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Revenue from Contracts with Customers (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Days
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Revenue from Contracts with Customers [Line Items]          
Operating Revenues $ 1,872 $ 1,845 $ 5,846 $ 5,521  
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Alternative Revenue Programs (4)   37    
Other Revenue (15)   (43)    
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 1,853   5,840    
Credit Loss from Contracts with Customers [Abstract]          
Provision for Doubtful Accounts 11   24    
Contract with Customer, Asset and Liability [Abstract]          
Contract with Customer, Liability 40   40   $ 29
Contract with Customer, Liability, Revenue Recognized     22    
Licensed energy suppliers [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 475   1,606    
Residential [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 647   2,039    
Commercial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 307   928    
Industrial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 156   466    
Other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 119   339    
Wholesale - municipal [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 30   91    
Wholesale - other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 19   65    
Transmission [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 100   306    
Pennsylvania Regulated [Member]          
Revenue from Contracts with Customers [Line Items]          
Operating Revenues 548 547 $ 1,704 1,620  
Number Of Days Due From Invoice Date | Days     21    
United Kingdom Regulated [Member]          
Revenue from Contracts with Customers [Line Items]          
Operating Revenues 517 477 $ 1,716 1,547  
Number Of Days Due From Invoice Date | Days     14    
Kentucky Regulated [Member]          
Revenue from Contracts with Customers [Line Items]          
Operating Revenues 802 818 $ 2,417 2,350  
Number Of Days Due From Invoice Date | Days     22    
Corporate and Other [Member]          
Revenue from Contracts with Customers [Line Items]          
Revenue, Remaining Performance Obligation, Amount 65   $ 65    
Operating Revenues $ 5 3 9 4  
Contract with Customer, Asset and Liability [Abstract]          
Contract with Customer, Liability, Revenue Recognized     $ 44    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 12 months   12 months    
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 $ 548 547 $ 1,704 1,620  
Number Of Days Due From Invoice Date | Days     21    
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Alternative Revenue Programs (3)   $ 1    
Other Revenue (3)   9    
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 542   1,694    
Credit Loss from Contracts with Customers [Abstract]          
Provision for Doubtful Accounts 7   17    
Contract with Customer, Asset and Liability [Abstract]          
Contract with Customer, Liability 17   17   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   0    
PPL Electric Utilities Corp [Member] | Residential [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 328   1,036    
PPL Electric Utilities Corp [Member] | Commercial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 88   275    
PPL Electric Utilities Corp [Member] | Industrial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 12   37    
PPL Electric Utilities Corp [Member] | Other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 14   40    
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 442   1,400    
PPL Electric Utilities Corp [Member] | Transmission [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 100   306    
LG And E And KU Energy LLC [Member]          
Revenue from Contracts with Customers [Line Items]          
Operating Revenues 802 818 2,417 2,350  
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Alternative Revenue Programs (1)   38    
Other Revenue (5)   (14)    
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 796   2,441    
Credit Loss from Contracts with Customers [Abstract]          
Provision for Doubtful Accounts 4   7    
Contract with Customer, Asset and Liability [Abstract]          
Contract with Customer, Liability 8   8   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   0    
LG And E And KU Energy LLC [Member] | Residential [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 319   1,003    
LG And E And KU Energy LLC [Member] | Commercial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 219   653    
LG And E And KU Energy LLC [Member] | Industrial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 144   429    
LG And E And KU Energy LLC [Member] | Other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 65   200    
LG And E And KU Energy LLC [Member] | Wholesale - municipal [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 30   91    
LG And E And KU Energy LLC [Member] | Wholesale - other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 19   65    
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 362 363 $ 1,116 1,078  
Number Of Days Due From Invoice Date | Days     22    
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Alternative Revenue Programs (4)   $ 16    
Other Revenue (2)   (5)    
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 356   1,127    
Credit Loss from Contracts with Customers [Abstract]          
Provision for Doubtful Accounts 2   3    
Contract with Customer, Asset and Liability [Abstract]          
Contract with Customer, Liability 4   4   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   0    
Louisville Gas And Electric Co [Member] | Residential [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 162   505    
Louisville Gas And Electric Co [Member] | Commercial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 112   343    
Louisville Gas And Electric Co [Member] | Industrial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 45   134    
Louisville Gas And Electric Co [Member] | Other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 27   88    
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 10   57    
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 447 $ 460 $ 1,332 $ 1,303  
Number Of Days Due From Invoice Date | Days     22    
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Alternative Revenue Programs 3   $ 22    
Other Revenue (3)   (9)    
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 447   1,345    
Credit Loss from Contracts with Customers [Abstract]          
Provision for Doubtful Accounts 2   4    
Contract with Customer, Asset and Liability [Abstract]          
Contract with Customer, Liability 4   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   0    
Kentucky Utilities Co [Member] | Residential [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 157   498    
Kentucky Utilities Co [Member] | Commercial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 107   310    
Kentucky Utilities Co [Member] | Industrial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 99   295    
Kentucky Utilities Co [Member] | Other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 39   113    
Kentucky Utilities Co [Member] | Wholesale - municipal [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 30   91    
Kentucky Utilities Co [Member] | Wholesale - other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 15   38    
Kentucky Utilities Co [Member] | Transmission [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers $ 0   $ 0