Our investment in Oncor Holdings does not meet accounting standards criteria for consolidation and is accounted for under the equity method (see Note 2). Adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the results of operations and financial position have been included therein. All intercompany items and transactions have been eliminated in consolidation. Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with US GAAP have been omitted pursuant to the rules and regulations of the SEC. Because the condensed consolidated interim financial statements do not include all of the information and footnotes required by US GAAP, they should be read in conjunction with the audited financial statements and related notes included in our 2011 Form 10-K. The results of operations for an interim period may not give a true indication of results for a full year. All dollar amounts in the financial statements and tables in the notes are stated in millions of US dollars unless otherwise indicated. Use of Estimates Preparation of financial statements requires estimates and assumptions about future events that affect the reporting of assets and liabilities at the balance sheet dates and the reported amounts of income and expense, including fair value measurements. In the event estimates and/or assumptions prove to be different from actual amounts, adjustments are made in subsequent periods to reflect more current information.

BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES

Description of Business

References in this report to "we," "our," "us" and "the company" are to EFIH and/or its direct and indirect subsidiaries as apparent in the context. See "Glossary" for defined terms.

EFIH is a Dallas, Texas-based holding company whose wholly-owned subsidiary, Oncor Holdings, holds a majority interest (approximately 80%) in Oncor. Oncor is a regulated electricity transmission and distribution company principally engaged in providing delivery services to REPs, including subsidiaries of TCEH, that sell electricity to residential, business and other consumers in the north-central, eastern and western parts of Texas. EFIH is a direct, wholly-owned subsidiary of EFH Corp. EFIH has no reportable business segments. Oncor Holdings and its subsidiaries are not consolidated in EFIH's financial statements in accordance with consolidation accounting standards related to variable interest entities (VIEs) (see Note 2).

Various "ring-fencing" measures have been taken to enhance the credit quality of Oncor Holdings and Oncor. These measures serve to mitigate Oncor's and Oncor Holdings' credit exposure to the Texas Holdings Group, which includes EFIH, and to reduce the risk that the assets and liabilities of Oncor or Oncor Holdings would be substantively consolidated with the assets and liabilities of the Texas Holdings Group in the event of a bankruptcy of one or more of Texas Holding Group's subsidiaries. Such measures include, among other things: Oncor's sale of a 19.75% equity interest to Texas Transmission in November 2008; maintenance of separate books and records for the Oncor Ring-Fenced Entities; the board of directors of Oncor Holdings and Oncor being comprised of a majority of independent directors, and prohibitions on the Oncor Ring-Fenced Entities' providing credit support to, or receiving credit support from, any member of the Texas Holdings Group. The assets and liabilities of the Oncor Ring-Fenced Entities are separate and distinct from those of the Texas Holdings Group, including TXU Energy and Luminant, and none of the assets of the Oncor Ring-Fenced Entities are available to satisfy the debt or contractual obligations of any member of the Texas Holdings Group. Oncor and Oncor Holdings do not bear any liability for debt or contractual obligations of the Texas Holdings Group (including, but not limited to, our debt obligations), and vice versa. Accordingly, Oncor Holdings' operations are conducted, and its cash flows managed, independently from the Texas Holdings Group.

Basis of Presentation

The condensed consolidated financial statements have been prepared in accordance with US GAAP and on the same basis as the audited financial statements included in our 2011 Form 10-K. Our investment in Oncor Holdings does not meet accounting standards criteria for consolidation and is accounted for under the equity method (see Note 2). Adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the results of operations and financial position have been included therein. All intercompany items and transactions have been eliminated in consolidation. Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with US GAAP have been omitted pursuant to the rules and regulations of the SEC. Because the condensed consolidated interim financial statements do not include all of the information and footnotes required by US GAAP, they should be read in conjunction with the audited financial statements and related notes included in our 2011 Form 10-K. The results of operations for an interim period may not give a true indication of results for a full year. All dollar amounts in the financial statements and tables in the notes are stated in millions of US dollars unless otherwise indicated.

Use of Estimates

Preparation of financial statements requires estimates and assumptions about future events that affect the reporting of assets and liabilities at the balance sheet dates and the reported amounts of income and expense, including fair value measurements. In the event estimates and/or assumptions prove to be different from actual amounts, adjustments are made in subsequent periods to reflect more current information.