Mergers, Acquisitions and Dispositions (Tables)

12 Months Ended

Dec. 31, 2015

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition

The following table summarizes the acquisition-date fair value of the consideration transferred and the assets and liabilities assumed for the Integrys acquisition by Generation:

Total consideration transferred	$	332
Identifiable assets acquired and liabilities assumed
Working capital assets	$	390
Mark-to-market derivative assets	184
Unamortized energy contract assets	115
Customer relationships	50
Working capital liabilities	(196		)
Mark-to-market derivative liabilities	(57		)
Unamortized energy contract liabilities	(110		)
Deferred tax liability	(16		)
Total net identifiable assets, at fair value	$	360
Bargain purchase gain (after-tax)	$	28

Summary of Asset Divestitures

The table below presents the major classes of assets and liabilities held for sale at December 31, 2014. Assets held for sale at December 31, 2015 are not material.

	December 31, 2014
Assets
Property, plant and equipment, net (a)	$	143
Inventory	4
Total assets held for sale	$	147
Liabilities
Accrued expenses	$	1
Asset retirement obligations	4
Total liabilities held for sale (b)	$	5

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(a) The total aggregate book value of property, plant and equipment is net of a $50 million pre-tax impairment loss recorded within Operating and maintenance expense on Exelon’s and Generation’s Statements of Operations and Comprehensive Income for the year ended December 31, 2014. See Note 8 — Impairment of Long-Lived Assets for further information.

(b) Included within Other current liabilities on Exelon's and Generation's Consolidated Balance Sheets.

Station	Net Generation Capacity	Location	Operating Segment	Percent Owned
Fore River	726 MW	North Weymouth, MA	New England	100	%
West Valley	185 MW	Salt Lake City, UT	Other	100	%
Keystone	714 MW	Shelocta, PA	Mid-Atlantic	41.98	%
Conemaugh	532 MW	New Florence, PA	Mid-Atlantic	31.28	%
Safe Harbor	278 MW	Conestoga, PA	Mid-Atlantic	66.7	%
Quail Run	488 MW	Odessa, TX	ERCOT	100	%

Restructuring and Related Costs [Table Text Block]

	For the year ended,
Acquisition, Integration and Financing Costs(a)	2015		2014
Exelon	$	80	$	179
Generation	25		11
ComEd	10		4
PECO	5		2
BGE	5		2

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(a) The costs incurred are classified primarily within Operating and maintenance expense in the Registrants’ respective Consolidated Statement of Operations and Comprehensive Income, with the exception of the financing costs, which are included within Interest expense.

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