Mergers, Acquisitions and Dispositions (Tables)

12 Months Ended

Dec. 31, 2018

Dec. 31, 2016

Business Combinations [Abstract]

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

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

Cash paid for purchase price	$	110
Cash paid for net cost reimbursement	125
Nuclear fuel transfer	54
Total consideration transferred	$	289
Identifiable assets acquired and liabilities assumed
Current assets	$	60
Property, plant and equipment	298
Nuclear decommissioning trust funds	807
Other assets(a)	114
Total assets	$	1,279
Current liabilities	$	6
Nuclear decommissioning ARO	444
Pension and OPEB obligations	33
Deferred income taxes	149
Spent nuclear fuel obligation	110
Other liabilities	15
Total liabilities	$	757
Total net identifiable assets, at fair value	$	522
Bargain purchase gain (after-tax)	$	233

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(a) Includes a $110 million asset associated with a contractual right to reimbursement from the New York Power Authority (NYPA), a prior owner of FitzPatrick, associated with the DOE one-time fee obligation. See Note 22-Commitments and Contingencies for additional information regarding SNF obligations to the DOE.

Business Combination, Separately Recognized Transactions [Table Text Block]

The following amounts represent total commitment costs for Exelon, PHI, Pepco, DPL and ACE that have been recorded since the merger date:

	Expected Payment Period			Successor
Description		Exelon		PHI		Pepco		DPL		ACE
Rate credits	2016 - 2021	$	259	$	264	$	91	$	72	$	101
Energy efficiency	2016 - 2021	117		—		—		—		—
Charitable contributions	2016 - 2026	50		50		28		12		10
Delivery system modernization	Q2 2017	22		—		—		—		—
Green sustainability fund	Q2 2017	14		—		—		—		—
Workforce development	2016 - 2020	17		—		—		—		—
Other		29		6		1		5		—
Total commitments		$	508	$	320	$	120	$	89	$	111
Remaining commitments as of December 31, 2018		$	128	$	92	$	73	$	12	$	7

Business Acquisition, Pro Forma Information [Table Text Block]

The current impact of PHI, including its unregulated businesses, in Exelon's Consolidated Statements of Operations and Comprehensive Income includes Operating revenues and Net Income (Loss) as follows:

	For the Years Ended December 31,
	2018	2017	2016
Operating Revenues	4,670	4,829	3,785
Net Income (Loss)	453	364	(66	)

Restructuring and Related Costs [Table Text Block]

For the periods ended December 31, 2018, 2017 and 2016, the Registrants have recognized costs to achieve the PHI merger as follows:

	For the Year Ended December 31,
Acquisition, Integration and Financing Costs(a)	2018		2017			2016
Exelon	$	7	$	16		$	143
Generation	5		22			37
ComEd(b)	—		1			(6		)
PECO	1		4			5
BGE(b)	1		4			(1		)
Pepco(b)	—		(6		)	28
DPL(b)	—		(7		)	20
ACE(b)	—		(6		)	19

	Successor							Predecessor
	For the Year Ended December 31,					March 24, 2016 to December 31, 2016		January 1, 2016 to March 23, 2016
Acquisition, Integration and Financing Costs(a)	2018		2017
PHI(b)	$	—	$	(18	)	$	69	$	29

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(a) The costs incurred are classified primarily within Operating and maintenance expense in the Registrants’ respective Consolidated Statements 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) For the year ended December 31, 2017, includes deferrals of previously incurred integration costs as regulatory assets of $24 million, $8 million, $8 million, and $8 million at PHI, Pepco, DPL and ACE, respectively. For the year ended December 31, 2016, includes deferrals of previously incurred integration costs as regulatory assets of $8 million, $6 million, $11 million and $4 million at ComEd, BGE, Pepco and DPL, respectively. For the Successor period March 24, 2016 to December 31, 2016, includes deferrals of previously incurred integration costs as regulatory assets of $16 million at PHI. See Note 4 - Regulatory Matters for additional information.

For the year ended December 31, 2016, the Registrants recorded the following severance costs associated with the identified job reductions within Operating and maintenance expense in their Consolidated Statements of Operations and Comprehensive Income:

Severance Benefits	Exelon		Generation		ComEd		PECO		BGE		PHI		Pepco		DPL		ACE
Severance costs(a)	$	57	$	9	$	2	$	1	$	1	$	44	$	21	$	13	$	10

(a) The amounts above for Generation, ComEd, PECO, BGE, Pepco, DPL, and ACE include $8 million, $2 million, $1 million, $1 million, $20 million, $12 million and $10 million, respectively, for amounts billed by BSC and/or PHISCO through intercompany allocations.

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

The unaudited pro-forma financial information has been presented for illustrative purposes only and is not necessarily indicative of results of operations that would have been achieved had the merger events taken place on the dates indicated, or future consolidated results of operations of the combined company.

	Year Ended December 31,
	2016(a)		2015(b)
Total operating revenues	$	32,342	$	33,823
Net income attributable to common shareholders	1,562		2,618
Basic earnings per share	$	1.69	$	2.85
Diluted earnings per share	1.69		2.84

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(a) The amounts above exclude non-recurring costs directly related to the merger of $680 million and intercompany revenue of $171 million for the year endedDecember 31, 2016.

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