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Recently Issued Accounting Standards, Not Yet Adopted	3 Months Ended
Recently Issued Accounting Standards, Not Yet Adopted	Mar. 31, 2014
Recently Issued Accounting Standards, Not Yet Adopted	(4) RECENTLY ISSUED ACCOUNTING STANDARDS, NOT YET ADOPTED New accounting pronouncements not yet effective are not expected to have a material effect on PHI’s consolidated financial statements.
Potomac Electric Power Co [Member]
Recently Issued Accounting Standards, Not Yet Adopted	(4) RECENTLY ISSUED ACCOUNTING STANDARDS, NOT YET ADOPTED New accounting pronouncements not yet effective are not expected to have a material effect on Pepco’s financial statements.
Delmarva Power & Light Co/De [Member]
Recently Issued Accounting Standards, Not Yet Adopted	(4) RECENTLY ISSUED ACCOUNTING STANDARDS, NOT YET ADOPTED New accounting pronouncements not yet effective are not expected to have a material effect on DPL’s financial statements.
Atlantic City Electric Co [Member]
Recently Issued Accounting Standards, Not Yet Adopted	(4) RECENTLY ISSUED ACCOUNTING STANDARDS, NOT YET ADOPTED New accounting pronouncements not yet effective are not expected to have a material effect on ACE’s consolidated financial statements.