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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
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:
| 2018 |  | 2017 |  | 2016
PPL | $ | 30.58 |  |  | $ | 35.30 |  |  | $ | 33.84 |
PPL Electric | 30.00 |  |  | 35.45 |  |  | 34.32 |
LKE | 30.98 |  |  | 35.25 |  |  | 33.73 |
Restricted Stock and Restricted Stock Units, Activity Rollforward | Restricted stock unit activity for 2018 was:
| Restricted Shares/Units |  | Weighted- Average Grant Date Fair Value Per Share
PPL |  |  |
Nonvested, beginning of period | 1,291,649 |  |  | $ | 34.07 |
Granted | 369,308 |  |  | 30.58 |
Vested | (529,263 | ) |  | 32.97 |
Forfeited | (33,491 | ) |  | 33.30 |
Nonvested, end of period (a) | 1,098,203 |  |  | 33.45 |
PPL Electric |  |  |
Nonvested, beginning of period | 184,416 |  |  | $ | 34.20 |
Transfer between registrants | (2,906 | ) |  | 33.95 |
Granted | 76,051 |  |  | 30.00 |
Vested | (56,352 | ) |  | 32.39 |
Forfeited | (13,872 | ) |  | 33.50 |
Nonvested, end of period | 187,337 |  |  | 33.09 |
LKE |  |  |
Nonvested, beginning of period | 231,557 |  |  | $ | 34.01 |
Transfer between registrants | (1,284 | ) |  | 33.98 |
Granted | 58,377 |  |  | 30.98 |
Vested | (154,606 | ) |  | 33.38 |
Forfeited | (1,014 | ) |  | 29.52 |
Nonvested, end of period | 133,030 |  |  | 33.45 |
(a) | Excludes 45,298 restricted stock units for which restrictions lapsed for former PPL Energy Supply employees as a result of the June 2015 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:
| 2018 |  | 2017 |  | 2016
PPL | $ | 16 |  |  | $ | 20 |  |  | $ | 30 |
PPL Electric | 2 |  |  | 3 |  |  | 3 |
LKE | 5 |  |  | 4 |  |  | 5 |
Performance Units, Valuation Assumptions | The weighted-average assumptions used in the model were:
| 2018 |  | 2017 |  | 2016
Expected stock volatility | 17.60 | % |  | 17.40 | % |  | 19.60 | %
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:
| 2018 |  | 2017 |  | 2016
PPL | $ | 38.26 |  |  | $ | 38.38 |  |  | $ | 35.74 |
PPL Electric | 38.37 |  |  | 38.37 |  |  | 35.68 |
LKE | 38.32 |  |  | 38.24 |  |  | 35.28 |
The weighted-average grant date fair value of ROE performance units granted was:
| 2018 |  | 2017
PPL | $ | 32.21 |  |  | $ | 32.42 |
PPL Electric | 32.32 |  |  | 34.41 |
LKE | 32.28 |  |  | 34.29 |
Performance Units, Activity Rollforward | TSR performance unit activity for 2018 was:
| TSR Performance Units |  | Weighted- Average Grant Date Fair Value Per Share
PPL |  |  |
Nonvested, beginning of period | 978,231 |  |  | $ | 36.67 |
Granted | 263,593 |  |  | 38.26 |
| TSR Performance Units |  | Weighted- Average Grant Date Fair Value Per Share
Vested | (89,015 | ) |  | 34.78 |
Forfeited (a) | (312,685 | ) |  | 35.26 |
Nonvested, end of period | 840,124 |  |  | 37.89 |
PPL Electric |  |  |
Nonvested, beginning of period | 75,513 |  |  | $ | 37.00 |
Granted | 22,394 |  |  | 38.37 |
Vested | (5,817 | ) |  | 35.34 |
Forfeited (a) | (24,227 | ) |  | 36.27 |
Nonvested, end of period | 67,863 |  |  | 37.86 |
LKE |  |  |
Nonvested, beginning of period | 180,289 |  |  | $ | 36.69 |
Granted | 53,961 |  |  | 38.32 |
Vested | (14,547 | ) |  | 35.04 |
Forfeited (a) | (70,707 | ) |  | 35.91 |
Nonvested, end of period | 148,996 |  |  | 37.81 |
(a) | Primarily related to the forfeiture of 2015 performance units as performance during the period was below the minimum established performance threshold, which resulted in no payout.
ROE performance unit activity for 2018 was:
| ROE Performance Unit |  | Weighted- Average Grant Date Fair Value Per Share
PPL |  |  |
Nonvested, beginning of period | 96,928 |  |  | $ | 34.42 |
Granted | 234,664 |  |  | 32.21 |
Forfeited | (2,634 | ) |  | 32.96 |
Nonvested, end of period | 328,958 |  |  | 32.86 |
PPL Electric |  |  |
Nonvested, beginning of period | 8,696 |  |  | $ | 34.41 |
Granted | 19,899 |  |  | 32.32 |
Forfeited | (2,635 | ) |  | 32.96 |
Nonvested, end of period | 25,960 |  |  | 32.96 |
LKE |  |  |
Nonvested, beginning of period | 20,539 |  |  | $ | 34.29 |
Granted | 49,081 |  |  | 32.28 |
Nonvested, end of period | 69,620 |  |  | 32.87 |
The weighted-average grant date fair value of TSR performance units granted was:
| 2018 |  | 2017 |  | 2016
PPL | $ | 38.26 |  |  | $ | 38.38 |  |  | $ | 35.74 |
PPL Electric | 38.37 |  |  | 38.37 |  |  | 35.68 |
LKE | 38.32 |  |  | 38.24 |  |  | 35.28 |
The weighted-average grant date fair value of ROE performance units granted was:
| 2018 |  | 2017
PPL | $ | 32.21 |  |  | $ | 32.42 |
PPL Electric | 32.32 |  |  | 34.41 |
LKE | 32.28 |  |  | 34.29 |
Stock Options, Activity Rollforward | Stock option activity for 2018 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 | 3,762,183 |  |  | $ | 29.42 |  |  |  |  |
Exercised | (151,750 | ) |  | 28.43 |  |  |  |  |
Forfeited | (695,908 | ) |  | 42.87 |  |  |  |  |
Outstanding and exercisable at end of period | 2,914,525 |  |  | 26.26 |  |  | 3.4 |  | $ | 6 |
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:
| 2018 |  | 2017 |  | 2016
PPL | $ | 25 |  |  | $ | 32 |  |  | $ | 27 |
PPL Electric | 10 |  |  | 18 |  |  | 16 |
LKE | 8 |  |  | 8 |  |  | 7 |
The income tax benefit related to above compensation expense was as follows:
| 2018 |  | 2017 |  | 2016
PPL | $ | 10 |  |  | $ | 13 |  |  | $ | 12 |
PPL Electric | 3 |  |  | 8 |  |  | 7 |
LKE | 2 |  |  | 3 |  |  | 3 |
Unrecognized Compensation Cost, Nonvested Restricted Stock, Restricted Stock Units, Performance Units and Stock Option Awards | At December 31, 2018, unrecognized compensation expense related to nonvested stock awards was:
| Unrecognized Compensation Expense |  | Weighted- Average Period for Recognition
PPL | $ | 10 |  |  | 1.6
PPL Electric | 2 |  |  | 1.7
LKE | 1 |  |  | 1.4
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:
| 2018 |  | 2017 |  | 2016
PPL | $ | 30.58 |  |  | $ | 35.30 |  |  | $ | 33.84 |
PPL Electric | 30.00 |  |  | 35.45 |  |  | 34.32 |
LKE | 30.98 |  |  | 35.25 |  |  | 33.73 |
Restricted Stock and Restricted Stock Units, Activity Rollforward | Restricted stock unit activity for 2018 was:
| Restricted Shares/Units |  | Weighted- Average Grant Date Fair Value Per Share
PPL |  |  |
Nonvested, beginning of period | 1,291,649 |  |  | $ | 34.07 |
Granted | 369,308 |  |  | 30.58 |
Vested | (529,263 | ) |  | 32.97 |
Forfeited | (33,491 | ) |  | 33.30 |
Nonvested, end of period (a) | 1,098,203 |  |  | 33.45 |
PPL Electric |  |  |
Nonvested, beginning of period | 184,416 |  |  | $ | 34.20 |
Transfer between registrants | (2,906 | ) |  | 33.95 |
Granted | 76,051 |  |  | 30.00 |
Vested | (56,352 | ) |  | 32.39 |
Forfeited | (13,872 | ) |  | 33.50 |
Nonvested, end of period | 187,337 |  |  | 33.09 |
LKE |  |  |
Nonvested, beginning of period | 231,557 |  |  | $ | 34.01 |
Transfer between registrants | (1,284 | ) |  | 33.98 |
Granted | 58,377 |  |  | 30.98 |
Vested | (154,606 | ) |  | 33.38 |
Forfeited | (1,014 | ) |  | 29.52 |
Nonvested, end of period | 133,030 |  |  | 33.45 |
(a) | Excludes 45,298 restricted stock units for which restrictions lapsed for former PPL Energy Supply employees as a result of the June 2015 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:
| 2018 |  | 2017 |  | 2016
PPL | $ | 16 |  |  | $ | 20 |  |  | $ | 30 |
PPL Electric | 2 |  |  | 3 |  |  | 3 |
LKE | 5 |  |  | 4 |  |  | 5 |
Performance Units, Valuation Assumptions | The weighted-average assumptions used in the model were:
| 2018 |  | 2017 |  | 2016
Expected stock volatility | 17.60 | % |  | 17.40 | % |  | 19.60 | %
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:
| 2018 |  | 2017 |  | 2016
PPL | $ | 38.26 |  |  | $ | 38.38 |  |  | $ | 35.74 |
PPL Electric | 38.37 |  |  | 38.37 |  |  | 35.68 |
LKE | 38.32 |  |  | 38.24 |  |  | 35.28 |
The weighted-average grant date fair value of ROE performance units granted was:
| 2018 |  | 2017
PPL | $ | 32.21 |  |  | $ | 32.42 |
PPL Electric | 32.32 |  |  | 34.41 |
LKE | 32.28 |  |  | 34.29 |
Performance Units, Activity Rollforward | TSR performance unit activity for 2018 was:
| TSR Performance Units |  | Weighted- Average Grant Date Fair Value Per Share
PPL |  |  |
Nonvested, beginning of period | 978,231 |  |  | $ | 36.67 |
Granted | 263,593 |  |  | 38.26 |
| TSR Performance Units |  | Weighted- Average Grant Date Fair Value Per Share
Vested | (89,015 | ) |  | 34.78 |
Forfeited (a) | (312,685 | ) |  | 35.26 |
Nonvested, end of period | 840,124 |  |  | 37.89 |
PPL Electric |  |  |
Nonvested, beginning of period | 75,513 |  |  | $ | 37.00 |
Granted | 22,394 |  |  | 38.37 |
Vested | (5,817 | ) |  | 35.34 |
Forfeited (a) | (24,227 | ) |  | 36.27 |
Nonvested, end of period | 67,863 |  |  | 37.86 |
LKE |  |  |
Nonvested, beginning of period | 180,289 |  |  | $ | 36.69 |
Granted | 53,961 |  |  | 38.32 |
Vested | (14,547 | ) |  | 35.04 |
Forfeited (a) | (70,707 | ) |  | 35.91 |
Nonvested, end of period | 148,996 |  |  | 37.81 |
(a) | Primarily related to the forfeiture of 2015 performance units as performance during the period was below the minimum established performance threshold, which resulted in no payout.
ROE performance unit activity for 2018 was:
| ROE Performance Unit |  | Weighted- Average Grant Date Fair Value Per Share
PPL |  |  |
Nonvested, beginning of period | 96,928 |  |  | $ | 34.42 |
Granted | 234,664 |  |  | 32.21 |
Forfeited | (2,634 | ) |  | 32.96 |
Nonvested, end of period | 328,958 |  |  | 32.86 |
PPL Electric |  |  |
Nonvested, beginning of period | 8,696 |  |  | $ | 34.41 |
Granted | 19,899 |  |  | 32.32 |
Forfeited | (2,635 | ) |  | 32.96 |
Nonvested, end of period | 25,960 |  |  | 32.96 |
LKE |  |  |
Nonvested, beginning of period | 20,539 |  |  | $ | 34.29 |
Granted | 49,081 |  |  | 32.28 |
Nonvested, end of period | 69,620 |  |  | 32.87 |
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:
| 2018 |  | 2017 |  | 2016
PPL | $ | 25 |  |  | $ | 32 |  |  | $ | 27 |
PPL Electric | 10 |  |  | 18 |  |  | 16 |
LKE | 8 |  |  | 8 |  |  | 7 |
The income tax benefit related to above compensation expense was as follows:
| 2018 |  | 2017 |  | 2016
PPL | $ | 10 |  |  | $ | 13 |  |  | $ | 12 |
PPL Electric | 3 |  |  | 8 |  |  | 7 |
LKE | 2 |  |  | 3 |  |  | 3 |
Unrecognized Compensation Cost, Nonvested Restricted Stock, Restricted Stock Units, Performance Units and Stock Option Awards | At December 31, 2018, unrecognized compensation expense related to nonvested stock awards was:
| Unrecognized Compensation Expense |  | Weighted- Average Period for Recognition
PPL | $ | 10 |  |  | 1.6
PPL Electric | 2 |  |  | 1.7
LKE | 1 |  |  | 1.4
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:
| 2018 |  | 2017 |  | 2016
PPL | $ | 30.58 |  |  | $ | 35.30 |  |  | $ | 33.84 |
PPL Electric | 30.00 |  |  | 35.45 |  |  | 34.32 |
LKE | 30.98 |  |  | 35.25 |  |  | 33.73 |
Restricted Stock and Restricted Stock Units, Activity Rollforward | Restricted stock unit activity for 2018 was:
| Restricted Shares/Units |  | Weighted- Average Grant Date Fair Value Per Share
PPL |  |  |
Nonvested, beginning of period | 1,291,649 |  |  | $ | 34.07 |
Granted | 369,308 |  |  | 30.58 |
Vested | (529,263 | ) |  | 32.97 |
Forfeited | (33,491 | ) |  | 33.30 |
Nonvested, end of period (a) | 1,098,203 |  |  | 33.45 |
PPL Electric |  |  |
Nonvested, beginning of period | 184,416 |  |  | $ | 34.20 |
Transfer between registrants | (2,906 | ) |  | 33.95 |
Granted | 76,051 |  |  | 30.00 |
Vested | (56,352 | ) |  | 32.39 |
Forfeited | (13,872 | ) |  | 33.50 |
Nonvested, end of period | 187,337 |  |  | 33.09 |
LKE |  |  |
Nonvested, beginning of period | 231,557 |  |  | $ | 34.01 |
Transfer between registrants | (1,284 | ) |  | 33.98 |
Granted | 58,377 |  |  | 30.98 |
Vested | (154,606 | ) |  | 33.38 |
Forfeited | (1,014 | ) |  | 29.52 |
Nonvested, end of period | 133,030 |  |  | 33.45 |
(a) | Excludes 45,298 restricted stock units for which restrictions lapsed for former PPL Energy Supply employees as a result of the June 2015 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:
| 2018 |  | 2017 |  | 2016
PPL | $ | 16 |  |  | $ | 20 |  |  | $ | 30 |
PPL Electric | 2 |  |  | 3 |  |  | 3 |
LKE | 5 |  |  | 4 |  |  | 5 |
Performance Units, Valuation Assumptions | The weighted-average assumptions used in the model were:
| 2018 |  | 2017 |  | 2016
Expected stock volatility | 17.60 | % |  | 17.40 | % |  | 19.60 | %
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:
| 2018 |  | 2017 |  | 2016
PPL | $ | 38.26 |  |  | $ | 38.38 |  |  | $ | 35.74 |
PPL Electric | 38.37 |  |  | 38.37 |  |  | 35.68 |
LKE | 38.32 |  |  | 38.24 |  |  | 35.28 |
The weighted-average grant date fair value of ROE performance units granted was:
| 2018 |  | 2017
PPL | $ | 32.21 |  |  | $ | 32.42 |
PPL Electric | 32.32 |  |  | 34.41 |
LKE | 32.28 |  |  | 34.29 |
Performance Units, Activity Rollforward | TSR performance unit activity for 2018 was:
| TSR Performance Units |  | Weighted- Average Grant Date Fair Value Per Share
PPL |  |  |
Nonvested, beginning of period | 978,231 |  |  | $ | 36.67 |
Granted | 263,593 |  |  | 38.26 |
| TSR Performance Units |  | Weighted- Average Grant Date Fair Value Per Share
Vested | (89,015 | ) |  | 34.78 |
Forfeited (a) | (312,685 | ) |  | 35.26 |
Nonvested, end of period | 840,124 |  |  | 37.89 |
PPL Electric |  |  |
Nonvested, beginning of period | 75,513 |  |  | $ | 37.00 |
Granted | 22,394 |  |  | 38.37 |
Vested | (5,817 | ) |  | 35.34 |
Forfeited (a) | (24,227 | ) |  | 36.27 |
Nonvested, end of period | 67,863 |  |  | 37.86 |
LKE |  |  |
Nonvested, beginning of period | 180,289 |  |  | $ | 36.69 |
Granted | 53,961 |  |  | 38.32 |
Vested | (14,547 | ) |  | 35.04 |
Forfeited (a) | (70,707 | ) |  | 35.91 |
Nonvested, end of period | 148,996 |  |  | 37.81 |
(a) | Primarily related to the forfeiture of 2015 performance units as performance during the period was below the minimum established performance threshold, which resulted in no payout.
ROE performance unit activity for 2018 was:
| ROE Performance Unit |  | Weighted- Average Grant Date Fair Value Per Share
PPL |  |  |
Nonvested, beginning of period | 96,928 |  |  | $ | 34.42 |
Granted | 234,664 |  |  | 32.21 |
Forfeited | (2,634 | ) |  | 32.96 |
Nonvested, end of period | 328,958 |  |  | 32.86 |
PPL Electric |  |  |
Nonvested, beginning of period | 8,696 |  |  | $ | 34.41 |
Granted | 19,899 |  |  | 32.32 |
Forfeited | (2,635 | ) |  | 32.96 |
Nonvested, end of period | 25,960 |  |  | 32.96 |
LKE |  |  |
Nonvested, beginning of period | 20,539 |  |  | $ | 34.29 |
Granted | 49,081 |  |  | 32.28 |
Nonvested, end of period | 69,620 |  |  | 32.87 |
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:
| 2018 |  | 2017 |  | 2016
PPL | $ | 25 |  |  | $ | 32 |  |  | $ | 27 |
PPL Electric | 10 |  |  | 18 |  |  | 16 |
LKE | 8 |  |  | 8 |  |  | 7 |
The income tax benefit related to above compensation expense was as follows:
| 2018 |  | 2017 |  | 2016
PPL | $ | 10 |  |  | $ | 13 |  |  | $ | 12 |
PPL Electric | 3 |  |  | 8 |  |  | 7 |
LKE | 2 |  |  | 3 |  |  | 3 |
Unrecognized Compensation Cost, Nonvested Restricted Stock, Restricted Stock Units, Performance Units and Stock Option Awards | At December 31, 2018, unrecognized compensation expense related to nonvested stock awards was:
| Unrecognized Compensation Expense |  | Weighted- Average Period for Recognition
PPL | $ | 10 |  |  | 1.6
PPL Electric | 2 |  |  | 1.7
LKE | 1 |  |  | 1.4

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