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Revenue from Contracts with Customers (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Days
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Revenue from contracts with customers [Line Items]        
Operating Revenues $ 5,783 $ 5,474 $ 5,602  
Reconciliation of Revenue from Contracts with Customers [Abstract]        
Alternative Revenue Programs 77 (24) (30)  
Other Revenue (22) (21) (31)  
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 5,838 5,429 5,541  
Credit loss from contract with customer [Abstract]        
Accounts Receivable, Credit Loss Expense (Reversal) 22 25 27  
Contract with Customer, Asset and Liability [Abstract]        
Contract with Customer, Liability 42 40 37 $ 40
Contract with Customer, Liability, Revenue Recognized 24 22 25  
Residential [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 2,715 2,585 2,610  
Commercial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 1,278 1,185 1,257  
Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 639 582 621  
Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 386 347 367  
Wholesale Municipal [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 24 20 43  
Wholesale Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 66 40 49  
Transmission [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 730 670 594  
Pennsylvania Regulated [Member]        
Revenue from contracts with customers [Line Items]        
Operating Revenues $ 2,402 2,330 2,358  
Number Of Days Due From Invoice Date | Days 21      
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers $ 2,482 2,316 2,342  
Pennsylvania Regulated [Member] | Residential [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 1,299 1,238 1,288  
Pennsylvania Regulated [Member] | Commercial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 350 314 349  
Pennsylvania Regulated [Member] | Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 53 44 59  
Pennsylvania Regulated [Member] | Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 50 50 52  
Pennsylvania Regulated [Member] | Wholesale Municipal [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
Pennsylvania Regulated [Member] | Wholesale Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
Pennsylvania Regulated [Member] | Transmission [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 730 670 594  
Kentucky Regulated [Member]        
Revenue from contracts with customers [Line Items]        
Operating Revenues $ 3,348 3,106 3,206  
Number Of Days Due From Invoice Date | Days 22      
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers $ 3,325 3,077 3,161  
Kentucky Regulated [Member] | Residential [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 1,416 1,347 1,322  
Kentucky Regulated [Member] | Commercial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 928 871 908  
Kentucky Regulated [Member] | Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 586 538 562  
Kentucky Regulated [Member] | Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 305 261 277  
Kentucky Regulated [Member] | Wholesale Municipal [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 24 20 43  
Kentucky Regulated [Member] | Wholesale Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 66 40 49  
Kentucky Regulated [Member] | Transmission [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
Corporate Segment [Member]        
Revenue from contracts with customers [Line Items]        
Operating Revenues 33 38 38  
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 31 36 38  
Corporate Segment [Member] | Residential [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
Corporate Segment [Member] | Commercial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
Corporate Segment [Member] | Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
Corporate Segment [Member] | Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 31 36 38  
Corporate Segment [Member] | Wholesale Municipal [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
Corporate Segment [Member] | Wholesale Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 0 0 0  
Corporate Segment [Member] | Transmission [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers $ 0 0 0  
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 $ 2,402 2,331 2,358  
Number Of Days Due From Invoice Date | Days 21      
Reconciliation of Revenue from Contracts with Customers [Abstract]        
Alternative Revenue Programs $ 83 (12) (6)  
Other Revenue (3) (3) (10)  
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 2,482 2,316 2,342  
Credit loss from contract with customer [Abstract]        
Accounts Receivable, Credit Loss Expense (Reversal) 10 17 21  
Contract with Customer, Asset and Liability [Abstract]        
Contract with Customer, Liability 25 23 21 23
Contract with Customer, Liability, Revenue Recognized 11 9 11  
Revenue Reserve for ROE Challenge 78      
PPL Electric Utilities Corp [Member] | Residential [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 1,299 1,238 1,288  
PPL Electric Utilities Corp [Member] | Commercial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 350 314 349  
PPL Electric Utilities Corp [Member] | Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 53 44 59  
PPL Electric Utilities Corp [Member] | Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 50 50 52  
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 730 670 594  
Louisville Gas And Electric Co [Member]        
Revenue from contracts with customers [Line Items]        
Operating Revenues $ 1,569 1,456 1,500  
Number Of Days Due From Invoice Date | Days 22      
Reconciliation of Revenue from Contracts with Customers [Abstract]        
Alternative Revenue Programs $ (3) (8) (10)  
Other Revenue (8) (7) (9)  
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 1,558 1,441 1,481  
Credit loss from contract with customer [Abstract]        
Accounts Receivable, Credit Loss Expense (Reversal) 4 4 2  
Contract with Customer, Asset and Liability [Abstract]        
Contract with Customer, Liability 6 5 5 5
Contract with Customer, Liability, Revenue Recognized 5 5 5  
Louisville Gas And Electric Co [Member] | Residential [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 711 676 668  
Louisville Gas And Electric Co [Member] | Commercial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 473 444 466  
Louisville Gas And Electric Co [Member] | Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 180 173 180  
Louisville Gas And Electric Co [Member] | Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 145 114 121  
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 49 34 46  
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 $ 1,826 1,690 1,740  
Number Of Days Due From Invoice Date | Days 22      
Reconciliation of Revenue from Contracts with Customers [Abstract]        
Alternative Revenue Programs $ (3) (4) (14)  
Other Revenue (9) (10) (12)  
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 1,814 1,676 1,714  
Credit loss from contract with customer [Abstract]        
Accounts Receivable, Credit Loss Expense (Reversal) 8 4 4  
Contract with Customer, Asset and Liability [Abstract]        
Contract with Customer, Liability 6 6 4 $ 4
Contract with Customer, Liability, Revenue Recognized 6 4 4  
Kentucky Utilities Co [Member] | Residential [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 705 671 654  
Kentucky Utilities Co [Member] | Commercial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 455 427 442  
Kentucky Utilities Co [Member] | Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 406 365 382  
Kentucky Utilities Co [Member] | Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 160 147 156  
Kentucky Utilities Co [Member] | Wholesale Municipal [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 24 20 43  
Kentucky Utilities Co [Member] | Wholesale Other [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers 64 46 37  
Kentucky Utilities Co [Member] | Transmission [Member]        
Disaggregation of Revenue [Abstract]        
Revenue from Contracts with Customers $ 0 $ 0 $ 0