Stock-Based Compensation (Tables)

12 Months Ended

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