XML 71 R44.htm IDEA: XBRL DOCUMENT v3.4.0.3
Summary of Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Discount Rate Change for U.K. Pension Plans (Numeric) [Abstract]    
Decrease in net periodic defined benefit cost from change in the discount rate $ 11  
Decrease in net periodic defined benefit cost from change in the discount rate, after-tax $ 9  
Decrease in net periodic defined benefit cost from change in the discount rate, per share $ 0.01  
Accounting for Stock-Based Compensation (Numeric) [Abstract]    
Income tax benefit $ (179) $ (217)
Per share $ 0.71 $ 0.97
Cumulative effect adjustment to earnings reinvested $ 7  
New Accounting Pronouncement Early Adoption [Member]    
Accounting for Stock-Based Compensation (Numeric) [Abstract]    
Income tax benefit $ 8  
Per share $ 0.01  
Cumulative effect adjustment to earnings reinvested $ 7  
Unaffiliated Third Party Entity [Member]    
Accounts Receivable (Numeric) [Abstract]    
Purchases of accounts receivable 382 $ 331
PPL Electric Utilities Corp [Member]    
Accounting for Stock-Based Compensation (Numeric) [Abstract]    
Income tax benefit (56) (59)
PPL Electric Utilities Corp [Member] | New Accounting Pronouncement Early Adoption [Member]    
Accounting for Stock-Based Compensation (Numeric) [Abstract]    
Income tax benefit 5  
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]    
Accounts Receivable (Numeric) [Abstract]    
Purchases of accounts receivable $ 382 331
PPL Electric Utilities Corp [Member] | PPL EnergyPlus [Member]    
Accounts Receivable (Numeric) [Abstract]    
Purchases of accounts receivable   $ 93