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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Line Items]  
Stock-Based Compensation, Plan Award Limits
The following table details the award limits under each of the Plans.
 
 
Total Plan
 
Annual Grant Limit
Total As % of
Outstanding
 
Annual Grant
 
Annual Grant Limit
For Individual Participants -
Performance Based Awards
 
 
Award
Limit
 
PPL Common Stock
On First Day of
 
Limit
Options
 
For awards
denominated in
 
For awards
denominated in
Plan
 
(Shares)
 
Each Calendar Year
 
(Shares)
 
shares (Shares)
 
cash (in dollars)
SIP
 
15,000,000

 
 
 
2,000,000

 
750,000

 
$
15,000,000

ICPKE
 
14,199,796

 
2
%
 
3,000,000

 
 

 
 
Restricted Stock and Restricted Stock Units, Weighted Average Grant Date Fair Value
The weighted-average grant date fair value of restricted stock units granted was:
 
2019
 
2018
 
2017
PPL
$
31.95

 
$
30.58

 
$
35.30

PPL Electric
32.33

 
30.00

 
35.45

LKE
30.65

 
30.98

 
35.25
Restricted Stock and Restricted Stock Units, Activity Rollforward
Restricted stock unit activity for 2019 was:
 
Restricted
Shares/Units
 
Weighted-
Average
Grant Date Fair
Value Per Share
PPL
 
 
 
Nonvested, beginning of period
1,098,203

 
$
33.45

Granted
479,428

 
31.95

Vested
(429,258
)
 
33.64

Forfeited
(10,688
)
 
31.53

Nonvested, end of period
1,137,685

 
32.76

 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
187,337

 
$
33.09

Transfer between registrants
(3,305
)
 
33.06

Granted
112,138

 
32.33

Vested
(59,661
)
 
33.77

Forfeited
(6,649
)
 
31.01

Nonvested, end of period
229,860

 
32.61

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
133,030

 
$
33.45

Granted
76,256

 
30.65

Vested
(42,841
)
 
33.75

Nonvested, end of period
166,445

 
32.09
Restricted Stock and Restricted Stock Units, Total Fair Value Vested at Year End
The total fair value of restricted stock units vesting for the years ended December 31 was:
 
2019
 
2018
 
2017
PPL
$
13

 
$
16

 
$
20

PPL Electric
2

 
2

 
3

LKE
1

 
5

 
4
Performance Units, Valuation Assumptions
The weighted-average assumptions used in the model were:
 
2019
 
2018
 
2017
Expected stock volatility
17.57
%
 
17.60
%
 
17.40
%
Expected life
3 years

 
3 years

 
3 years
Performance Units, Weighted Average Grant Date Fair Value
The weighted-average grant date fair value of TSR performance units granted was:
 
2019
 
2018
 
2017
PPL
$
35.83

 
$
38.26

 
$
38.38

PPL Electric
35.68

 
38.37

 
38.37

LKE
35.93

 
38.32

 
38.24


The weighted-average grant date fair value of ROE performance units granted was:
 
2019
 
2018
 
2017
PPL
$
30.89

 
$
32.21

 
$
32.42

PPL Electric
30.76

 
32.32

 
34.41

LKE
30.99

 
32.28

 
34.29
Performance Units, Activity Rollforward
TSR performance unit activity for 2019 was:
 
TSR Performance Units
 
Weighted-
Average Grant
Date Fair Value
Per Share
PPL
 
 
 
Nonvested, beginning of period
840,124

 
$
37.89

Granted
250,734

 
35.83

Forfeited (a)
(351,466
)
 
37.24

Nonvested, end of period
739,392

 
37.50

 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
67,863

 
$
37.86

Granted
24,158

 
35.68

Forfeited (a)
(25,222
)
 
36.92

Nonvested, end of period
66,799

 
37.43

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
148,996

 
$
37.81

Granted
39,453

 
35.93

Forfeited (a)
(57,916
)
 
37.02

Nonvested, end of period
130,533

 
37.60


(a)
Primarily related to the forfeiture of 2016 performance units as performance during the period was below the minimum established performance threshold, which resulted in no payout.

ROE performance unit activity for 2019 was:
 
ROE Performance Unit
 
Weighted-
Average Grant
Date Fair Value
Per Share
PPL
 
 
 
Nonvested, beginning of period
328,958

 
$
32.86

Granted
241,807

 
30.89

Nonvested, end of period
570,765

 
32.02

 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
25,960

 
$
32.96

Granted
23,234

 
30.76

Nonvested, end of period
49,194

 
31.92

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
69,620

 
$
32.87

Granted
38,185

 
30.99

Nonvested, end of period
107,805

 
32.20
Stock Options, Activity Rollforward
Stock option activity for 2019 was:
 
Number
of Options
 
Weighted
Average
Exercise
Price Per Share
 
Weighted-
Average
Remaining
Contractual
Term (years)
 
Aggregate
Total Intrinsic
Value
PPL
 
 
 
 
 
 
 
Outstanding at beginning of period
2,914,525

 
$
26.26

 
 
 
 
Exercised
(1,578,554
)
 
26.31

 
 
 
 
Forfeited
(5,028
)
 
28.77

 
 
 
 
Outstanding and exercisable at end of period
1,330,943

 
26.20

 
2.5
 
$
13
Compensation Costs for Restricted Stock, Restricted Stock Units, Performance Units and Stock Options
 
2019
 
2018
 
2017
PPL
$
35

 
$
25

 
$
32

PPL Electric
12

 
10

 
18

LKE
9

 
8

 
8



The income tax benefit related to above compensation expense was as follows:
 
2019
 
2018
 
2017
PPL
$
10

 
$
10

 
$
13

PPL Electric
3

 
3

 
8

LKE
2

 
2

 
3
Unrecognized Compensation Cost, Nonvested Restricted Stock, Restricted Stock Units, Performance Units and Stock Option Awards
At December 31, 2019, unrecognized compensation expense related to nonvested stock awards was:
 
Unrecognized
Compensation
Expense
 
Weighted-
Average
Period for
Recognition
PPL
$
14

 
1.9
PPL Electric
3

 
2.2
LKE
1

 
1.5
PPL Electric Utilities Corp [Member]  
Disclosure Of Compensation Related Costs Sharebased Payments [Line Items]  
Stock-Based Compensation, Plan Award Limits
The following table details the award limits under each of the Plans.
 
 
Total Plan
 
Annual Grant Limit
Total As % of
Outstanding
 
Annual Grant
 
Annual Grant Limit
For Individual Participants -
Performance Based Awards
 
 
Award
Limit
 
PPL Common Stock
On First Day of
 
Limit
Options
 
For awards
denominated in
 
For awards
denominated in
Plan
 
(Shares)
 
Each Calendar Year
 
(Shares)
 
shares (Shares)
 
cash (in dollars)
SIP
 
15,000,000

 
 
 
2,000,000

 
750,000

 
$
15,000,000

ICPKE
 
14,199,796

 
2
%
 
3,000,000

 
 

 
 
Restricted Stock and Restricted Stock Units, Weighted Average Grant Date Fair Value
The weighted-average grant date fair value of restricted stock units granted was:
 
2019
 
2018
 
2017
PPL
$
31.95

 
$
30.58

 
$
35.30

PPL Electric
32.33

 
30.00

 
35.45

LKE
30.65

 
30.98

 
35.25
Restricted Stock and Restricted Stock Units, Activity Rollforward
Restricted stock unit activity for 2019 was:
 
Restricted
Shares/Units
 
Weighted-
Average
Grant Date Fair
Value Per Share
PPL
 
 
 
Nonvested, beginning of period
1,098,203

 
$
33.45

Granted
479,428

 
31.95

Vested
(429,258
)
 
33.64

Forfeited
(10,688
)
 
31.53

Nonvested, end of period
1,137,685

 
32.76

 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
187,337

 
$
33.09

Transfer between registrants
(3,305
)
 
33.06

Granted
112,138

 
32.33

Vested
(59,661
)
 
33.77

Forfeited
(6,649
)
 
31.01

Nonvested, end of period
229,860

 
32.61

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
133,030

 
$
33.45

Granted
76,256

 
30.65

Vested
(42,841
)
 
33.75

Nonvested, end of period
166,445

 
32.09
Restricted Stock and Restricted Stock Units, Total Fair Value Vested at Year End
The total fair value of restricted stock units vesting for the years ended December 31 was:
 
2019
 
2018
 
2017
PPL
$
13

 
$
16

 
$
20

PPL Electric
2

 
2

 
3

LKE
1

 
5

 
4
Performance Units, Valuation Assumptions
The weighted-average assumptions used in the model were:
 
2019
 
2018
 
2017
Expected stock volatility
17.57
%
 
17.60
%
 
17.40
%
Expected life
3 years

 
3 years

 
3 years
Performance Units, Weighted Average Grant Date Fair Value
The weighted-average grant date fair value of TSR performance units granted was:
 
2019
 
2018
 
2017
PPL
$
35.83

 
$
38.26

 
$
38.38

PPL Electric
35.68

 
38.37

 
38.37

LKE
35.93

 
38.32

 
38.24


The weighted-average grant date fair value of ROE performance units granted was:
 
2019
 
2018
 
2017
PPL
$
30.89

 
$
32.21

 
$
32.42

PPL Electric
30.76

 
32.32

 
34.41

LKE
30.99

 
32.28

 
34.29
Performance Units, Activity Rollforward
ROE performance unit activity for 2019 was:
 
ROE Performance Unit
 
Weighted-
Average Grant
Date Fair Value
Per Share
PPL
 
 
 
Nonvested, beginning of period
328,958

 
$
32.86

Granted
241,807

 
30.89

Nonvested, end of period
570,765

 
32.02

 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
25,960

 
$
32.96

Granted
23,234

 
30.76

Nonvested, end of period
49,194

 
31.92

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
69,620

 
$
32.87

Granted
38,185

 
30.99

Nonvested, end of period
107,805

 
32.20



TSR performance unit activity for 2019 was:
 
TSR Performance Units
 
Weighted-
Average Grant
Date Fair Value
Per Share
PPL
 
 
 
Nonvested, beginning of period
840,124

 
$
37.89

Granted
250,734

 
35.83

Forfeited (a)
(351,466
)
 
37.24

Nonvested, end of period
739,392

 
37.50

 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
67,863

 
$
37.86

Granted
24,158

 
35.68

Forfeited (a)
(25,222
)
 
36.92

Nonvested, end of period
66,799

 
37.43

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
148,996

 
$
37.81

Granted
39,453

 
35.93

Forfeited (a)
(57,916
)
 
37.02

Nonvested, end of period
130,533

 
37.60


(a)
Primarily related to the forfeiture of 2016 performance units as performance during the period was below the minimum established performance threshold, which resulted in no payout.

Compensation Costs for Restricted Stock, Restricted Stock Units, Performance Units and Stock Options
 
2019
 
2018
 
2017
PPL
$
35

 
$
25

 
$
32

PPL Electric
12

 
10

 
18

LKE
9

 
8

 
8



The income tax benefit related to above compensation expense was as follows:
 
2019
 
2018
 
2017
PPL
$
10

 
$
10

 
$
13

PPL Electric
3

 
3

 
8

LKE
2

 
2

 
3
Unrecognized Compensation Cost, Nonvested Restricted Stock, Restricted Stock Units, Performance Units and Stock Option Awards
At December 31, 2019, unrecognized compensation expense related to nonvested stock awards was:
 
Unrecognized
Compensation
Expense
 
Weighted-
Average
Period for
Recognition
PPL
$
14

 
1.9
PPL Electric
3

 
2.2
LKE
1

 
1.5
LG And E And KU Energy LLC [Member]  
Disclosure Of Compensation Related Costs Sharebased Payments [Line Items]  
Stock-Based Compensation, Plan Award Limits
The following table details the award limits under each of the Plans.
 
 
Total Plan
 
Annual Grant Limit
Total As % of
Outstanding
 
Annual Grant
 
Annual Grant Limit
For Individual Participants -
Performance Based Awards
 
 
Award
Limit
 
PPL Common Stock
On First Day of
 
Limit
Options
 
For awards
denominated in
 
For awards
denominated in
Plan
 
(Shares)
 
Each Calendar Year
 
(Shares)
 
shares (Shares)
 
cash (in dollars)
SIP
 
15,000,000

 
 
 
2,000,000

 
750,000

 
$
15,000,000

ICPKE
 
14,199,796

 
2
%
 
3,000,000

 
 

 
 
Restricted Stock and Restricted Stock Units, Weighted Average Grant Date Fair Value
The weighted-average grant date fair value of restricted stock units granted was:
 
2019
 
2018
 
2017
PPL
$
31.95

 
$
30.58

 
$
35.30

PPL Electric
32.33

 
30.00

 
35.45

LKE
30.65

 
30.98

 
35.25
Restricted Stock and Restricted Stock Units, Activity Rollforward
Restricted stock unit activity for 2019 was:
 
Restricted
Shares/Units
 
Weighted-
Average
Grant Date Fair
Value Per Share
PPL
 
 
 
Nonvested, beginning of period
1,098,203

 
$
33.45

Granted
479,428

 
31.95

Vested
(429,258
)
 
33.64

Forfeited
(10,688
)
 
31.53

Nonvested, end of period
1,137,685

 
32.76

 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
187,337

 
$
33.09

Transfer between registrants
(3,305
)
 
33.06

Granted
112,138

 
32.33

Vested
(59,661
)
 
33.77

Forfeited
(6,649
)
 
31.01

Nonvested, end of period
229,860

 
32.61

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
133,030

 
$
33.45

Granted
76,256

 
30.65

Vested
(42,841
)
 
33.75

Nonvested, end of period
166,445

 
32.09
Restricted Stock and Restricted Stock Units, Total Fair Value Vested at Year End
The total fair value of restricted stock units vesting for the years ended December 31 was:
 
2019
 
2018
 
2017
PPL
$
13

 
$
16

 
$
20

PPL Electric
2

 
2

 
3

LKE
1

 
5

 
4
Performance Units, Valuation Assumptions
The weighted-average assumptions used in the model were:
 
2019
 
2018
 
2017
Expected stock volatility
17.57
%
 
17.60
%
 
17.40
%
Expected life
3 years

 
3 years

 
3 years
Performance Units, Weighted Average Grant Date Fair Value
The weighted-average grant date fair value of TSR performance units granted was:
 
2019
 
2018
 
2017
PPL
$
35.83

 
$
38.26

 
$
38.38

PPL Electric
35.68

 
38.37

 
38.37

LKE
35.93

 
38.32

 
38.24


The weighted-average grant date fair value of ROE performance units granted was:
 
2019
 
2018
 
2017
PPL
$
30.89

 
$
32.21

 
$
32.42

PPL Electric
30.76

 
32.32

 
34.41

LKE
30.99

 
32.28

 
34.29
Performance Units, Activity Rollforward
ROE performance unit activity for 2019 was:
 
ROE Performance Unit
 
Weighted-
Average Grant
Date Fair Value
Per Share
PPL
 
 
 
Nonvested, beginning of period
328,958

 
$
32.86

Granted
241,807

 
30.89

Nonvested, end of period
570,765

 
32.02

 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
25,960

 
$
32.96

Granted
23,234

 
30.76

Nonvested, end of period
49,194

 
31.92

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
69,620

 
$
32.87

Granted
38,185

 
30.99

Nonvested, end of period
107,805

 
32.20



TSR performance unit activity for 2019 was:
 
TSR Performance Units
 
Weighted-
Average Grant
Date Fair Value
Per Share
PPL
 
 
 
Nonvested, beginning of period
840,124

 
$
37.89

Granted
250,734

 
35.83

Forfeited (a)
(351,466
)
 
37.24

Nonvested, end of period
739,392

 
37.50

 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
67,863

 
$
37.86

Granted
24,158

 
35.68

Forfeited (a)
(25,222
)
 
36.92

Nonvested, end of period
66,799

 
37.43

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
148,996

 
$
37.81

Granted
39,453

 
35.93

Forfeited (a)
(57,916
)
 
37.02

Nonvested, end of period
130,533

 
37.60


(a)
Primarily related to the forfeiture of 2016 performance units as performance during the period was below the minimum established performance threshold, which resulted in no payout.
Compensation Costs for Restricted Stock, Restricted Stock Units, Performance Units and Stock Options
 
2019
 
2018
 
2017
PPL
$
35

 
$
25

 
$
32

PPL Electric
12

 
10

 
18

LKE
9

 
8

 
8



The income tax benefit related to above compensation expense was as follows:
 
2019
 
2018
 
2017
PPL
$
10

 
$
10

 
$
13

PPL Electric
3

 
3

 
8

LKE
2

 
2

 
3
Unrecognized Compensation Cost, Nonvested Restricted Stock, Restricted Stock Units, Performance Units and Stock Option Awards
At December 31, 2019, unrecognized compensation expense related to nonvested stock awards was:
 
Unrecognized
Compensation
Expense
 
Weighted-
Average
Period for
Recognition
PPL
$
14

 
1.9
PPL Electric
3

 
2.2
LKE
1

 
1.5