Investment in Constellation Energy Nuclear Group, LLC (Tables) (Exelon Generation Co L L C [Member])

9 Months Ended

Sep. 30, 2014

Exelon Generation Co L L C [Member]

Schedule of Equity Method Investments [Line Items]

Schedule of total equity in earnings of investment in CENG

Generation recorded the assets and liabilities of CENG at fair value as of April 1, 2014. The following assets and liabilities of CENG were recorded within Generation’s Consolidated Balance Sheets as of the date of integration:

Preliminary Fair Values	Exelon and Generation
Current assets	$	499
Nuclear decommissioning trust fund	1,955
Property, plant and equipment	2,941
Nuclear fuel	482
Other assets	10
Total assets	5,887
Current liabilities	237
Asset retirement obligation	1,684
Pension and other employee benefit obligations	281
Unamortized energy contract liabilities	171
Other liabilities	114
Total liabilities	2,487
Total net assets	$	3,400