Mergers, Acquisitions and Dispositions (Tables)

3 Months Ended

Mar. 31, 2016

Business Combinations [Abstract]

Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

	PHI		Exelon(a)
Beginning balance	$	—	$	2,672
Goodwill from business combination	4,016		4,016
Ending balance	$	4,016	$	6,688

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(a) As of March 31, 2016, there were no changes to the carrying amount of goodwill for ComEd and Generation, see Note 11— Intangible Assets of the Exelon 2015 Form 10-K for further information.

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Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block]

	Three Months Ended March 31,				Year Ended December 31,
	2016(a)		2015(b)		2015(c)
Total operating revenues	$	8,556	$	10,062	$	33,823
Net income attributable to common shareholders	577		800		2,618
Basic earnings per share	$	0.63	$	0.87	$	2.85
Diluted earnings per share	0.62		0.87		2.84

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(a) The amounts above exclude non-recurring costs directly related to the merger of $639 million and intercompany revenue of $170 million for the three months ended March 31, 2016.

(b) The amounts above exclude non-recurring costs directly related to the merger of $116 million and intercompany revenue of $122 million for the three months ended March 31, 2015.

(c) The amounts above exclude non-recurring costs directly related to the merger of $92 million and intercompany revenue of $559 million for the year ended December 31, 2015.

Business Combination, Separately Recognized Transactions [Table Text Block]

(In millions of dollars, except per share data)	Total Consideration
Cash paid to PHI shareholders at $27.25 per share (254 million shares outstanding at March 23, 2016)	$	6,933
Cash paid for PHI preferred stock(a)	180
Cash paid for PHI stock-based compensation equity awards(b)	29
Total purchase price	$	7,142

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(a) As of December 31, 2015, the preferred stock was included in Other non-current assets on Exelon's Consolidated Balance Sheet.

(b) PHI’s unvested time-based restricted stock units and performance-based restricted stock units issued prior to April 29, 2014 were immediately vested and paid in cash upon the close of the merger.  PHI’s remaining unvested time-based restricted stock units as of the close of the merger were cancelled.  There were no remaining unvested performance-based restricted stock units as of the close of the merger. 

								Successor
Description	Expected Payment Period	Pepco		DPL		ACE		PHI		Exelon
Customer bill credit	2016 - 2017	$	65	$	58	$	62	$	185	$	185
Energy efficiency	2016 - 2021	—		—		—		—		64
Charitable contributions	2016 - 2026	28		12		10		50		50
Customer base rate credit	2016 - 2019	26		—		—		26		26
Delivery system modernization	Q2 2016	—		—		—		—		22
Green sustainability fund	Q2 2016	—		—		—		—		14
Workforce development	2016 - 2020	—		—		—		—		11
Most favored nation		19		32		48		99		129
Other		1		2		—		3		7
Total		$	139	$	104	$	120	$	363	$	508

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

Preliminary Purchase Price Allocation
Current assets	$	2,107
Property, plant and equipment	11,071
Regulatory assets	5,118
Other assets	656
Goodwill	4,016
Total assets	22,968
Current liabilities	3,425
Unamortized energy contracts	1,550
Regulatory liabilities	297
Long-term debt, including current maturities	6,076
Deferred income taxes	3,441
Pension and OPEB liability	846
Other liabilities	191
Total liabilities	15,826
Total purchase price	$	7,142

Restructuring and Related Costs

	Three Months Ended March 31,
Acquisition, Integration and Financing Costs(a)	2016			2015
Exelon	$	102		$	108
Generation	16			7
ComEd(b)	(8		)	3
PECO	2			1
BGE	2			1
Pepco	27			1
DPL	16			1
ACE	13			1

	Successor		Predecessor
Acquisition, Integration and Financing Costs(a)	March 24, 2016 to March 31, 2016		January 1, 2016 to March 23, 2016		Three Months Ended March 31, 2015
PHI	$	56	$	29	$	8

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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. Costs do not include merger commitments discussed above.

(b) Excludes acquisition, integration and financing costs of $9 million incurred at ComEd that have been recorded as a regulatory asset.

											Successor
	Exelon		Generation		ComEd		PECO		BGE		PHI		Pepco		DPL		ACE
Severance benefits(a)	$	52	$	10	$	2	$	1	$	1	$	37	$	18	$	11	$	8

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(a) The amounts above for Generation, ComEd, PECO, BGE, Pepco, DPL and ACE include $9 million, $2 million, $1 million, $1 million, $18 million, $11 million and $8 million, respectively, for amounts billed by BSC and/or PHISCO through intercompany allocations for the three months ended March 31, 2016.