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Stock-Based Compensation (Tables) | 12 Months Ended
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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

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