New Financial Accounting Standards	3 Months Ended
New Financial Accounting Standards	Mar. 31, 2013
New Financial Accounting Standards	Note M — New Financial Accounting Standards In December 2011 and January 2013, the Financial Accounting Standards Board (FASB) issued amendments to address and clarify the scope of the balance sheet off-setting disclosure guidance within Accounting Standards Codification (ASC) 210, “Balance Sheet.” ASU No. 2011-11 and ASU No. 2013-01, “Balance Sheet (Topic 210): Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities,” provide guidance that requires a reporting entity to disclose certain quantitative information concerning financial and derivative instruments that are offset in the balance sheet and a description of the rights of setoff, including the nature of such rights, associated with recognized assets and liabilities that are subject to an enforceable master netting arrangement or similar agreement. ASU No. 2013-01 clarifies that financial instruments subject to the disclosure guidance are (1) derivatives accounted for in accordance with ASC 815, Derivatives and Hedging, (2) repurchase agreements and reverse purchase agreements and (3) securities borrowing and securities lending transactions that are either offset in accordance with ASC Section 210-20-45 or Section 815-10-45 or subject to an enforceable master netting arrangement or similar agreement. A reporting entity electing gross presentation of such assets and liabilities in its balance sheet will still be subject to the same disclosure requirements. Both ASUs are applicable for fiscal years beginning on or after January 1, 2013, interim periods within those fiscal years, and retrospectively for all comparative periods presented. The application of this guidance does not have a material impact on the Companies’ financial position, results of operations and liquidity. See Note K. In February 2013, the FASB issued amendments to improve the reporting of reclassifications out of accumulated OCI through ASU No. 2013-02, “Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” The amendments require an entity to provide information either on the face of the financial statements or in a single footnote on significant amounts reclassified out of accumulated OCI and the related income statement line items to the extent an amount is reclassified in its entirety to net income under U.S. GAAP. For significant items not reclassified to net income in their entirety, an entity is required to cross-reference to other disclosures that provide additional information. For public entities, the amendments are effective prospectively for reporting periods beginning after December 15, 2012. The application of this guidance does not have a material impact on the Companies’ financial position, results of operations and liquidity. See Note A.
CECONY [Member]
New Financial Accounting Standards	Note M — New Financial Accounting Standards In December 2011 and January 2013, the Financial Accounting Standards Board (FASB) issued amendments to address and clarify the scope of the balance sheet off-setting disclosure guidance within Accounting Standards Codification (ASC) 210, “Balance Sheet.” ASU No. 2011-11 and ASU No. 2013-01, “Balance Sheet (Topic 210): Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities,” provide guidance that requires a reporting entity to disclose certain quantitative information concerning financial and derivative instruments that are offset in the balance sheet and a description of the rights of setoff, including the nature of such rights, associated with recognized assets and liabilities that are subject to an enforceable master netting arrangement or similar agreement. ASU No. 2013-01 clarifies that financial instruments subject to the disclosure guidance are (1) derivatives accounted for in accordance with ASC 815, Derivatives and Hedging, (2) repurchase agreements and reverse purchase agreements and (3) securities borrowing and securities lending transactions that are either offset in accordance with ASC Section 210-20-45 or Section 815-10-45 or subject to an enforceable master netting arrangement or similar agreement. A reporting entity electing gross presentation of such assets and liabilities in its balance sheet will still be subject to the same disclosure requirements. Both ASUs are applicable for fiscal years beginning on or after January 1, 2013, interim periods within those fiscal years, and retrospectively for all comparative periods presented. The application of this guidance does not have a material impact on the Companies’ financial position, results of operations and liquidity. See Note K. In February 2013, the FASB issued amendments to improve the reporting of reclassifications out of accumulated OCI through ASU No. 2013-02, “Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” The amendments require an entity to provide information either on the face of the financial statements or in a single footnote on significant amounts reclassified out of accumulated OCI and the related income statement line items to the extent an amount is reclassified in its entirety to net income under U.S. GAAP. For significant items not reclassified to net income in their entirety, an entity is required to cross-reference to other disclosures that provide additional information. For public entities, the amendments are effective prospectively for reporting periods beginning after December 15, 2012. The application of this guidance does not have a material impact on the Companies’ financial position, results of operations and liquidity. See Note A.