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Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2013

Stock-Based Compensation Plans [Line Items]

Stock Based Compensation Components [Text Block]

		Year Ended
		December 31,

Components of Stock-Based Compensation Expense		2013		2012		2011

Performance share awards		$	48	$	46	$	26
Restricted stock units			61		50		31
Stock options			3		15		8
Other stock-based awards			6		4		4

Total stock-based compensation expense included in
	operating and maintenance expense		118		115		69

Income tax benefit			(44)		(44)		(27)

Total after-tax stock-based compensation expense		$	74	$	71	$	42

Stock Based Compensation Expense Subsidiaries [Text Block]

	Year Ended
	December 31,

Subsidiaries	2013		2012		2011^(d)

Generation	$	48	$	42	$	31
ComEd		9		11		5
PECO		5		5		5
BGE^(a)		6		5		6
BSC^(b)		50		52		28

Total ^(c)	$	118	$	115	$	69

(a) BGE's stock-based compensation expense (pre-tax) for December 31, 2012 excludes $2 million of cost incurred in 2012 prior to the closing of Exelon's merger with Constellation on March 12, 2012. This amount is not included in Exelon's stock-based compensation expense for the year ended December 31, 2012 shown in the tables titled Components of Stock-Based Compensation Expense and Subsidiaries above.

(b) These amounts primarily represent amounts billed to Exelon's subsidiaries through intercompany allocations. These amounts are not included in the Generation, ComEd, PECO and BGE amounts above.

(c) The stock-based compensation expense (pre-tax) for December 31, 2013 reflects the impact of changes to the retirement eligibility requirements for employees participating in the LTIP. In addition, the stock-based compensation expense at ComEd does not reflect the impact of the ComEd Key Manager Long-Term Performance Program in 2013 for certain employees, which is not considered stock-based compensation expense under the applicable authoritative guidance. In 2012, these employees participated in the Exelon Restricted Stock Award Program.

(d) The total stock-based compensation expense (pre-tax) for December 31, 2011 of $69 million does not include the $6 million expense for BGE as those costs were incurred prior to the closing of Exelon's merger with Constellation on March 12, 2012.

Stock Based Compensation Tax Benefit [Text Block]

			Year Ended
			December 31,

			2013		2012		2011
Realized tax benefit when exercised/distributed:

		Stock options	$	0	$	3	$	2
		Restricted stock units		11		11		8
		Performance share awards		11		7		7
		Stock deferral plan		1		0		1

Excess tax benefits included in other financing activities of Exelon’s
	Consolidated Statements of Cash Flows:
		Stock options	$	0	$	2	$	1

Weighted Average Assumptions And Grand Date Fair Value Of Stock Options [Text Block]

	Year Ended December 31,

		2012			2011

Dividend yield			5.28	%		4.84	%
Expected volatility			23.20	%		24.40	%
Risk-free interest rate			1.30	%		2.65	%
Expected life (years)			6.25			6.25
Weighted average grant date fair value (per share)		$	4.18		$	6.22

Stock Option Activity [Text Block]

		Weighted		Weighted
		Average		Average
		Exercise		Remaining
		Price		Contractual	Aggregate
		(per		Life	Intrinsic
	Shares	share)		(years)	Value

Balance of shares outstanding at December 31, 2012	21,903,781	$	45.91
Options reinstated	751,122		38.60
Options exercised	(670,957)		28.02
Options forfeited	(54,743)		39.36
Options expired	(893,758)		49.08

Balance of shares outstanding at December 31, 2013	21,035,445	$	46.07	4.72	$	10

Exercisable at December 31, 2013 (a)	20,188,327	$	46.31	4.58	$	10

(a) Includes stock options issued to retirement eligible employees.

Stock Options Exercised [Text Block]

	Year Ended
	December 31,

	2013		2012		2011

Intrinsic value^(a)	$	4	$	19	$	5
Cash received for exercise price		19		47		13

(a) The difference between the market value on the date of exercise and the option exercise price.

Non Vested Stock Option [Text Block]


		Weighted Average
		Exercise Price
	Shares	(per share)

Nonvested at December 31, 2012 (a)	1,960,665	$	40.56
Vested	(1,058,804)		40.89
Forfeited	(54,743)		39.36

Nonvested at December 31, 2013 (a)	847,118	$	40.22

(a) Excludes 1,348,913 and 2,647,536 of stock options issued to retirement-eligible employees as of December 31, 2013 and December 31, 2012, respectively, as they are fully vested.

Non Vested Restricted Stock [Text Block]


		Weighted Average
		Grant Date Fair
	Shares	Value (per share)

Nonvested at December 31, 2012 (a)	2,029,161	$	42.12
Granted	2,828,187		31.06
Vested	(842,439)		42.90
Forfeited	(108,199)		36.37
Undistributed vested awards (b)	(520,013)		32.62

Nonvested at December 31, 2013 (a)	3,386,697	$	34.10

(a) Excludes 931,628 and 686,121 of restricted stock units issued to retirement-eligible employees as of December 31, 2013 and December 31, 2012, respectively, as they are fully vested.

(b) Represents restricted stock units that vested but were not distributed to retirement-eligible employees during 2013.

Non Vested Performance Shares [Text Block]


		Weighted Average
		Grant Date Fair
	Shares	Value (per share)

Nonvested at December 31, 2012 (a)	1,312,734	$	40.08
Granted	2,629,171		31.55
Vested	(612,624)		40.13
Forfeited	(24,451)		32.17
Undistributed vested awards (b)	(1,290,640)		34.28

Nonvested at December 31, 2013 (a)	2,014,190	$	32.74

(a) Excludes 1,411,824 and 204,643 of performance share awards issued to retirement-eligible employees as of December 31, 2013 and December 31, 2012, respectively, as they are fully vested.

(b) Represents performance share awards that vested but were not distributed to retirement-eligible employees during 2013.

Not Settled Performance Share Awards Balance Sheet Presentation [Text Block]


	December 31,

	2013		2012

Current liabilities^(a)	$	13	$	7
Deferred credits and other liabilities^(b)		24		11
Common stock		32		35

Total	$	69	$	53

(a) Represents the current liability related to performance share awards expected to be settled in cash.

(b) Represents the long-term liability related to performance share awards expected to be settled in cash.