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Summary of Significant Accounting Policies (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
$ / shares
May 31, 2016
Foreign Currency Translation and Transactions (Numeric) [Abstract]            
Foreign currency exchange translation rate from GBP to USD   1.34   1.34   1.46
Discount Rate Change for U.K. Pension Plans (Numeric) [Abstract]            
Decrease in net periodic defined benefit cost from change in the discount rate   $ 11   $ 22    
Decrease in net periodic defined benefit cost from change in the discount rate, after-tax   $ 9   $ 18    
Decrease in net periodic defined benefit cost from change in the discount rate, per share | $ / shares   $ 0.02   $ 0.03    
Accounting for Stock-Based Compensation (Numeric) [Abstract]            
Income tax benefit   $ (192) $ (71) $ (371) $ (288)  
Per share | $ / shares   $ 0.71 $ (1.13) $ 1.42 $ (0.17)  
Cumulative effect adjustment to earnings reinvested       $ 7    
New Accounting Pronouncement Early Adoption [Member]            
Accounting for Stock-Based Compensation (Numeric) [Abstract]            
Income tax benefit   $ 3   $ 11    
Per share | $ / shares       $ 0.02    
Cumulative effect adjustment to earnings reinvested       $ 7    
Unaffiliated Third Party Entity [Member]            
Accounts Receivable (Numeric) [Abstract]            
Purchases of accounts receivable   297 $ 276 679 $ 607  
Subsequent Event [Member]            
Foreign Currency Translation and Transactions (Numeric) [Abstract]            
Foreign currency translation loss recorded in accumulated other comprehensive income $ 499          
Decrease in property, plant and equipment from fluctuation in foreign currency translation rate (991)          
Decrease in goodwill from fluctuation in foreign currency translation rate (228)          
Decrease in long-term debt from fluctuation in foreign currency translation rate $ (606)          
PPL Electric Utilities Corp [Member]            
Accounting for Stock-Based Compensation (Numeric) [Abstract]            
Income tax benefit   (48) (36) (104) (95)  
PPL Electric Utilities Corp [Member] | New Accounting Pronouncement Early Adoption [Member]            
Accounting for Stock-Based Compensation (Numeric) [Abstract]            
Income tax benefit   2   7    
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]            
Accounts Receivable (Numeric) [Abstract]            
Purchases of accounts receivable   $ 297 276 $ 679 607  
PPL Electric Utilities Corp [Member] | PPL EnergyPlus [Member]            
Accounts Receivable (Numeric) [Abstract]            
Purchases of accounts receivable     $ 53   $ 146