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Revenue from Contracts with Customers (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Days
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Revenue from contracts with customers [Line Items]        
Operating Revenues $ 7,607 $ 7,769 $ 7,785  
Reconciliation of Revenue from Contracts with Customers [Abstract]        
Alternative Revenue Programs (24) (30) 32  
Other Revenue (27) (38) (38)  
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 7,556 7,701 7,779  
Credit loss from contract with customer [Abstract]        
Accounts Receivable, Credit Loss Expense (Reversal) 29 27 34  
Contract with Customer, Asset and Liability [Abstract]        
Contract with Customer, Liability 48 44 42 $ 29
Contract with Customer, Liability, Revenue Recognized 29 32 21  
Licensed energy supplier [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 1,990 2,032 2,127  
Residential [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 2,585 2,610 2,704  
Commercial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 1,185 1,257 1,233  
Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 582 621 624  
Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 484 495 489  
Wholesale Municipal [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 20 43 118  
Wholesale Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 40 49 79  
Transmission [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 670 594 405  
Pennsylvania Regulated [Member]        
Revenue from contracts with customers [Line Items]        
Operating Revenues $ 2,330 2,358 2,277  
Number Of Days Due From Invoice Date | Days 21      
U.K. Regulated [Member]        
Revenue from contracts with customers [Line Items]        
Operating Revenues $ 2,133 2,167 2,268  
Number Of Days Due From Invoice Date | Days 14      
Kentucky Regulated [Member]        
Revenue from contracts with customers [Line Items]        
Operating Revenues $ 3,106 3,206 3,214  
Number Of Days Due From Invoice Date | Days 22      
Corporate Segment [Member]        
Revenue from contracts with customers [Line Items]        
Operating Revenues $ 38 38 26  
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      
PPL Electric Utilities Corp [Member]        
Revenue from contracts with customers [Line Items]        
Operating Revenues $ 2,331 2,358 2,277  
Number Of Days Due From Invoice Date | Days 21      
Reconciliation of Revenue from Contracts with Customers [Abstract]        
Alternative Revenue Programs $ (12) (6) (6)  
Other Revenue (3) (10) (12)  
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 2,316 2,342 2,259  
Credit loss from contract with customer [Abstract]        
Accounts Receivable, Credit Loss Expense (Reversal) 17 21 24  
Contract with Customer, Asset and Liability [Abstract]        
Contract with Customer, Liability 23 21 23 19
Contract with Customer, Liability, Revenue Recognized 9 11 8  
PPL Electric Utilities Corp [Member] | Licensed energy supplier [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
PPL Electric Utilities Corp [Member] | Residential [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 1,238 1,288 1,379  
PPL Electric Utilities Corp [Member] | Commercial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 314 349 368  
PPL Electric Utilities Corp [Member] | Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 44 59 54  
PPL Electric Utilities Corp [Member] | Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 50 52 53  
PPL Electric Utilities Corp [Member] | Wholesale Municipal [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
PPL Electric Utilities Corp [Member] | Wholesale Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
PPL Electric Utilities Corp [Member] | Transmission [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 670 594 405  
LG And E And KU Energy LLC [Member]        
Revenue from contracts with customers [Line Items]        
Operating Revenues 3,106 3,206 3,214  
Reconciliation of Revenue from Contracts with Customers [Abstract]        
Alternative Revenue Programs (12) (24) 38  
Other Revenue (17) (21) (17)  
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 3,077 3,161 3,235  
Credit loss from contract with customer [Abstract]        
Accounts Receivable, Credit Loss Expense (Reversal) 8 6 9  
Contract with Customer, Asset and Liability [Abstract]        
Contract with Customer, Liability 11 9 9 8
Contract with Customer, Liability, Revenue Recognized 9 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 0  
LG And E And KU Energy LLC [Member] | Residential [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 1,347 1,322 1,325  
LG And E And KU Energy LLC [Member] | Commercial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 871 908 865  
LG And E And KU Energy LLC [Member] | Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 538 562 570  
LG And E And KU Energy LLC [Member] | Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 261 277 278  
LG And E And KU Energy LLC [Member] | Wholesale Municipal [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 20 43 118  
LG And E And KU Energy LLC [Member] | Wholesale Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 40 49 79  
LG And E And KU Energy LLC [Member] | Transmission [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers $ 0 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 $ 1,456 1,500 1,496  
Number Of Days Due From Invoice Date | Days 22      
Reconciliation of Revenue from Contracts with Customers [Abstract]        
Alternative Revenue Programs $ (8) (10) 12  
Other Revenue (7) (9) (5)  
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 1,441 1,481 1,503  
Credit loss from contract with customer [Abstract]        
Accounts Receivable, Credit Loss Expense (Reversal) 4 2 4  
Contract with Customer, Asset and Liability [Abstract]        
Contract with Customer, Liability 5 5 5 4
Contract with Customer, Liability, Revenue Recognized 5 5 4  
Louisville Gas And Electric Co [Member] | Licensed energy supplier [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
Louisville Gas And Electric Co [Member] | Residential [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 676 668 666  
Louisville Gas And Electric Co [Member] | Commercial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 444 466 455  
Louisville Gas And Electric Co [Member] | Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 173 180 180  
Louisville Gas And Electric Co [Member] | Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 114 121 129  
Louisville Gas And Electric Co [Member] | Wholesale Municipal [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
Louisville Gas And Electric Co [Member] | Wholesale Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 34 46 73  
Louisville Gas And Electric Co [Member] | Transmission [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
Kentucky Utilities Co [Member]        
Revenue from contracts with customers [Line Items]        
Operating Revenues $ 1,690 1,740 1,760  
Number Of Days Due From Invoice Date | Days 22      
Reconciliation of Revenue from Contracts with Customers [Abstract]        
Alternative Revenue Programs $ (4) (14) 26  
Other Revenue (10) (12) (12)  
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 1,676 1,714 1,774  
Credit loss from contract with customer [Abstract]        
Accounts Receivable, Credit Loss Expense (Reversal) 4 4 5  
Contract with Customer, Asset and Liability [Abstract]        
Contract with Customer, Liability 6 4 4 $ 4
Contract with Customer, Liability, Revenue Recognized 4 4 4  
Kentucky Utilities Co [Member] | Licensed energy supplier [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
Kentucky Utilities Co [Member] | Residential [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 671 654 659  
Kentucky Utilities Co [Member] | Commercial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 427 442 410  
Kentucky Utilities Co [Member] | Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 365 382 390  
Kentucky Utilities Co [Member] | Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 147 156 149  
Kentucky Utilities Co [Member] | Wholesale Municipal [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 20 43 118  
Kentucky Utilities Co [Member] | Wholesale Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 46 37 48  
Kentucky Utilities Co [Member] | Transmission [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers $ 0 $ 0 $ 0