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Stock-Based Compensation Plans (All Registrants) (Tables)
 12 Months Ended
Dec. 31, 2016
Common Stock [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The following tables present the stock-based compensation expense included in Exelon's and PHI’s Consolidated Statements of Operations and Comprehensive Income for the years ended December 31, 2016, 2015 and 2014, as well as for the PHI predecessor period January 1, 2016 to March 23, 2016:
 
Exelon
Year Ended
December 31,
Components of Stock-Based Compensation Expense
2016(a)
 
2015
 
2014
Performance share awards
$
93

 
$
41

 
$
59

Restricted stock units
75

 
71

 
61

Stock options
—

 
1

 
2

Other stock-based awards
7

 
6

 
5

Total stock-based compensation expense included in operating and
maintenance expense
175

 
119

 
127

Income tax benefit
(68
)
 
(46
)
 
(47
)
Total after-tax stock-based compensation expense
$
107

 
$
73

 
$
80


 ____________________
(a)
2016 amounts include expense related to stock-based compensation granted to eligible PHI employees since the merger date of March 23, 2016.

PHI
 
Predecessor
 
January 1 to March 23,
 
Years Ended
December 31,
Components of Stock-Based Compensation Expense
2016
 
2015
 
2014
Time-based restricted stock units
$
2

 
$
7

 
$
5

Performance-based restricted stock units
1

 
5

 
8

Time-based restricted stock awards
—

 
1

 
5

Total stock-based compensation expense included in operating and
maintenance expense
3

 
13

 
18

Income tax benefit
(1
)
 
(5
)
 
(7
)
Total after-tax stock-based compensation expense
$
2

 
$
8

 
$
11
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The following tables present the Registrants' stock-based compensation expense (pre-tax) for the years ended December 31, 2016, 2015 and 2014, as well as for the PHI predecessor period January 1, 2016 to March 23, 2016:
 
 
Years Ended
December 31,
Subsidiaries
2016
 
2015
 
2014
Exelon
$
175

 
$
119

 
$
127

Generation
78

 
64

 
52

ComEd
8

 
6

 
7

PECO
3

 
3

 
3

BGE
1

 
3

 
5

BSC (a)
81

 
43

 
60

PHI (a)(b)
7

 
13

 
18


 
Successor
 
 
Predecessor
 
March 24 to
December 31,
 
 
January 1 to
March 23,
 
Years Ended
December 31,
 
2016
 
 
2016
 
2015
 
2014
PHI
$
4

 
 
$
3

 
$
13

 
$
18

____________________
(a)
These amounts primarily represent amounts billed to Exelon’s subsidiaries through intercompany allocations. These amounts are not included in the Generation, ComEd, PECO, BGE or PHI amounts above.
(b)
Pepco's, DPL's and ACE's stock-based compensation expense for the year ended December 31, 2016 and for the period January 1, 2016 through March 23, 2016 was not material. PHI's stock-based compensation expense for the year ended December 31, 2016 includes $3 million of costs incurred prior to the closing of Exelon’s merger with PHI on March 23, 2016.

Stock Based Compensation Tax Benefit
The following tables present information regarding Exelon’s and PHI's tax benefits for the years ended December 31, 2016, 2015 and 2014 and PHI's predecessor period January 1, 2016 to March 23, 2016:
 
Exelon
Years Ended December 31,
 
2016
 
2015
 
2014
Realized tax benefit when exercised/distributed:
 
 
 
 
 
Restricted stock units
$
27

 
$
30

 
$
17

Performance share awards
18

 
18

 
11


 
PHI
 
Predecessor
 
January 1 to
March 23,
 
Years Ended
December 31,
 
2016
 
2015
 
2014
Realized tax benefit when exercised/distributed:
 
 
 
 
 
Time-based restricted stock units
$
—

 
$
2

 
$
3

Performance-based restricted stock units
—

 
5

 
4

Time-based restricted stock awards
—

 
—

 
1
Schedule of Assumptions Used
 
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, 2016:
 
 
Shares
 
Weighted
Average
Exercise
Price
(per share)
 
Weighted
Average
Remaining
Contractual
Life
(years)
 
Aggregate
Intrinsic
Value
Balance of shares outstanding at December 31, 2015
15,572,757

 
$
46.68

 
 
 
 
Options exercised
(840,672
)
 
22.12

 
 
 
 
Options forfeited
—

 
—

 
 
 
 
Options expired
(2,200,494
)
 
58.60

 
 
 
 
Balance of shares outstanding at December 31, 2016
12,531,591

 
$
46.23

 
3.50
 
$
13

Exercisable at December 31, 2016 (a)
12,531,591

 
$
46.23

 
3.50
 
$
13

____________________
(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, 2016, 2015 and 2014:
 
 
Years Ended
December 31,
 
2016
 
2015
 
2014
Intrinsic value(a)
$
11

 
$
—

 
$
3

Cash received for exercise price
19

 
—

 
7

______________________
(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, 2016:
 
 
Shares
 
Weighted Average
Exercise Price
(per share)
Nonvested at December 31, 2015 (a)
82,250

 
$
39.81

Vested
(82,250
)
 
39.81

Nonvested at December 31, 2016 (a)
—

 
$
—

_____________________
(a)
Excludes 279,000 of stock options issued to retirement-eligible employees as of December 31, 2015 as they are fully vested.
Schedule of Nonvested Restricted Stock Units Activity
The following tables summarize Exelon’s and PHI's nonvested restricted stock unit activity for the year ended December 31, 2016 and PHI's for the predecessor period January 1, 2016 to March 23, 2016:
 
Exelon
 
Shares
 
Weighted Average
Grant Date Fair
Value (per share)
Nonvested at December 31, 2015 (a)
3,563,254

 
$
32.92

Granted
3,042,184

 
28.14

Vested
(1,797,536
)
 
32.44

Forfeited
(85,940
)
 
30.08

Undistributed vested awards (b)
(897,546
)
 
28.35

Nonvested at December 31, 2016 (a)(c)
3,824,416

 
$
30.49


PHI
 
Time-based Shares
 
Weighted Average
Grant Date Fair
Value (per share)
 
Performance-based Shares
 
Weighted Average
Grant Date Fair
Value (per share)
Nonvested at December 31, 2015
628,514

 
$
24.71

 
$
408,638

 
$
18.56

Granted
152,928

 
26.01

 
305,856

 
25.41

Vested
—

 
—

 
(4,950
)
 
26.08

Forfeited
—

 
—

 
(1,238
)
 
26.08

Nonvested at March 23, 2016
781,442

 
$
24.96

 
$
708,306

 
$
21.45

______________________
(a)
Excludes 1,319,372 and 975,116 of restricted stock units issued to retirement-eligible employees as of December 31, 2016 and 2015, respectively, as they are fully vested.
(b)
Represents restricted stock units that vested but were not distributed to retirement-eligible employees during 2016.
Schedule of Nonvested Performance-based Units Activity
The following tables summarize Exelon’s and PHI's nonvested performance share awards activity for the year ended December 31, 2016 and PHI's for the predecessor period January 1, 2016 to March 23, 2016:

Exelon 
 
Shares (c)
 
Weighted Average
Grant Date Fair
Value (per share)
Nonvested at December 31, 2015 (a)
2,557,159

 
$
31.88

Granted
2,319,407

 
28.85

Change in performance
627,303

 
30.04

Vested
(949,315
)
 
31.31

Forfeited
(70,876
)
 
30.90

Undistributed vested awards (b)
(1,367,417
)
 
28.33

Nonvested at December 31, 2016 (a)
3,116,261

 
$
30.77


PHI
 
Time-based Shares
 
Weighted Average
Grant Date Fair
Value (per share)
 
Performance-based Shares
 
Weighted Average
Grant Date Fair
Value (per share)
Nonvested at December 31, 2015
54,165

 
$
26.80

 
24,717

 
$
26.10

Vested
—

 
—

 
(24,717
)
 
26.10

Nonvested at March 23, 2016
54,165

 
$
26.80

 
—

 
$
—

________________ 
(a)
Excludes 2,443,409 and 1,817,883 of performance share awards issued to retirement-eligible employees as of December 31, 2016 and 2015, respectively, as they are fully vested.
(b)
Represents performance share awards that vested but were not distributed to retirement-eligible employees during 2016.
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,
 
2016
 
2015(c)
Current liabilities(a)
$
49

 
$
28

Deferred credits and other liabilities (b)
52

 
32

Common stock
40

 
35

Total
$
141

 
$
95

__________________________ 
(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.
(c)
Excludes $8 million of common stock for PHI at December 31, 2015.