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Stock-Based Compensation Plans Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Common Stock [Abstract]  
Share-based Payment Arrangement, Cost by Plan [Table Text Block]
The following table presents the stock-based compensation expense included in Exelon's and Generation's Consolidated Statements of Operations and Comprehensive Income. The Utility Registrants' stock-based compensation expense for the years ended December 31, 2019, 2018 and 2017 was not material.
Exelon
Year Ended December 31,
Components of Stock-Based Compensation Expense
2019
 
2018
 
2017
Total stock-based compensation expense included in operating and maintenance expense
$
77

 
$
208

 
$
191

Income tax benefit
(20
)
 
(54
)
 
(74
)
Total after-tax stock-based compensation expense
$
57

 
$
154

 
$
117

Generation
 
 
 
 
 
Components of Stock-Based Compensation Expense
 
 
 
 
 
Total stock-based compensation expense included in operating and maintenance expense
$
37

 
$
77

 
$
88

Income tax benefit
(10
)
 
(20
)
 
(34
)
Total after-tax stock-based compensation expense
$
27

 
$
57

 
$
54
Stock Based Compensation Tax Benefit The following table presents information regarding Exelon’s realized tax benefit when distributed:
 
Year Ended December 31,
 
2019
 
2018
 
2017
Performance share awards
$
41

 
$
16

 
$
29

Restricted stock units
24

 
28

 
35
Schedule of Nonvested Performance-based Units Activity
The following table summarizes Exelon’s nonvested performance share awards activity:
 
Shares
 
Weighted Average
Grant Date Fair
Value (per share)
Nonvested at December 31, 2018(a)
3,403,228

 
$
33.13

Granted
1,089,903

 
47.37

Change in performance
(799,618
)
 
40.85

Vested
(1,610,146
)
 
28.90

Forfeited
(25,249
)
 
45.03

Undistributed vested awards(b)
(348,363
)
 
48.82

Nonvested at December 31, 2019(a)
1,709,755

 
$
39.21

__________
(a)
Excludes 2,017,870 and 3,586,259 of performance share awards issued to retirement-eligible employees as of December 31, 2019 and 2018, respectively, as they are fully vested.
(b)
Represents performance share awards that vested but were not distributed to retirement-eligible employees during 2019.
The following table summarizes the weighted average grant date fair value and the total fair value of performance share awards granted and settled.
 
Year Ended December 31,
 
2019 (a)
 
2018
 
2017
Weighted average grant date fair value (per share)
$
47.37

 
$
38.15

 
$
35.00

Total fair value of performance shares settled
158

 
61

 
72

Total fair value of performance shares settled in cash
131

 
49

 
56

__________
(a)
As of December 31, 2019, $17 million of total unrecognized compensation costs related to nonvested performance shares are expected to be recognized over the remaining weighted-average period of 1.6 years.
Schedule of Nonvested Restricted Stock Units Activity
The following table summarizes Exelon’s nonvested restricted stock unit activity:
 
Shares
 
Weighted Average
Grant Date Fair
Value (per share)
Nonvested at December 31, 2018(a)
2,293,341

 
$
35.06

Granted
902,857

 
45.65

Vested
(1,232,704
)
 
32.83

Forfeited
(33,603
)
 
39.01

Undistributed vested awards (b)
(431,178
)
 
44.75

Nonvested at December 31, 2019(a)
1,498,713

 
$
40.35

__________
(a)
Excludes 863,196 and 1,131,487 of restricted stock units issued to retirement-eligible employees as of December 31, 2019 and 2018, respectively, as they are fully vested.
(b)
Represents restricted stock units that vested but were not distributed to retirement-eligible employees during 2019.
The following table summarizes the weighted average grant date fair value and the total fair value of restricted stock units granted and vested.
 
Year Ended December 31,
 
2019 (a)
 
2018
 
2017
Weighted average grant date fair value (per share)
$
45.65

 
$
38.60

 
$
34.98

Total fair value of restricted stock units vested
92

 
106

 
88

__________
(a)
As of December 31, 2019, $28 million of total unrecognized compensation costs related to nonvested restricted stock units are expected to be recognized over the remaining weighted-average period of 2.8 years.
Schedule of Share-based Compensation, Stock Options, Activity
The following table presents information with respect to stock option activity:
 
Shares
 
Weighted
Average
Exercise
Price
(per share)
 
Weighted
Average
Remaining
Contractual
Life
(years)
 
Aggregate
Intrinsic
Value
Balance of shares outstanding at December 31, 2018
4,027,652

 
$
43.95

 
2.90
 
$
14

Options exercised
(1,388,165
)
 
42.25

 
 
 
 
Options expired
(750,442
)
 
55.96

 
 
 
 
Balance of shares outstanding at December 31, 2019
1,889,045

 
$
40.43

 
1.56
 
$
10

Exercisable at December 31, 2019(a)
1,889,045

 
$
40.43

 
1.56
 
$
10

__________
(a)
Includes stock options issued to retirement eligible employees.
Stock Options Exercised
The following table summarizes additional information regarding stock options exercised:
 
Year Ended December 31,
 
2019
 
2018
 
2017
Intrinsic value(a)
$
9

 
$
12

 
$
15

Cash received for exercise price
59

 
56

 
107

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