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Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2020
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues $ 1,803 $ 1,848 $ 3,882 $ 3,974      
Alternative Revenue Programs 20 (9) 26 (41)      
Other Revenue 10 13 19 28      
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 1,773 1,844 3,837 3,987      
Contract with Customer, Asset and Liability [Abstract]              
Accounts Receivable, Credit Loss Expense (Reversal) 2 3 11 13      
Contract with Customer, Liability 47 38 47 38   $ 42 $ 29
Contract with Customer, Liability, Revenue Recognized     29 18      
Licensed energy suppliers [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 510 547 1,066 1,131      
Residential [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 572 588 1,350 1,392      
Commercial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 302 296 621 621      
Industrial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 156 155 306 310      
Other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 117 114 232 220      
Wholesale - municipal [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 4 31 32 61      
Wholesale - other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 11 12 24 46      
Transmission [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 101 101 206 206      
Pennsylvania Regulated [Member]              
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues 521 517 1,166 1,156      
United Kingdom Regulated [Member]              
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues 541 584 1,124 1,199      
Kentucky Regulated [Member]              
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues 732 743 1,577 1,615      
Corporate and Other [Member]              
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues 9 4 15 4      
Corporate and Other [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-06-30              
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]              
Revenue, Remaining Performance Obligation, Amount 56   56        
Corporate and Other [Member] | Forecast [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-06-30              
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]              
Revenue, Remaining Performance Obligation, Amount         $ 49    
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 521 517 1,166 1,156      
Alternative Revenue Programs 2 0 6 (2)      
Other Revenue 2 2 5 6      
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 517 515 1,155 1,152      
Contract with Customer, Asset and Liability [Abstract]              
Accounts Receivable, Credit Loss Expense (Reversal) 0 3 6 10      
Contract with Customer, Liability 22 14 22 14   23 19
Contract with Customer, Liability, Revenue Recognized     11 8      
PPL Electric Utilities Corp [Member] | Licensed energy suppliers [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 0 0 0 0      
PPL Electric Utilities Corp [Member] | Residential [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 301 300 708 708      
PPL Electric Utilities Corp [Member] | Commercial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 87 89 182 187      
PPL Electric Utilities Corp [Member] | Industrial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 15 12 32 25      
PPL Electric Utilities Corp [Member] | Other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 13 13 27 26      
PPL Electric Utilities Corp [Member] | Wholesale - municipal [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 0 0 0 0      
PPL Electric Utilities Corp [Member] | Wholesale - other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 0 0 0 0      
PPL Electric Utilities Corp [Member] | Distribution [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 416 414 949 946      
PPL Electric Utilities Corp [Member] | Transmission [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 101 101 206 206      
LG And E And KU Energy LLC [Member]              
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues 732 743 1,577 1,615      
Alternative Revenue Programs 18 (9) 20 (39)      
Other Revenue 6 4 10 9      
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 708 748 1,547 1,645      
Contract with Customer, Asset and Liability [Abstract]              
Accounts Receivable, Credit Loss Expense (Reversal) 1 1 3 3      
Contract with Customer, Liability 9 8 9 8   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]              
Revenues from Contracts with Customers 0 0 0 0      
LG And E And KU Energy LLC [Member] | Residential [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 271 288 642 684      
LG And E And KU Energy LLC [Member] | Commercial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 215 207 439 434      
LG And E And KU Energy LLC [Member] | Industrial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 141 143 274 285      
LG And E And KU Energy LLC [Member] | Other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 66 67 136 135      
LG And E And KU Energy LLC [Member] | Wholesale - municipal [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 4 31 32 61      
LG And E And KU Energy LLC [Member] | Wholesale - other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 11 12 24 46      
LG And E And KU Energy LLC [Member] | Transmission [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 0 0 0 0      
Louisville Gas And Electric Co [Member]              
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues 334 335 744 754      
Alternative Revenue Programs 3 (6) 5 (20)      
Other Revenue 3 2 4 3      
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 328 339 735 771      
Contract with Customer, Asset and Liability [Abstract]              
Accounts Receivable, Credit Loss Expense (Reversal) 0 0 1 1      
Contract with Customer, Liability 5 4 5 4   5 4
Contract with Customer, Liability, Revenue Recognized     5 4      
Louisville Gas And Electric Co [Member] | Licensed energy suppliers [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 0 0 0 0      
Louisville Gas And Electric Co [Member] | Residential [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 138 146 327 343      
Louisville Gas And Electric Co [Member] | Commercial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 108 107 229 231      
Louisville Gas And Electric Co [Member] | Industrial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 43 45 87 89      
Louisville Gas And Electric Co [Member] | Other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 29 30 62 61      
Louisville Gas And Electric Co [Member] | Wholesale - municipal [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 0 0 0 0      
Louisville Gas And Electric Co [Member] | Wholesale - other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 10 11 30 47      
Louisville Gas And Electric Co [Member] | Transmission [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 0 0 0 0      
Kentucky Utilities Co [Member]              
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues 406 414 856 885      
Alternative Revenue Programs 15 (3) 15 (19)      
Other Revenue 3 2 6 6      
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 388 415 835 898      
Contract with Customer, Asset and Liability [Abstract]              
Accounts Receivable, Credit Loss Expense (Reversal) 1 1 2 2      
Contract with Customer, Liability 4 3 4 3   $ 4 $ 4
Contract with Customer, Liability, Revenue Recognized     4 4      
Kentucky Utilities Co [Member] | Licensed energy suppliers [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 0 0 0 0      
Kentucky Utilities Co [Member] | Residential [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 133 142 315 341      
Kentucky Utilities Co [Member] | Commercial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 107 100 210 203      
Kentucky Utilities Co [Member] | Industrial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 98 98 187 196      
Kentucky Utilities Co [Member] | Other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 37 37 74 74      
Kentucky Utilities Co [Member] | Wholesale - municipal [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 4 31 32 61      
Kentucky Utilities Co [Member] | Wholesale - other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 9 7 17 23      
Kentucky Utilities Co [Member] | Transmission [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers $ 0 $ 0 $ 0 $ 0