Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Stock-Based Compensation [Abstract]

Restricted Stock and Restricted Stock Units, Weighted Average Grant Date Fair Value

The weighted-average grant date fair value of restricted stock and restricted stock units granted was:

	2011		2010		2009
PPL	$	25.25	$	28.93	$	29.07
PPL Energy Supply		25.14		29.49		28.49
PPL Electric		25.09		29.40		29.49
LKE				26.31

Restricted Stock and Restricted Stock Units, Activity Rollforward

Restricted stock and restricted stock unit activity for 2011 was:

			Weighted-
			Average
		Restricted	Grant Date Fair
		Shares/Units	Value Per Share
PPL
Nonvested, beginning of period		1,663,122	$	31.22
	Granted	895,980		25.25
	Vested	(495,917)		37.81
	Forfeited	(23,150)		28.56
Nonvested, end of period		2,040,035		27.03
PPL Energy Supply
Nonvested, beginning of period		580,417	$	31.33
	Transferred	(86,690)		22.89
	Granted	326,120		25.14
	Vested	(136,767)		41.11
	Forfeited	(17,900)		28.51
Nonvested, end of period		665,180		27.30
PPL Electric
Nonvested, beginning of period		169,325	$	31.20
	Transferred	13,160		32.92
	Granted	126,100		25.09
	Vested	(51,740)		36.94
	Forfeited	(5,250)		28.76
Nonvested, end of period		251,595		27.10
LKE
Nonvested, beginning of period		174,170	$	26.31
	Vested	(28,960)		26.31
Nonvested, end of period		145,210		26.31

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:

	2011		2010		2009
PPL	$	19	$	15	$	22
PPL Energy Supply		6		7		12
PPL Electric		2		2		2
LKE		1

Performance Units, Valuation Assumptions

The weighted-average assumptions used in the model were:

	2011	2010	2009
Risk-free interest rate	1.00%	1.41%	1.11%
Expected stock volatility	23.40%	34.70%	31.30%
Expected life	3 years	3 years	3 years

Performance Units, Weighted Average Grant Date Fair Value

The weighted-average grant date fair value of performance units granted was:

	2011		2010		2009
PPL	$	29.67	$	34.06	$	39.76
PPL Energy Supply		29.68		34.16		38.18
PPL Electric		29.57		33.54		39.95
LKE		29.20

Performance Units, Activity Rollforward

Performance unit activity for 2011 was:

				Weighted-
				Average Grant
		Performance		Date Fair Value
		Units		Per Share
PPL
Nonvested, beginning of period			286,040	$	39.40
	Granted		182,953		29.67
	Forfeited		(70,384)		48.61
Nonvested, end of period			398,609		33.31
PPL Energy Supply
Nonvested, beginning of period			77,864	$	39.08
	Transferred		(18,081)		40.37
	Granted		32,034		29.68
	Forfeited		(16,750)		46.95
Nonvested, end of period			75,067		33.00
PPL Electric
Nonvested, beginning of period			22,231	$	38.34
	Granted		14,730		29.57
	Forfeited		(4,153)		48.57
Nonvested, end of period			32,808		33.11
LKE
Nonvested, beginning of period
	Granted		26,893	$	29.20
Nonvested, end of period			26,893		29.20

Stock Options, Valuation Assumptions

The assumptions used in the model were:

	2011		2010		2009
Risk-free interest rate		2.34%		2.52%		2.07%
Expected option life		5.71 years		5.43 years		5.25 years
Expected stock volatility		21.60%		28.57%		26.06%
Dividend yield		5.93%		5.61%		3.48%

Stock Options, Weighted Average Grant Date Fair Value

The weighted-average grant date fair value of options granted was:

	2011		2010		2009
PPL	$	2.47	$	4.70	$	5.55
PPL Energy Supply		2.47		4.73		5.55
PPL Electric		2.47		4.62		5.65
LKE		2.47

Stock Options, Activity Rollforward

Stock option activity for 2011 was:

						Weighted-
				Weighted		Average
				Average		Remaining		Aggregate
		Number		Exercise		Contractual		Total Intrinsic
		of Options		Price Per Share		Term		Value
PPL
Outstanding at beginning of period			5,603,981	$	32.31
	Granted		2,068,080		25.78
	Exercised		(69,220)		21.00
	Forfeited		(72,643)		29.16
Outstanding at end of period			7,530,198		30.65		6.5	$	12
Options exercisable at end of period			4,493,789		32.74		5.0		5
PPL Energy Supply
Outstanding at beginning of period			1,661,026	$	31.92
	Transferred		(296,705)		31.86
	Granted		383,990		25.80
	Exercised		(31,280)		21.58
	Forfeited		(26,878)		28.25
Outstanding at end of period			1,690,153		30.79		6.1	$	2
Options exercisable at end of period			1,115,175		32.34		4.8		1
PPL Electric
Outstanding at beginning of period			317,150	$	33.53
	Granted		168,120		25.74
	Forfeited		(24,760)		26.66
Outstanding at end of period			460,510		31.05		7.5	$	1
Options exercisable at end of period			207,612		35.36		6.1
LKE
Outstanding at beginning of period
	Granted		329,600	$	25.77
Outstanding at end of period			329,600		25.77		9.1	$	1

Compensation Costs for Restricted Stock, Restricted Stock Units, Performance Units and Stock Options

Compensation Expense

Compensation expense for restricted stock, restricted stock units, performance units and stock options accounted for as equity awards was as follows:

	2011		2010		2009
PPL (a)	$	36	$	26	$	23
PPL Energy Supply (b)		16		20		17
PPL Electric (c)		8		6		5
LKE (d)		5

(a)       Income tax benefits of $15 million, $11 million and $9 million.

Unrecognized Compensation Cost, Nonvested Restricted Stock, Restricted Stock Units, Performance Units and Stock Option Awards

At December 31, 2011, unrecognized compensation expense related to nonvested restricted stock, restricted stock units, performance units and stock option awards was:

			Weighted-
	Unrecognized		Average
	Compensation		Period for
	Expense		Recognition
PPL	$	19		1.7 years
PPL Energy Supply		6		1.7 years
PPL Electric		3		2.3 years
LKE		2		1.2 years