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Merger and Acquisitions (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]

Description		Payment Period	BGE		Generation		Exelon		Statement of Operations Location
BGE rate credit of $100 per residential customer (a)		Q2 2012	$	113	$	0	$	113	Revenues
Customer investment fund to invest in energy efficiency
	and low-income energy assistance to BGE customers	2012 to 2014		0		0		113.5	O&M Expense
Contribution for renewable energy, energy efficiency
	or related projects in Baltimore	2012 to 2014		0		0		2	O&M Expense
Charitable contributions at $7 million per year for 10 years		2012 to 2021		28		35		70	O&M Expense
State funding for offshore wind development projects		Q2 2012		0		0		32	O&M Expense
Miscellaneous tax benefits		Q2 2012		(2)		0		(2)	Taxes Other Than Income
	Total		$	139	$	35	$	328.5

Exelon made a $66 million equity contribution to BGE in the second quarter of 2012 to fund the after-tax amount of the rate credit as directed in the MDPSC order approving the merger transaction.

Schedule of Business Acquisitions by Acquisition, Equity Interest Issued or Issuable [Table Text Block]

	Number of Shares/ Awards Issued	Total Fair Value
Issuance of Exelon common stock to Constellation shareholders and equity award holders at the exchange ratio of 0.930 shares for each share of Constellation common stock; based on the opening price of Exelon common stock on March 12, 2012 of $38.91 (a)	187.45	$	7,294
Issuance of Exelon equity awards to replace existing Constellation equity awards (b)	11.30		71
Total purchase price		$	7,365

The number of shares issued excludes 0.7 million shares of stock that are held in a custodian account specifically for the settlement of unvested share-based restricted stock awards. The related share value is excluded from the estimated fair value as these awards have not vested and, therefore, are not in the purchase price.
Includes vested Constellation stock options and restricted stock units converted at fair value to Exelon awards on March 12, 2012. The fair value of the stock options was determined using the Black-Scholes model.

Schedule of Purchase Price Allocation [Table Text Block]

Preliminary Purchase Price Allocation, excluding amortization	Exelon		Generation
Current assets	$	4,936	$	3,638
Property, plant and equipment		9,342		4,054
Unamortized energy contracts		3,218		3,218
Other intangibles, trade name and retail relationships		457		457
Investment in affiliates		1,942		1,942
Pension and OPEB regulatory asset		740		0
Other assets		2,265		1,266
Total assets		22,900		14,575

Current liabilities		3,408		2,804
Unamortized energy contracts		1,722		1,512
Long-term debt, including current maturities		5,632		2,972
Noncontrolling interest		90		90
Deferred credits and other liabilities and preferred securities		4,683		1,933
Total liabilities, preferred securities and noncontrolling interest		15,535		9,311
Total purchase price	$	7,365	$	5,264

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

								Estimated amortization expense
Description	Weighted Average Amortization	Gross		Accumulated Amortization		Net		2013		2014		2015		2016		2017		2018 and Beyond
Unamortized energy contracts, net (a)	1.5	$	1,496	$	(982)	$	514	$	394	$	74	$	19	$	(31)	$	(22)	$	80
Trade name	10.0		243		(20)		223		24		24		24		24		24		103
Retail relationships	12.4		214		(15)		199		19		19		19		19		19		104

Total, net		$	1,953	$	(1,017)	$	936	$	437	$	117	$	62	$	12	$	21	$	287

(a) Includes the fair value of BGE's power and gas supply contracts for which an offsetting Exelon Corporate regulatory asset was also recorded.

Schedule of Restructuring and Related Costs [Text Block]

Year Ended December 31, 2012
Severance Benefits (a)		Exelon		Generation		ComEd (b)		PECO		BGE (c)
Severance charges	$	124	$	80	$	14	$	7	$	17
Stock compensation		7		4		1		0		1
Other charges		7		4		1		0		1
Total severance benefits	$	138	$	88	$	16	$	7	$	19

_________________

The amounts above include $46 million at Generation, $14 million at ComEd, $7 million at PECO, and $7 million at BGE, for amounts billed by BSC through intercompany allocations for the year ended December 31, 2012.
ComEd established regulatory assets of $16 million, as of December 31, 2012, for severance benefits costs. The majority of these costs are expected to be recovered over a five-year period.
Consistent with MDPSC precedent, BGE established a regulatory asset of $19 million, as of December 31, 2012, for severance benefits costs. The majority of these costs are expected to be recovered over a five-year period.

Schedule of Restructuring Reserve by Type of Cost [Table Text Block]

Year Ended December 31, 2012
Severance liability		Exelon		Generation		ComEd		PECO		BGE
Balance at December 31, 2011	$	0	$	0	$	0	$	0	$	0
Severance charges (a)		124		38		2		0		11
Stock compensation		7		2		0		0		0
Other charges (b)		7		2		0		0		1
Payments		(27)		(9)		(1)		0		(1)
Balance at December 31, 2012	$	111	$	33	$	1	$	0	$	11

Includes salary continuance and health and welfare severance benefits. Amounts represent ongoing severance plan benefits. Amounts also include one-time termination benefits of $3 million and $1 million for Exelon and Generation, respectively, which they began to recognize in the second quarter of 2012.
Primarily includes life insurance, employer payroll taxes, educational assistance, and outplacement services.

Business Acquisition, Pro Forma Information [Table Text Block]

	Generation				Exelon
		Year Ended December 31,				Year Ended December 31,
(unaudited)		2012		2011 (a)		2012		2011 (b)
Total Revenues	$	17,013	$	19,494	$	26,700	$	30,712
Net income attributable to Exelon		1,205		324		2,092		974

Basic Earnings Per Share		n.a.		n.a.	$	2.56	$	1.15
Diluted Earnings Per Share		n.a.		n.a.		2.55		1.14

_________________

The amounts above include non-recurring costs directly related to the merger of $203 million for the year ended December 31, 2011.
The amounts above include non-recurring costs directly related to the merger of $236 million for the year ended December 31, 2011.

Schedule Of Business Acquisitions By Acquisition [Text Block]

		Acquisitions
		2011				2010
		Wolf Hollow		Antelope Valley		Exelon Wind
Fair value of consideration transferred
Cash	$	305	$	75	$	893
Plus: Gain on PPA settlement		6		-		-
Contingent consideration		-		-		32

Total fair value of consideration transferred	$	311	$	75	$	925

Recognized amounts of identifiable assets acquired and liabilities assumed

Property, plant and equipment	$	347	$	15	$	700
Inventory		5		-		-
Intangible assets ^(a)		-		190		224
Payable to First Solar, Inc. ^(b)		-		(135)		-
Working capital, net		(5)		-		18
Asset retirement obligations		-		-		(13)
Noncontrolling interest		-				(3)
Other Assets		-		5		(1)

Total net identifiable assets	$	347	$	75	$	925

Bargain purchase gain	$	36	$	-	$	-

(a) See Note 8 - Intangible Assets for additional information.

(b) Generation concluded that the remaining, yet-to-be paid $135 million in consideration was embedded in the amounts payable under the Engineering, Procurement, Construction (EPC) agreement for First Solar, Inc. to construct the solar facility. For accounting purposes, this aspect of the transaction is considered to be akin to a "seller financing" arrangement. As such, Generation recorded a liability of $135 million associated with the portion of the future payments to First Solar, Inc. under the EPC agreement to reflect Generation's implicit amounts due First Solar, Inc. for the remainder of the value of the net assets acquired. The $135 million payable to First Solar, Inc. will be relieved as Generation makes payments for costs incurred over the project construction period. At December 31, 2012, $87 million remained payable to First Solar, Inc.

- Definition

Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate.

+ References+ Details

- Definition

Tabular disclosure of the equity interest issued or issuable in a business acquisition (or series of individually immaterial business acquisitions) planned, initiated, or completed during the period.

+ References+ Details

- Definition

Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph F4

-Subparagraph e

-Appendix F

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1486-128463

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Tabular disclosure of restructuring and related costs by type of restructuring including the description of the restructuring costs, such as the expected cost; the costs incurred during the period; the cumulative costs incurred as of the balance sheet date; the income statement caption within which the restructuring charges recognized for the period are included; and changes to an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost.

+ References+ Details

- Definition

Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period.

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