Stock-Based Compensation Plans (Exelon, Generation, ComEd, PECO and BGE) (Tables)

12 Months Ended

Dec. 31, 2015

Common Stock [Abstract]

Schedule of Stock by Class

Stock Based Compensation Tax Benefit

The following table presents information regarding Exelon’s tax benefits for the years ended December 31, 2015, 2014 and 2013:

	Year Ended December 31,
	2015		2014		2013
Realized tax benefit when exercised/distributed:
Restricted stock units	$	30	$	17	$	11
Performance share awards	18		11		11
Stock deferral plan	—		—		1

Schedule of Assumptions Used

The following table presents the weighted average assumptions used in the pricing model for grants and the resulting weighted average grant date fair value of stock options granted for the year ended 2012:

	Year ended December 31, 2012
Dividend yield	5.28	%
Expected volatility	23.20	%
Risk-free interest rate	1.30	%
Expected life (years)	6.25
Weighted average grant date fair value (per share)	4.18

Schedule of Share-based Compensation, Stock Options, Activity

The following table presents information with respect to stock option activity for the year ended December 31, 2015:

	Shares		Weighted Average Exercise Price (per share)		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
Balance of shares outstanding at December 31, 2014	18,830,967		$	46.85
Options exercised	(7,133	)	21.25
Options forfeited	(5,250	)	39.81
Options expired	(3,245,827	)	47.75
Balance of shares outstanding at December 31, 2015	15,572,757		$	46.68	3.85	$	9
Exercisable at December 31, 2015 (a)	15,490,507		$	46.72	3.84	$	9

____________________

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

Stock Options Exercised

The following table summarizes additional information regarding stock options exercised for the years ended December 31, 2015, 2014 and 2013:

	Year Ended December 31,
	2015		2014		2013
Intrinsic value(a)	$	—	$	3	$	4
Cash received for exercise price	—		7		19

______________________

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

Schedule of Nonvested Share Activity

The following table summarizes Exelon’s nonvested stock option activity for the year ended December 31, 2015:

	Shares		Weighted Average Exercise Price (per share)
Nonvested at December 31, 2014 (a)	432,035		$	39.91
Vested	(344,535	)	39.93
Forfeited	(5,250	)	39.81
Nonvested at December 31, 2015 (a)	82,250		$	39.81

_____________________

(a) Excludes 279,000 and 746,140 of stock options issued to retirement-eligible employees as of December 31, 2015 and 2014, respectively, as they are fully vested.

Schedule of Nonvested Restricted Stock Units Activity

The following table summarizes Exelon’s nonvested restricted stock unit activity for the year ended December 31, 2015:

	Shares		Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2014 (a)	3,758,218		$	31.27
Granted	2,132,856		36.55
Vested	(1,597,255	)	32.88
Forfeited	(76,232	)	33.06
Undistributed vested awards (b)	(654,333	)	35.35
Nonvested at December 31, 2015 (a)	3,563,254		$	32.92

_______________________

(a) Excludes 1,097,630 and 975,116 of restricted stock units issued to retirement-eligible employees as of December 31, 2015 and 2014, respectively, as they are fully vested.

(b) Represents restricted stock units that vested but were not distributed to retirement-eligible employees during 2015.

Schedule of Nonvested Performance-based Units Activity

The following table summarizes Exelon’s nonvested performance share awards activity for the year ended December 31, 2015:

	Shares		Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2014 (a)	2,696,097		$	30.62
Granted	1,556,273		35.88
Change in performance	(118,398	)	35.88
Vested	(704,141	)	32.80
Forfeited	(52,167	)	32.25
Undistributed vested awards (b)	(820,505	)	33.95
Nonvested at December 31, 2015 (a)	2,557,159		$	31.88

_______________________ 

(a) Excludes 1,817,883 and 1,535,791 of performance share awards issued to retirement-eligible employees as of December 31, 2015 and 2014, respectively, as they are fully vested.

(b) Represents performance share awards that vested but were not distributed to retirement-eligible employees during 2015.

Not Settled Performance Share Awards Balance Sheet Presentation

The following table presents the balance sheet classification of obligations related to outstanding performance share awards not yet settled:

	December 31,
	2015		2014
Current liabilities(a)	$	28	$	28
Deferred credits and other liabilities(b)	32		36
Common stock	35		33
Total	$	95	$	97

__________________________ 

(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.

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

The following table presents the stock-based compensation expense included in Exelon’s Consolidated Statements of Operations and Comprehensive Income for the years ended December 31, 2015, 2014 and 2013:

	Year Ended December 31,
Components of Stock-Based Compensation Expense	2015			2014			2013
Performance share awards	$	41		$	59		$	48
Restricted stock units	71			61			61
Stock options	1			2			3
Other stock-based awards	6			5			6
Total stock-based compensation expense included in operating and maintenance expense	119			127			118
Income tax benefit	(46		)	(47		)	(44		)
Total after-tax stock-based compensation expense	$	73		$	80		$	74

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

The following table presents stock-based compensation expense (pre-tax) for the years ended December 31, 2015, 2014 and 2013:

	Year Ended December 31,
Subsidiaries	2015		2014		2013
Generation	$	64	$	52	$	48
ComEd	6		7		9
PECO	3		3		5
BGE	3		5		6
BSC(a)	43		60		50
Total	$	119	$	127	$	118

________________________

(a) 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.