New Accounting Pronouncements (Exelon, Generation, ComEd and PECO)

9 Months Ended

Sep. 30, 2012

New Accounting Pronouncements And Changes In Accounting Principles Abstract

Schedule Of New Accounting Pronouncements And Changes In Accounting Principles [Text Block]

2.New Accounting Pronouncements (Exelon, Generation, ComEd, PECO and BGE)

The following recently issued accounting standard was adopted by the Registrants during the period.

Fair Value Measurement

In May 2011, the FASB issued authoritative guidance amending existing guidance for measuring and disclosing fair value. The new guidance does not impact the fair value measurements included in the Registrants' Consolidated Financial Statements as of September 30, 2012. The guidance is effective for the Registrants beginning with the period ended March 31, 2012 and is required to be applied prospectively. However, the Company updated the existing fair value disclosures during the first quarter of 2012 to comply with the requirements for this standard.See Note 7– Fair Value of Financial Assets and Liabilities for the new disclosures.