Investment in Constellation Energy Nuclear Group, LLC (Tables)	3 Months Ended
Mar. 31, 2016
Exelon Generation Co L L C [Member]
Schedule of Equity Method Investments [Line Items]
Schedule of total equity in earnings of investment in CENG	March 31, 2016

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration