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Stock-Based Compensation Plans (All Registrants) (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016 and 2015 and PHI's predecessor periods January 1, 2016 to March 23, 2016 and the year ended December 31, 2015:
Exelon
Year Ended
December 31,
Components of Stock-Based Compensation Expense
2017
 
2016(a)
 
2015
Performance share awards
$
107

 
$
93

 
$
41

Restricted stock units
77

 
75

 
71

Stock options
—

 
—

 
1

Other stock-based awards
7

 
7

 
6

Total stock-based compensation expense included in operating and maintenance expense
191

 
175

 
119

Income tax benefit
(74
)
 
(68
)
 
(46
)
Total after-tax stock-based compensation expense
$
117

 
$
107

 
$
73


__________
(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,
 
Year Ended
December 31,
Components of Stock-Based Compensation Expense
2016
 
2015
Time-based restricted stock units
$
2

 
$
7

Performance-based restricted stock units
1

 
5

Time-based restricted stock awards
—

 
1

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

 
13

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

 
$
8
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, 2017, 2016 and 2015, as well as for the PHI predecessor periods January 1, 2016 to March 23, 2016 and the year ended December 31, 2015:
 
Year Ended
December 31,
Subsidiaries
2017
 
2016
 
2015
Exelon
$
191

 
$
175

 
$
119

Generation
88

 
78

 
64

ComEd
7

 
8

 
6

PECO
3

 
3

 
3

BGE
1

 
1

 
3

BSC(a)
88

 
81

 
43

PHI Successor(b)(c)
4

 
4

 
—

 
Predecessor
 
January 1 to
March 23,
 
For the Year Ended December 31,
 
2016
 
2015
PHI
$
3

 
$
13

__________
(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 years ended December 31, 2017 and 2016 was not material.
(c)
Stock Based Compensation Tax Benefit
The following tables present information regarding Exelon’s and PHI's tax benefits for the years ended December 31, 2017, 2016 and 2015 and PHI's predecessor periods January 1, 2016 to March 23, 2016 and the year ended December 31, 2015:
Exelon
Year Ended December 31,
 
2017
 
2016
 
2015
Realized tax benefit when exercised/distributed:
 
 
 
 
 
Restricted stock units
35

 
27

 
30

Performance share awards
29

 
18

 
18


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

 
$
2

Performance-based restricted stock units
—

 
5
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, 2017:
 
Shares
 
Weighted
Average
Exercise
Price
(per share)
 
Weighted
Average
Remaining
Contractual
Life
(years)
 
Aggregate
Intrinsic
Value
Balance of shares outstanding at December 31, 2016
12,531,591

 
$
46.23

 
3.50
 
$
13

Options exercised
(3,093,156
)
 
34.69

 
 
 
 
Options forfeited
—

 
—

 
 
 
 
Options expired
(2,714,824
)
 
55.78

 
 
 
 
Balance of shares outstanding at December 31, 2017
6,723,611

 
$
47.69

 
2.65
 
$
7

Exercisable at December 31, 2017(a)
6,723,611

 
$
47.69

 
2.65
 
$
7

__________
(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, 2017, 2016 and 2015:
 
Year Ended
December 31,
 
2017
 
2016
 
2015
Intrinsic value(a)
$
15

 
$
11

 
$
—

Cash received for exercise price
107

 
19

 
—

__________
(a)
The difference between the market value on the date of exercise and the option exercise price.
Schedule of Nonvested Share Activity
.
Schedule of Nonvested Restricted Stock Units Activity
The following table summarizes Exelon’s nonvested restricted stock unit activity for the year ended December 31, 2017:
Exelon
 
Shares
 
Weighted Average
Grant Date Fair
Value (per share)
Nonvested at December 31, 2016(a)(c)
3,824,416

 
$
30.49

Granted
2,266,199

 
34.98

Vested
(1,736,965
)
 
30.98

Forfeited
(92,938
)
 
33.12

Undistributed vested awards (b)
(871,209
)
 
34.09

Nonvested at December 31, 2017(a)
3,389,503

 
$
32.24

__________
(a)
Excludes 1,488,383 and 1,319,372 of restricted stock units issued to retirement-eligible employees as of December 31, 2017 and 2016, respectively, as they are fully vested.
(b)
Represents restricted stock units that vested but were not distributed to retirement-eligible employees during 2017.
Schedule of Nonvested Performance-based Units Activity
The following table summarizes Exelon’s nonvested performance share awards activity for the year ended December 31, 2017:
Exelon 
 
Shares
 
Weighted Average
Grant Date Fair
Value (per share)
Nonvested at December 31, 2016(a)(c)
3,116,261

 
$
30.77

Granted
1,632,186

 
35.00

Change in performance
545,793

 
30.97

Vested
(1,111,751
)
 
29.11

Forfeited
(18,034
)
 
33.74

Undistributed vested awards (b)
(1,207,489
)
 
33.46

Nonvested at December 31, 2017(a)
2,956,966

 
$
32.65

__________
(a)
Excludes 2,723,440 and 2,443,409 of performance share awards issued to retirement-eligible employees as of December 31, 2017 and 2016, respectively, as they are fully vested.
(b)
Represents performance share awards that vested but were not distributed to retirement-eligible employees during 2017.
(c)
2016 amounts include activity related to stock-based compensation granted to eligible PHI employees since the merger date of March 23, 2016.
The following table summarizes the weighted average grant date fair value and the fair value of performance share awards granted and settled for the years ended December 31, 2017, 2016 and 2015:
 
Year Ended
December 31,
 
2017(a)
 
2016
 
2015
Weighted average grant date fair value (per share)
$
35.00

 
$
28.85

 
$
35.88

Fair value of performance shares settled
72

 
45

 
46

Fair value of performance shares settled in cash
56

 
28

 
29

__________
(a)
As of December 31, 2017, $41 million of total unrecognized compensation costs related to nonvested performance shares are expected to be recognized over the remaining weighted-average period of 1.5 years.
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,
 
2017
 
2016
Current liabilities(a)
$
57

 
$
49

Deferred credits and other liabilities(b)
100

 
52

Common stock
26

 
40

Total
$
183

 
$
141

__________
(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.