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Revenue from Contracts with Customers (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Days
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2020
USD ($)
Revenue from contracts with customers [Line Items]                        
Operating Revenues $ 1,954 $ 1,933 $ 1,803 $ 2,079 $ 1,939 $ 1,872 $ 1,848 $ 2,126 $ 7,769 $ 7,785 $ 7,447  
Reconciliation of Revenue from Contracts with Customers [Abstract]                        
Alternative Revenue Programs                 (30) 32    
Other Revenue                 (38) (38)    
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 7,701 7,779    
Credit loss from contract with customer [Abstract]                        
Accounts Receivable, Credit Loss Expense (Reversal)                 27 34    
Contract with Customer, Asset and Liability [Abstract]                        
Contract with Customer, Liability 44       42       44 42 29  
Contract with Customer, Liability, Revenue Recognized                 32 21    
Licensed energy supplier [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 2,032 2,127    
Residential [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 2,610 2,704    
Commercial [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 1,257 1,233    
Industrial [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 621 624    
Other [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 495 489    
Wholesale Municipal [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 43 118    
Wholesale Other [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 49 79    
Transmission [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 594 405    
Pennsylvania Regulated [Member]                        
Revenue from contracts with customers [Line Items]                        
Operating Revenues                 $ 2,358 2,277 2,195  
Number Of Days Due From Invoice Date | Days                 21      
U.K. Regulated [Member]                        
Revenue from contracts with customers [Line Items]                        
Operating Revenues                 $ 2,167 2,268 2,091  
Number Of Days Due From Invoice Date | Days                 14      
Kentucky Regulated [Member]                        
Revenue from contracts with customers [Line Items]                        
Operating Revenues                 $ 3,206 3,214 3,156  
Number Of Days Due From Invoice Date | Days                 22      
Corporate Segment [Member]                        
Revenue from contracts with customers [Line Items]                        
Operating Revenues                 $ 38 26 5  
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]: 2019-12-31 | Corporate Segment [Member]                        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]                        
Revenue, Remaining Performance Obligation, Amount 36               $ 36      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-12-31 | Corporate Segment [Member] | Forecast [Member]                        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]                        
Revenue, Remaining Performance Obligation, Amount                       $ 32
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period                       12 months
PPL Electric Utilities Corp [Member]                        
Revenue from contracts with customers [Line Items]                        
Operating Revenues 602 $ 590 $ 521 $ 645 573 $ 548 $ 517 $ 639 $ 2,358 2,277 2,195  
Number Of Days Due From Invoice Date | Days                 21      
Reconciliation of Revenue from Contracts with Customers [Abstract]                        
Alternative Revenue Programs                 $ (6) (6)    
Other Revenue                 (10) (12)    
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 2,342 2,259    
Credit loss from contract with customer [Abstract]                        
Accounts Receivable, Credit Loss Expense (Reversal)                 21 24    
Contract with Customer, Asset and Liability [Abstract]                        
Contract with Customer, Liability 21       23       21 23 19  
Contract with Customer, Liability, Revenue Recognized                 11 8    
PPL Electric Utilities Corp [Member] | Licensed energy supplier [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 0 0    
PPL Electric Utilities Corp [Member] | Residential [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 1,288 1,379    
PPL Electric Utilities Corp [Member] | Commercial [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 349 368    
PPL Electric Utilities Corp [Member] | Industrial [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 59 54    
PPL Electric Utilities Corp [Member] | Other [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 52 53    
PPL Electric Utilities Corp [Member] | Wholesale Municipal [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 0 0    
PPL Electric Utilities Corp [Member] | Wholesale Other [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 0 0    
PPL Electric Utilities Corp [Member] | Distribution [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 1,700 1,900    
PPL Electric Utilities Corp [Member] | Transmission [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 594 405    
LG And E And KU Energy LLC [Member]                        
Revenue from contracts with customers [Line Items]                        
Operating Revenues                 3,206 3,214 3,156  
Reconciliation of Revenue from Contracts with Customers [Abstract]                        
Alternative Revenue Programs                 (24) 38    
Other Revenue                 (21) (17)    
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 3,161 3,235    
Credit loss from contract with customer [Abstract]                        
Accounts Receivable, Credit Loss Expense (Reversal)                 6 9    
Contract with Customer, Asset and Liability [Abstract]                        
Contract with Customer, Liability 9       9       9 9 8  
Contract with Customer, Liability, Revenue Recognized                 9 8    
LG And E And KU Energy LLC [Member] | Licensed energy supplier [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 0 0    
LG And E And KU Energy LLC [Member] | Residential [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 1,322 1,325    
LG And E And KU Energy LLC [Member] | Commercial [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 908 865    
LG And E And KU Energy LLC [Member] | Industrial [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 562 570    
LG And E And KU Energy LLC [Member] | Other [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 277 278    
LG And E And KU Energy LLC [Member] | Wholesale Municipal [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 43 118    
LG And E And KU Energy LLC [Member] | Wholesale Other [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 49 79    
LG And E And KU Energy LLC [Member] | Transmission [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 $ 0 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                 $ 1,500 1,496 1,453  
Number Of Days Due From Invoice Date | Days                 22      
Reconciliation of Revenue from Contracts with Customers [Abstract]                        
Alternative Revenue Programs                 $ (10) 12    
Other Revenue                 (9) (5)    
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 1,481 1,503    
Credit loss from contract with customer [Abstract]                        
Accounts Receivable, Credit Loss Expense (Reversal)                 2 4    
Contract with Customer, Asset and Liability [Abstract]                        
Contract with Customer, Liability 5       5       5 5 4  
Contract with Customer, Liability, Revenue Recognized                 5 4    
Louisville Gas And Electric Co [Member] | Licensed energy supplier [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 0 0    
Louisville Gas And Electric Co [Member] | Residential [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 668 666    
Louisville Gas And Electric Co [Member] | Commercial [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 466 455    
Louisville Gas And Electric Co [Member] | Industrial [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 180 180    
Louisville Gas And Electric Co [Member] | Other [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 121 129    
Louisville Gas And Electric Co [Member] | Wholesale Municipal [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 0 0    
Louisville Gas And Electric Co [Member] | Wholesale Other [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 46 73    
Louisville Gas And Electric Co [Member] | Transmission [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 0 0    
Kentucky Utilities Co [Member]                        
Revenue from contracts with customers [Line Items]                        
Operating Revenues                 $ 1,740 1,760 1,744  
Number Of Days Due From Invoice Date | Days                 22      
Reconciliation of Revenue from Contracts with Customers [Abstract]                        
Alternative Revenue Programs                 $ (14) 26    
Other Revenue                 (12) (12)    
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 1,714 1,774    
Credit loss from contract with customer [Abstract]                        
Accounts Receivable, Credit Loss Expense (Reversal)                 4 5    
Contract with Customer, Asset and Liability [Abstract]                        
Contract with Customer, Liability $ 4       $ 4       4 4 $ 4  
Contract with Customer, Liability, Revenue Recognized                 4 4    
Kentucky Utilities Co [Member] | Licensed energy supplier [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 0 0    
Kentucky Utilities Co [Member] | Residential [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 654 659    
Kentucky Utilities Co [Member] | Commercial [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 442 410    
Kentucky Utilities Co [Member] | Industrial [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 382 390    
Kentucky Utilities Co [Member] | Other [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 156 149    
Kentucky Utilities Co [Member] | Wholesale Municipal [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 43 118    
Kentucky Utilities Co [Member] | Wholesale Other [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 37 48    
Kentucky Utilities Co [Member] | Transmission [Member]                        
Disaggregation of Revenue [Abstract]                        
Revenue from Contracts with Customers                 $ 0 $ 0