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Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Operating Revenues $ 2,079 $ 2,126      
Alternative Revenue Programs (6) (32)      
Other Revenue (10) 16      
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 2,063 2,142      
Contract with Customer, Asset and Liability [Abstract]          
Provision for Doubtful Accounts 9 10      
Contract with Customer, Liability 37 20   $ 42 $ 29
Contract with Customer, Liability, Revenue Recognized 25 17      
Licensed energy suppliers [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 556 584      
Residential [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 778 804      
Commercial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 319 325      
Industrial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 150 155      
Other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 114 105      
Wholesale - municipal [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 28 30      
Wholesale - other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 13 34      
Transmission [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 105 105      
Pennsylvania Regulated [Member]          
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Operating Revenues 645 639      
United Kingdom Regulated [Member]          
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Operating Revenues 583 615      
Kentucky Regulated [Member]          
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Operating Revenues 845 872      
Corporate and Other [Member]          
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Operating Revenues 6 0      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-03-31 | Corporate and Other [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount 46        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-03-31 | Corporate and Other [Member] | Forecast [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount     $ 26    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period     12 months    
PPL Electric Utilities Corp [Member]          
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Operating Revenues 645 639      
Alternative Revenue Programs (4) (2)      
Other Revenue (3) 4      
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 638 637      
Contract with Customer, Asset and Liability [Abstract]          
Provision for Doubtful Accounts 6 7      
Contract with Customer, Liability 14 11   23 19
Contract with Customer, Liability, Revenue Recognized 11 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 407 408      
PPL Electric Utilities Corp [Member] | Commercial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 95 98      
PPL Electric Utilities Corp [Member] | Industrial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 17 13      
PPL Electric Utilities Corp [Member] | Other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 14 13      
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 533 532      
PPL Electric Utilities Corp [Member] | Transmission [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 105 105      
LG And E And KU Energy LLC [Member]          
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Operating Revenues 845 872      
Alternative Revenue Programs (2) (30)      
Other Revenue (4) 5      
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 839 897      
Contract with Customer, Asset and Liability [Abstract]          
Provision for Doubtful Accounts 2 2      
Contract with Customer, Liability 7 7   9 8
Contract with Customer, Liability, Revenue Recognized 9 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 371 396      
LG And E And KU Energy LLC [Member] | Commercial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 224 227      
LG And E And KU Energy LLC [Member] | Industrial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 133 142      
LG And E And KU Energy LLC [Member] | Other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 70 68      
LG And E And KU Energy LLC [Member] | Wholesale - municipal [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 28 30      
LG And E And KU Energy LLC [Member] | Wholesale - other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 13 34      
LG And E And KU Energy LLC [Member] | Transmission [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 0 0      
Louisville Gas And Electric Co [Member]          
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Operating Revenues 410 419      
Alternative Revenue Programs (2) (14)      
Other Revenue (1) 1      
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 407 432      
Contract with Customer, Asset and Liability [Abstract]          
Provision for Doubtful Accounts 1 1      
Contract with Customer, Liability 4 3   5 4
Contract with Customer, Liability, Revenue Recognized 5 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 189 197      
Louisville Gas And Electric Co [Member] | Commercial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 121 124      
Louisville Gas And Electric Co [Member] | Industrial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 44 44      
Louisville Gas And Electric Co [Member] | Other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 33 31      
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 20 36      
Louisville Gas And Electric Co [Member] | Transmission [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 0 0      
Kentucky Utilities Co [Member]          
Reconciliation of Revenue from Contracts with Customers [Abstract]          
Operating Revenues 450 471      
Alternative Revenue Programs 0 (16)      
Other Revenue (3) 4      
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 447 483      
Contract with Customer, Asset and Liability [Abstract]          
Provision for Doubtful Accounts 1 1      
Contract with Customer, Liability 3 4   $ 4 $ 4
Contract with Customer, Liability, Revenue Recognized 4 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 182 199      
Kentucky Utilities Co [Member] | Commercial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 103 103      
Kentucky Utilities Co [Member] | Industrial [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 89 98      
Kentucky Utilities Co [Member] | Other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 37 37      
Kentucky Utilities Co [Member] | Wholesale - municipal [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 28 30      
Kentucky Utilities Co [Member] | Wholesale - other [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers 8 16      
Kentucky Utilities Co [Member] | Transmission [Member]          
Disaggregation of Revenue [Abstract]          
Revenue from Contracts with Customers $ 0 $ 0