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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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:
 
2017
 
2016
 
2015
PPL
$
35.30

 
$
33.84

 
$
34.50

PPL Electric
35.45

 
34.32

 
34.41

LKE
35.25

 
33.73

 
34.89
Restricted Stock and Restricted Stock Units, Activity Rollforward
Restricted stock unit activity for 2017 was:
 
Restricted
Shares/Units
 
Weighted-
Average
Grant Date Fair
Value Per Share
PPL
 
 
 
Nonvested, beginning of period
1,337,025

 
$
31.57

Granted
538,441

 
35.30

Vested
(567,001
)
 
29.28

Forfeited
(16,816
)
 
34.28

Nonvested, end of period (a)
1,291,649

 
34.10

 
Restricted
Shares/Units
 
Weighted-
Average
Grant Date Fair
Value Per Share
 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
204,570

 
$
31.27

Transfer between registrants
(5,250
)
 
32.05

Granted
79,321

 
35.45

Vested
(91,117
)
 
28.83

Forfeited
(3,108
)
 
34.68

Nonvested, end of period
184,416

 
34.20

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
243,281

 
$
31.53

Transfer between registrants
25,337

 
31.61

Granted
97,775

 
35.25

Vested
(125,612
)
 
29.68

Forfeited
(9,224
)
 
34.04

Nonvested, end of period
231,557

 
34.01

 
(a)
Excludes 252,850 restricted stock units for which restrictions lapsed for former PPL Energy Supply employees as a result of the spinoff, but for which distribution will not occur until the end of the original restriction period of the awards.
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:
 
2017
 
2016
 
2015
PPL
$
20

 
$
30

 
$
28

PPL Electric
3

 
3

 
4

LKE
4

 
5

 
4
Performance Units, Valuation Assumptions
The weighted-average assumptions used in the model were:
 
2017
 
2016
 
2015
Expected stock volatility
17.40
%
 
19.60
%
 
15.90
%
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:
 
2017
 
2016
 
2015
PPL
$
38.38

 
$
35.74

 
$
36.76

PPL Electric
38.37

 
35.68

 
37.93

LKE
38.24

 
35.28

 
37.10
Performance Units, Activity Rollforward
TSR performance unit activity for 2017 was:
 
TSR Performance Units
 
Weighted-
Average Grant
Date Fair Value
Per Share
PPL
 
 
 
Nonvested, beginning of period
1,070,536

 
$
34.65

Granted
293,642

 
38.38

 
TSR Performance Units
 
Weighted-
Average Grant
Date Fair Value
Per Share
Vested
(243,983
)
 
32.42

Forfeited
(141,964
)
 
32.27

Nonvested, end of period (a)
978,231

 
36.67

 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
76,726

 
$
34.68

Granted
26,086

 
38.37

Vested
(14,713
)
 
32.14

Forfeited
(12,586
)
 
35.45

Nonvested, end of period
75,513

 
37.00

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
191,601

 
$
34.34

Transfer between registrants
8,307

 
35.96

Granted
64,555

 
38.24

Vested
(48,980
)
 
32.09

Forfeited
(35,194
)
 
35.25

Nonvested, end of period
180,289

 
36.69


(a)
Excludes 41,405 TSR awards for which the service vesting requirement was waived for former PPL Energy Supply employees as a result of the spinoff, but for which the ultimate number of shares to be distributed will depend on the actual attainment of the performance goals at the end of the specified performance periods.

ROE performance unit activity for 2017 was:
 
ROE Performance Unit
 
Weighted-
Average Grant
Date Fair Value
Per Share
PPL
 
 
 
Granted
97,925

 
$
34.42

Forfeited
(997
)
 
34.41

Nonvested, end of period
96,928

 
34.42

 
 
 
 
PPL Electric
 
 
 
Granted
8,696

 
$
34.41

Nonvested, end of period
8,696

 
34.41

 
 
 
 
LKE
 
 
 
Granted
21,536

 
$
34.29

Forfeited
(997
)
 
34.41

Nonvested, end of period
20,539

 
34.29
Stock Options, Activity Rollforward
Stock option activity for 2017 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
4,481,160

 
$
28.98

 
 
 
 
Exercised
(718,977
)
 
26.67

 
 
 
 
Outstanding and exercisable at end of period
3,762,183

 
29.42

 
3.5
 
$
14

 
 
 
 
 
 
 
 
PPL Electric
 
 
 
 
 
 
 
Outstanding at beginning of period
240,939

 
$
27.48

 
 
 
 
Exercised
(42,659
)
 
26.99

 
 
 
 
Outstanding and exercisable at end of period
198,280

 
27.58

 
3.8
 
$
1

 
Number
of Options
 
Weighted
Average
Exercise
Price Per Share
 
Weighted-
Average
Remaining
Contractual
Term (years)
 
Aggregate
Total Intrinsic
Value
 
 
 
 
 
 
 
 
LKE
 
 
 
 
 
 
 
Outstanding at beginning of period
61,896

 
$
25.81

 
 
 
 
Exercised
(28,164
)
 
26.59

 
 
 
 
Outstanding and exercisable at end of period
33,732

 
25.15

 
4.1
 
$
—
Compensation Costs for Restricted Stock, Restricted Stock Units, Performance Units and Stock Options
Compensation expense for restricted stock, restricted stock units, performance units and stock options accounted for as equity awards, which for PPL Electric and LKE includes an allocation of PPL Services' expense, was:
 
2017
 
2016
 
2015
PPL
$
32

 
$
27

 
$
33

PPL Electric
18

 
16

 
14

LKE
8

 
7

 
8


The income tax benefit related to above compensation expense was as follows:
 
2017
 
2016
 
2015
PPL
$
13

 
$
12

 
$
14

PPL Electric
8

 
7

 
6

LKE
3

 
3

 
3
Unrecognized Compensation Cost, Nonvested Restricted Stock, Restricted Stock Units, Performance Units and Stock Option Awards
At December 31, 2017, unrecognized compensation expense related to nonvested stock awards was:
 
Unrecognized
Compensation
Expense
 
Weighted-
Average
Period for
Recognition
PPL
$
10

 
1.7
PPL Electric
2

 
1.7
LKE
1

 
1.6
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:
 
2017
 
2016
 
2015
PPL
$
35.30

 
$
33.84

 
$
34.50

PPL Electric
35.45

 
34.32

 
34.41

LKE
35.25

 
33.73

 
34.89
Restricted Stock and Restricted Stock Units, Activity Rollforward
Restricted stock unit activity for 2017 was:
 
Restricted
Shares/Units
 
Weighted-
Average
Grant Date Fair
Value Per Share
PPL
 
 
 
Nonvested, beginning of period
1,337,025

 
$
31.57

Granted
538,441

 
35.30

Vested
(567,001
)
 
29.28

Forfeited
(16,816
)
 
34.28

Nonvested, end of period (a)
1,291,649

 
34.10

 
Restricted
Shares/Units
 
Weighted-
Average
Grant Date Fair
Value Per Share
 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
204,570

 
$
31.27

Transfer between registrants
(5,250
)
 
32.05

Granted
79,321

 
35.45

Vested
(91,117
)
 
28.83

Forfeited
(3,108
)
 
34.68

Nonvested, end of period
184,416

 
34.20

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
243,281

 
$
31.53

Transfer between registrants
25,337

 
31.61

Granted
97,775

 
35.25

Vested
(125,612
)
 
29.68

Forfeited
(9,224
)
 
34.04

Nonvested, end of period
231,557

 
34.01

 
(a)
Excludes 252,850 restricted stock units for which restrictions lapsed for former PPL Energy Supply employees as a result of the spinoff, but for which distribution will not occur until the end of the original restriction period of the awards.
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:
 
2017
 
2016
 
2015
PPL
$
20

 
$
30

 
$
28

PPL Electric
3

 
3

 
4

LKE
4

 
5

 
4
Performance Units, Valuation Assumptions
The weighted-average assumptions used in the model were:
 
2017
 
2016
 
2015
Expected stock volatility
17.40
%
 
19.60
%
 
15.90
%
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:
 
2017
 
2016
 
2015
PPL
$
38.38

 
$
35.74

 
$
36.76

PPL Electric
38.37

 
35.68

 
37.93

LKE
38.24

 
35.28

 
37.10
Performance Units, Activity Rollforward
TSR performance unit activity for 2017 was:
 
TSR Performance Units
 
Weighted-
Average Grant
Date Fair Value
Per Share
PPL
 
 
 
Nonvested, beginning of period
1,070,536

 
$
34.65

Granted
293,642

 
38.38

 
TSR Performance Units
 
Weighted-
Average Grant
Date Fair Value
Per Share
Vested
(243,983
)
 
32.42

Forfeited
(141,964
)
 
32.27

Nonvested, end of period (a)
978,231

 
36.67

 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
76,726

 
$
34.68

Granted
26,086

 
38.37

Vested
(14,713
)
 
32.14

Forfeited
(12,586
)
 
35.45

Nonvested, end of period
75,513

 
37.00

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
191,601

 
$
34.34

Transfer between registrants
8,307

 
35.96

Granted
64,555

 
38.24

Vested
(48,980
)
 
32.09

Forfeited
(35,194
)
 
35.25

Nonvested, end of period
180,289

 
36.69


(a)
Excludes 41,405 TSR awards for which the service vesting requirement was waived for former PPL Energy Supply employees as a result of the spinoff, but for which the ultimate number of shares to be distributed will depend on the actual attainment of the performance goals at the end of the specified performance periods.

ROE performance unit activity for 2017 was:
 
ROE Performance Unit
 
Weighted-
Average Grant
Date Fair Value
Per Share
PPL
 
 
 
Granted
97,925

 
$
34.42

Forfeited
(997
)
 
34.41

Nonvested, end of period
96,928

 
34.42

 
 
 
 
PPL Electric
 
 
 
Granted
8,696

 
$
34.41

Nonvested, end of period
8,696

 
34.41

 
 
 
 
LKE
 
 
 
Granted
21,536

 
$
34.29

Forfeited
(997
)
 
34.41

Nonvested, end of period
20,539

 
34.29
Stock Options, Activity Rollforward
Stock option activity for 2017 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
4,481,160

 
$
28.98

 
 
 
 
Exercised
(718,977
)
 
26.67

 
 
 
 
Outstanding and exercisable at end of period
3,762,183

 
29.42

 
3.5
 
$
14

 
 
 
 
 
 
 
 
PPL Electric
 
 
 
 
 
 
 
Outstanding at beginning of period
240,939

 
$
27.48

 
 
 
 
Exercised
(42,659
)
 
26.99

 
 
 
 
Outstanding and exercisable at end of period
198,280

 
27.58

 
3.8
 
$
1

 
Number
of Options
 
Weighted
Average
Exercise
Price Per Share
 
Weighted-
Average
Remaining
Contractual
Term (years)
 
Aggregate
Total Intrinsic
Value
 
 
 
 
 
 
 
 
LKE
 
 
 
 
 
 
 
Outstanding at beginning of period
61,896

 
$
25.81

 
 
 
 
Exercised
(28,164
)
 
26.59

 
 
 
 
Outstanding and exercisable at end of period
33,732

 
25.15

 
4.1
 
$
—
Compensation Costs for Restricted Stock, Restricted Stock Units, Performance Units and Stock Options
Compensation expense for restricted stock, restricted stock units, performance units and stock options accounted for as equity awards, which for PPL Electric and LKE includes an allocation of PPL Services' expense, was:
 
2017
 
2016
 
2015
PPL
$
32

 
$
27

 
$
33

PPL Electric
18

 
16

 
14

LKE
8

 
7

 
8


The income tax benefit related to above compensation expense was as follows:
 
2017
 
2016
 
2015
PPL
$
13

 
$
12

 
$
14

PPL Electric
8

 
7

 
6

LKE
3

 
3

 
3
Unrecognized Compensation Cost, Nonvested Restricted Stock, Restricted Stock Units, Performance Units and Stock Option Awards
At December 31, 2017, unrecognized compensation expense related to nonvested stock awards was:
 
Unrecognized
Compensation
Expense
 
Weighted-
Average
Period for
Recognition
PPL
$
10

 
1.7
PPL Electric
2

 
1.7
LKE
1

 
1.6
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:
 
2017
 
2016
 
2015
PPL
$
35.30

 
$
33.84

 
$
34.50

PPL Electric
35.45

 
34.32

 
34.41

LKE
35.25

 
33.73

 
34.89
Restricted Stock and Restricted Stock Units, Activity Rollforward
Restricted stock unit activity for 2017 was:
 
Restricted
Shares/Units
 
Weighted-
Average
Grant Date Fair
Value Per Share
PPL
 
 
 
Nonvested, beginning of period
1,337,025

 
$
31.57

Granted
538,441

 
35.30

Vested
(567,001
)
 
29.28

Forfeited
(16,816
)
 
34.28

Nonvested, end of period (a)
1,291,649

 
34.10

 
Restricted
Shares/Units
 
Weighted-
Average
Grant Date Fair
Value Per Share
 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
204,570

 
$
31.27

Transfer between registrants
(5,250
)
 
32.05

Granted
79,321

 
35.45

Vested
(91,117
)
 
28.83

Forfeited
(3,108
)
 
34.68

Nonvested, end of period
184,416

 
34.20

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
243,281

 
$
31.53

Transfer between registrants
25,337

 
31.61

Granted
97,775

 
35.25

Vested
(125,612
)
 
29.68

Forfeited
(9,224
)
 
34.04

Nonvested, end of period
231,557

 
34.01

 
(a)
Excludes 252,850 restricted stock units for which restrictions lapsed for former PPL Energy Supply employees as a result of the spinoff, but for which distribution will not occur until the end of the original restriction period of the awards.
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:
 
2017
 
2016
 
2015
PPL
$
20

 
$
30

 
$
28

PPL Electric
3

 
3

 
4

LKE
4

 
5

 
4
Performance Units, Valuation Assumptions
The weighted-average assumptions used in the model were:
 
2017
 
2016
 
2015
Expected stock volatility
17.40
%
 
19.60
%
 
15.90
%
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:
 
2017
 
2016
 
2015
PPL
$
38.38

 
$
35.74

 
$
36.76

PPL Electric
38.37

 
35.68

 
37.93

LKE
38.24

 
35.28

 
37.10
Performance Units, Activity Rollforward
TSR performance unit activity for 2017 was:
 
TSR Performance Units
 
Weighted-
Average Grant
Date Fair Value
Per Share
PPL
 
 
 
Nonvested, beginning of period
1,070,536

 
$
34.65

Granted
293,642

 
38.38

 
TSR Performance Units
 
Weighted-
Average Grant
Date Fair Value
Per Share
Vested
(243,983
)
 
32.42

Forfeited
(141,964
)
 
32.27

Nonvested, end of period (a)
978,231

 
36.67

 
 
 
 
PPL Electric
 
 
 
Nonvested, beginning of period
76,726

 
$
34.68

Granted
26,086

 
38.37

Vested
(14,713
)
 
32.14

Forfeited
(12,586
)
 
35.45

Nonvested, end of period
75,513

 
37.00

 
 
 
 
LKE
 
 
 
Nonvested, beginning of period
191,601

 
$
34.34

Transfer between registrants
8,307

 
35.96

Granted
64,555

 
38.24

Vested
(48,980
)
 
32.09

Forfeited
(35,194
)
 
35.25

Nonvested, end of period
180,289

 
36.69


(a)
Excludes 41,405 TSR awards for which the service vesting requirement was waived for former PPL Energy Supply employees as a result of the spinoff, but for which the ultimate number of shares to be distributed will depend on the actual attainment of the performance goals at the end of the specified performance periods.

ROE performance unit activity for 2017 was:
 
ROE Performance Unit
 
Weighted-
Average Grant
Date Fair Value
Per Share
PPL
 
 
 
Granted
97,925

 
$
34.42

Forfeited
(997
)
 
34.41

Nonvested, end of period
96,928

 
34.42

 
 
 
 
PPL Electric
 
 
 
Granted
8,696

 
$
34.41

Nonvested, end of period
8,696

 
34.41

 
 
 
 
LKE
 
 
 
Granted
21,536

 
$
34.29

Forfeited
(997
)
 
34.41

Nonvested, end of period
20,539

 
34.29
Stock Options, Activity Rollforward
Stock option activity for 2017 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
4,481,160

 
$
28.98

 
 
 
 
Exercised
(718,977
)
 
26.67

 
 
 
 
Outstanding and exercisable at end of period
3,762,183

 
29.42

 
3.5
 
$
14

 
 
 
 
 
 
 
 
PPL Electric
 
 
 
 
 
 
 
Outstanding at beginning of period
240,939

 
$
27.48

 
 
 
 
Exercised
(42,659
)
 
26.99

 
 
 
 
Outstanding and exercisable at end of period
198,280

 
27.58

 
3.8
 
$
1

 
Number
of Options
 
Weighted
Average
Exercise
Price Per Share
 
Weighted-
Average
Remaining
Contractual
Term (years)
 
Aggregate
Total Intrinsic
Value
 
 
 
 
 
 
 
 
LKE
 
 
 
 
 
 
 
Outstanding at beginning of period
61,896

 
$
25.81

 
 
 
 
Exercised
(28,164
)
 
26.59

 
 
 
 
Outstanding and exercisable at end of period
33,732

 
25.15

 
4.1
 
$
—
Compensation Costs for Restricted Stock, Restricted Stock Units, Performance Units and Stock Options
Compensation expense for restricted stock, restricted stock units, performance units and stock options accounted for as equity awards, which for PPL Electric and LKE includes an allocation of PPL Services' expense, was:
 
2017
 
2016
 
2015
PPL
$
32

 
$
27

 
$
33

PPL Electric
18

 
16

 
14

LKE
8

 
7

 
8


The income tax benefit related to above compensation expense was as follows:
 
2017
 
2016
 
2015
PPL
$
13

 
$
12

 
$
14

PPL Electric
8

 
7

 
6

LKE
3

 
3

 
3
Unrecognized Compensation Cost, Nonvested Restricted Stock, Restricted Stock Units, Performance Units and Stock Option Awards
At December 31, 2017, unrecognized compensation expense related to nonvested stock awards was:
 
Unrecognized
Compensation
Expense
 
Weighted-
Average
Period for
Recognition
PPL
$
10

 
1.7
PPL Electric
2

 
1.7
LKE
1

 
1.6