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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock options - additional disclosures (Details) [Abstract]      
Period after which employee stock options become exercisable in installments (in years) 3    
Incentive Compensation Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares approved for awards under the plan (in shares) 15,769,431    
Number of shares available for awards in any calendar year as a percentage of the outstanding common stock of PPL under the plan 2.00%    
The maximum number of options that can be awarded under the plan to any single eligible employee in any calendar year (in shares) 3,000,000    
Incentive Compensation Plan For Key Employees [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares approved for awards under the plan (in shares) 14,199,796    
Number of shares available for awards in any calendar year as a percentage of the outstanding common stock of PPL under the plan 2.00%    
The maximum number of options that can be awarded under the plan to any single eligible employee in any calendar year (in shares) 3,000,000    
Incentive Compensation Plan And Incentive Compensation Plan For Key Employees [Member] | Restricted Shares And Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Nonvested, beginning of period (in shares) 1,663,122    
Granted (in shares) 895,980    
Vested (in shares) (495,917)    
Forfeited (in shares) (23,150)    
Nonvested, end of period (in shares) 2,040,035 1,663,122  
Awards, other than equity based, additional disclosures (Details) [Abstract]      
Weighted-average grant date fair value per share, nonvested, beginning of period (in dollars per share) $ 31.22    
Weighted-average grant date fair value per share, granted (in dollars per share) $ 25.25 $ 28.93 $ 29.07
Weighted-average grant date fair value per share, vested (in dollars per share) $ 37.81    
Weighted-average grant date fair value per share, forfeited (in dollars per share) $ 28.56    
Weighted-average grant date fair value per share, nonvested - end of period (in dollars per share) $ 27.03 $ 31.22  
Total fair value of units vested during the period $ 19 $ 15 $ 22
Fair value assumptions and methodology [Abstract]      
Award vesting period (in years) 3    
Incentive Compensation Plan And Incentive Compensation Plan For Key Employees [Member] | Performance Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Nonvested, beginning of period (in shares) 286,040    
Granted (in shares) 182,953    
Forfeited (in shares) (70,384)    
Nonvested, end of period (in shares) 398,609 286,040  
Awards, other than equity based, additional disclosures (Details) [Abstract]      
Weighted-average grant date fair value per share, nonvested, beginning of period (in dollars per share) $ 39.40    
Weighted-average grant date fair value per share, granted (in dollars per share) $ 29.67 $ 34.06 $ 39.76
Weighted-average grant date fair value per share, forfeited (in dollars per share) $ 48.61    
Weighted-average grant date fair value per share, nonvested - end of period (in dollars per share) $ 33.31 $ 39.40  
Period over which performance units fair value is recognized (in years) 3    
Award payout percentage of target award if PPL's performance is at or above the 85th percentile of the S&P Electric Utilities Index 200.00%    
Award payout percentage of target award if PPL's performance is at or above the 50th percentile of the S&P Electric Utilities Index 100.00%    
Award payout percentage of target award if PPL's performance is at or above 40th percentile of the S&P Electric Utilities Index 50.00%    
Award payout percentage of target award if PPL's performance is below the 40th percentile of the S&P Electric Utilities Index 25.00%    
Fair value assumptions and methodology [Abstract]      
Risk free interest rate 1.00% 1.41% 1.11%
Expected stock volatility 23.40% 34.70% 31.30%
Expected life (in years) 3 3 3
Stock options - additional disclosures (Details) [Abstract]      
Period that performance goals are evaluated (in years) 3    
Incentive Compensation Plan And Incentive Compensation Plan For Key Employees [Member] | Stock Options [Member]
     
Aggregate disclosures [Abstract]      
Cash received from exercise of stock options 1 2  
Fair value assumptions and methodology [Abstract]      
Risk free interest rate 2.34% 2.52% 2.07%
Expected stock volatility 21.60% 28.57% 26.06%
Expected life (in years) 5.71 5.43 5.25
Dividend yield 5.93% 5.61% 3.48%
Stock option activity [Roll Forward]      
Outstanding at beginning of period (in shares) 5,603,981    
Granted (in shares) 2,068,080    
Exercised (in shares) (69,220)    
Forfeited (in shares) (72,643)    
Outstanding at end of period (in shares) 7,530,198 5,603,981  
Stock options - additional disclosures (Details) [Abstract]      
Period after the date of grant that employee must be employed before stock option exercise date can be accelerated (in years) 1    
Period after which, employee stock options expire (in years) 10    
Weighted-average exercise price per share at beginning of period (in dollars per share) $ 32.31    
Weighted average exercise price per share, granted (in dollars per share) $ 25.78    
Weighted average exercise price per share, exercised (in dollars per share) $ 21.00    
Weighted average exercise price per share, forfeited (in dollars per share) $ 29.16    
Weighted average exercise price per share at end of period (in dollars per share) $ 30.65 $ 32.31  
Weighted average remaining contractual term (in years) 6.5    
Aggregate total intrinsic value 12    
Options exercisable at end of period (in shares) 4,493,789    
Weighted average exercise price, options exercisable at end of period (in dollars per share) $ 32.74    
Weighted average remaining contractual term, options exercisable at end of period (in years) 5.0    
Aggregate total intrinsic value, options exercisable at end of period 5    
Weighted average grant date fair value of options granted (in dollars per share) $ 2.47 $ 4.70 $ 5.55
Incentive Compensation Plan And Incentive Compensation Plan For Key Employees [Member] | All Awards [Member]
     
Aggregate disclosures [Abstract]      
Unrecognized compensation expense 19    
Weighted-average period for recognition 1.7    
Compensation expense 36 [1] 26 [1] 23 [1]
Income tax benefit $ 15 $ 11 $ 9
[1] Income tax benefits of $15 million, $11 million and $9 million.