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Revenue from Contracts with Customers (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Days
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Revenue from Contracts with Customers [Line Items]      
Operating Revenues $ 2,126 $ 1,951  
Reconciliation of Revenue from Contracts with Customers [Abstract]      
Alternative Revenue Programs 32    
Other Revenue (16)    
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 2,142    
Credit Loss from Contracts with Customers [Abstract]      
Provision for Doubtful Accounts 10    
Contract with Customer, Asset and Liability [Abstract]      
Contract with Customer, Liability 20   $ 29
Contract with Customer, Liability, Revenue Recognized 17    
Licensed energy suppliers [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 584    
Residential [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 804    
Commercial [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 325    
Industrial [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 155    
Other [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 105    
Wholesale - municipal [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 30    
Wholesale - other [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 34    
Transmission [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 105    
Pennsylvania Regulated [Member]      
Revenue from Contracts with Customers [Line Items]      
Operating Revenues $ 639 573  
Number Of Days Due From Invoice Date | Days 21    
United Kingdom Regulated [Member]      
Revenue from Contracts with Customers [Line Items]      
Operating Revenues $ 615 568  
Number Of Days Due From Invoice Date | Days 14    
Kentucky Regulated [Member]      
Revenue from Contracts with Customers [Line Items]      
Operating Revenues $ 872 809  
Number Of Days Due From Invoice Date | Days 22    
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 $ 639 573  
Number Of Days Due From Invoice Date | Days 21    
Reconciliation of Revenue from Contracts with Customers [Abstract]      
Alternative Revenue Programs $ 2    
Other Revenue (4)    
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 637    
Credit Loss from Contracts with Customers [Abstract]      
Provision for Doubtful Accounts 7    
Contract with Customer, Asset and Liability [Abstract]      
Contract with Customer, Liability 11   19
Contract with Customer, Liability, Revenue Recognized 8    
PPL Electric Utilities Corp [Member] | Licensed energy suppliers [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 408    
PPL Electric Utilities Corp [Member] | Commercial [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 98    
PPL Electric Utilities Corp [Member] | Industrial [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 13    
PPL Electric Utilities Corp [Member] | Other [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 13    
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 532    
PPL Electric Utilities Corp [Member] | Transmission [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 105    
PPL Electric Utilities Corp [Member] | Pennsylvania Regulated [Member]      
Revenue from Contracts with Customers [Line Items]      
Operating Revenues 639    
LG And E And KU Energy LLC [Member]      
Revenue from Contracts with Customers [Line Items]      
Operating Revenues 872 809  
Reconciliation of Revenue from Contracts with Customers [Abstract]      
Alternative Revenue Programs 30    
Other Revenue (5)    
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 897    
Credit Loss from Contracts with Customers [Abstract]      
Provision for Doubtful Accounts 2    
Contract with Customer, Asset and Liability [Abstract]      
Contract with Customer, Liability 7   8
Contract with Customer, Liability, Revenue Recognized 8    
LG And E And KU Energy LLC [Member] | Licensed energy suppliers [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 396    
LG And E And KU Energy LLC [Member] | Commercial [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 227    
LG And E And KU Energy LLC [Member] | Industrial [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 142    
LG And E And KU Energy LLC [Member] | Other [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 68    
LG And E And KU Energy LLC [Member] | Wholesale - municipal [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 30    
LG And E And KU Energy LLC [Member] | Wholesale - other [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 34    
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] | Kentucky Regulated [Member]      
Revenue from Contracts with Customers [Line Items]      
Operating Revenues $ 872    
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 $ 419 391  
Number Of Days Due From Invoice Date | Days 22    
Reconciliation of Revenue from Contracts with Customers [Abstract]      
Alternative Revenue Programs $ 14    
Other Revenue (1)    
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 432    
Credit Loss from Contracts with Customers [Abstract]      
Provision for Doubtful Accounts 1    
Contract with Customer, Asset and Liability [Abstract]      
Contract with Customer, Liability 3   4
Contract with Customer, Liability, Revenue Recognized 4    
Louisville Gas And Electric Co [Member] | Licensed energy suppliers [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 197    
Louisville Gas And Electric Co [Member] | Commercial [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 124    
Louisville Gas And Electric Co [Member] | Industrial [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 44    
Louisville Gas And Electric Co [Member] | Other [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 31    
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 36    
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 $ 471 $ 437  
Number Of Days Due From Invoice Date | Days 22    
Reconciliation of Revenue from Contracts with Customers [Abstract]      
Alternative Revenue Programs $ 16    
Other Revenue (4)    
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 483    
Credit Loss from Contracts with Customers [Abstract]      
Provision for Doubtful Accounts 1    
Contract with Customer, Asset and Liability [Abstract]      
Contract with Customer, Liability 4   $ 4
Contract with Customer, Liability, Revenue Recognized 4    
Kentucky Utilities Co [Member] | Licensed energy suppliers [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 199    
Kentucky Utilities Co [Member] | Commercial [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 103    
Kentucky Utilities Co [Member] | Industrial [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 98    
Kentucky Utilities Co [Member] | Other [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 37    
Kentucky Utilities Co [Member] | Wholesale - municipal [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 30    
Kentucky Utilities Co [Member] | Wholesale - other [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers 16    
Kentucky Utilities Co [Member] | Transmission [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from Contracts with Customers $ 0