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Revenue from Contracts with Customers (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Days
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Revenue from contracts with customers [Line Items]                      
Operating Revenues $ 1,939 $ 1,872 $ 1,848 $ 2,126 $ 1,926 $ 1,845 $ 1,725 $ 1,951 $ 7,785 $ 7,447 $ 7,517
Reconciliation of Revenue from Contracts with Customers [Abstract]                      
Alternative Revenue Programs                 32    
Other Revenue                 (38)    
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 7,779    
Credit loss from contract with customer [Abstract]                      
Provision for Doubtful Accounts                 34    
Contract with Customer, Asset and Liability [Abstract]                      
Contract with Customer, Liability 42       29       42 29  
Contract with Customer, Liability, Revenue Recognized                 21    
Licensed energy supplier [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 2,127    
Residential [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 2,704    
Commercial [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 1,233    
Industrial [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 624    
Other [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 489    
Wholesale Municipal [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 118    
Wholesale Other [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 79    
Transmission [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 405    
Pennsylvania Regulated [Member]                      
Revenue from contracts with customers [Line Items]                      
Operating Revenues                 $ 2,277 2,195 2,156
Number Of Days Due From Invoice Date | Days                 21    
U.K. Regulated [Member]                      
Revenue from contracts with customers [Line Items]                      
Operating Revenues                 $ 2,268 2,091 2,207
Number Of Days Due From Invoice Date | Days                 14    
Kentucky Regulated [Member]                      
Revenue from contracts with customers [Line Items]                      
Operating Revenues                 $ 3,214 3,156 3,141
Number Of Days Due From Invoice Date | Days                 22    
Corporate Segment [Member]                      
Revenue from contracts with customers [Line Items]                      
Operating Revenues                 $ 26 5 13
Contract with Customer, Asset and Liability [Abstract]                      
Contract with Customer, Liability, Revenue Recognized                 $ 37    
PPL Electric [Member]                      
Revenue from contracts with customers [Line Items]                      
Number Of Days Due From Invoice Date | Days                 21    
LGE [Member]                      
Revenue from contracts with customers [Line Items]                      
Number Of Days Due From Invoice Date | Days                 22    
KU [Member]                      
Revenue from contracts with customers [Line Items]                      
Number Of Days Due From Invoice Date | Days                 22    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | Corporate Segment [Member]                      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]                      
Revenue, Remaining Performance Obligation, Amount $ 49               $ 49    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 12 months               12 months    
PPL Electric Utilities Corp [Member]                      
Revenue from contracts with customers [Line Items]                      
Operating Revenues $ 573 $ 548 $ 517 $ 639 575 $ 547 $ 500 $ 573 $ 2,277 2,195 2,156
Number Of Days Due From Invoice Date | Days                 21    
Reconciliation of Revenue from Contracts with Customers [Abstract]                      
Alternative Revenue Programs                 $ (6)    
Other Revenue                 (12)    
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 2,259    
Credit loss from contract with customer [Abstract]                      
Provision for Doubtful Accounts                 24    
Contract with Customer, Asset and Liability [Abstract]                      
Contract with Customer, Liability 23       19       23 19  
Contract with Customer, Liability, Revenue Recognized                 8    
PPL Electric Utilities Corp [Member] | Licensed energy supplier [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 0    
PPL Electric Utilities Corp [Member] | Residential [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 1,379    
PPL Electric Utilities Corp [Member] | Commercial [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 368    
PPL Electric Utilities Corp [Member] | Industrial [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 54    
PPL Electric Utilities Corp [Member] | Other [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 53    
PPL Electric Utilities Corp [Member] | Wholesale Municipal [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 0    
PPL Electric Utilities Corp [Member] | Wholesale Other [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 0    
PPL Electric Utilities Corp [Member] | Distribution [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 1,900    
PPL Electric Utilities Corp [Member] | Transmission [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 405    
LG And E And KU Energy LLC [Member]                      
Revenue from contracts with customers [Line Items]                      
Operating Revenues                 3,214 3,156 3,141
Reconciliation of Revenue from Contracts with Customers [Abstract]                      
Alternative Revenue Programs                 38    
Other Revenue                 (17)    
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 3,235    
Credit loss from contract with customer [Abstract]                      
Provision for Doubtful Accounts                 9    
Contract with Customer, Asset and Liability [Abstract]                      
Contract with Customer, Liability 9       8       9 8  
Contract with Customer, Liability, Revenue Recognized                 8    
LG And E And KU Energy LLC [Member] | Licensed energy supplier [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 0    
LG And E And KU Energy LLC [Member] | Residential [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 1,325    
LG And E And KU Energy LLC [Member] | Commercial [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 865    
LG And E And KU Energy LLC [Member] | Industrial [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 570    
LG And E And KU Energy LLC [Member] | Other [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 278    
LG And E And KU Energy LLC [Member] | Wholesale Municipal [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 118    
LG And E And KU Energy LLC [Member] | Wholesale Other [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 79    
LG And E And KU Energy LLC [Member] | Transmission [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 $ 0    
LG And E And KU Energy LLC [Member] | LGE [Member]                      
Revenue from contracts with customers [Line Items]                      
Number Of Days Due From Invoice Date | Days                 22    
LG And E And KU Energy LLC [Member] | KU [Member]                      
Revenue from contracts with customers [Line Items]                      
Number Of Days Due From Invoice Date | Days                 22    
Louisville Gas And Electric Co [Member]                      
Revenue from contracts with customers [Line Items]                      
Operating Revenues                 $ 1,496 1,453 1,430
Number Of Days Due From Invoice Date | Days                 22    
Reconciliation of Revenue from Contracts with Customers [Abstract]                      
Alternative Revenue Programs                 $ 12    
Other Revenue                 (5)    
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 1,503    
Credit loss from contract with customer [Abstract]                      
Provision for Doubtful Accounts                 4    
Contract with Customer, Asset and Liability [Abstract]                      
Contract with Customer, Liability 5       4       5 4  
Contract with Customer, Liability, Revenue Recognized                 4    
Louisville Gas And Electric Co [Member] | Licensed energy supplier [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 0    
Louisville Gas And Electric Co [Member] | Residential [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 666    
Louisville Gas And Electric Co [Member] | Commercial [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 455    
Louisville Gas And Electric Co [Member] | Industrial [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 180    
Louisville Gas And Electric Co [Member] | Other [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 129    
Louisville Gas And Electric Co [Member] | Wholesale Municipal [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 0    
Louisville Gas And Electric Co [Member] | Wholesale Other [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 73    
Louisville Gas And Electric Co [Member] | Transmission [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 0    
Kentucky Utilities Co [Member]                      
Revenue from contracts with customers [Line Items]                      
Operating Revenues                 $ 1,760 1,744 $ 1,749
Number Of Days Due From Invoice Date | Days                 22    
Reconciliation of Revenue from Contracts with Customers [Abstract]                      
Alternative Revenue Programs                 $ 26    
Other Revenue                 (12)    
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 1,774    
Credit loss from contract with customer [Abstract]                      
Provision for Doubtful Accounts                 5    
Contract with Customer, Asset and Liability [Abstract]                      
Contract with Customer, Liability $ 4       $ 4       4 $ 4  
Contract with Customer, Liability, Revenue Recognized                 4    
Kentucky Utilities Co [Member] | Licensed energy supplier [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 0    
Kentucky Utilities Co [Member] | Residential [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 659    
Kentucky Utilities Co [Member] | Commercial [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 410    
Kentucky Utilities Co [Member] | Industrial [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 390    
Kentucky Utilities Co [Member] | Other [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 149    
Kentucky Utilities Co [Member] | Wholesale Municipal [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 118    
Kentucky Utilities Co [Member] | Wholesale Other [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 48    
Kentucky Utilities Co [Member] | Transmission [Member]                      
Disaggregation of Revenue [Abstract]                      
Revenue from Contracts with Customers                 $ 0