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Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2020
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues $ 1,933 $ 1,872 $ 5,815 $ 5,846      
Alternative Revenue Programs 8 (4) (18) 37      
Other Revenue (11) (15) (30) (43)      
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 1,930 1,853 5,767 5,840      
Contract with Customer, Asset and Liability [Abstract]              
Accounts Receivable, Credit Loss Expense (Reversal) 11 11 22 24      
Contract with Customer, Liability 42 40 42 40   $ 42 $ 29
Contract with Customer, Liability, Revenue Recognized     31 22      
Licensed energy suppliers [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 454 475 1,520 1,606      
Residential [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 708 647 2,058 2,039      
Commercial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 346 307 967 928      
Industrial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 164 156 470 466      
Other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 128 119 360 339      
Wholesale - municipal [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 6 30 38 91      
Wholesale - other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 12 19 36 65      
Transmission [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 112 100 318 306      
Pennsylvania Regulated [Member]              
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues 590 548 1,756 1,704      
United Kingdom Regulated [Member]              
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues 491 517 1,615 1,716      
Kentucky Regulated [Member]              
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues 844 802 2,421 2,417      
Corporate and Other [Member]              
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues 8 5 23 9      
Corporate and Other [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-09-30              
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]              
Revenue, Remaining Performance Obligation, Amount 48   48        
Corporate and Other [Member] | Forecast [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-09-30              
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]              
Revenue, Remaining Performance Obligation, Amount         $ 41    
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 590 548 1,756 1,704      
Alternative Revenue Programs 2 (3) (4) (1)      
Other Revenue (3) (3) (8) (9)      
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 589 542 1,744 1,694      
Contract with Customer, Asset and Liability [Abstract]              
Accounts Receivable, Credit Loss Expense (Reversal) 8 7 14 17      
Contract with Customer, Liability 19 17 19 17   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 352 328 1,060 1,036      
PPL Electric Utilities Corp [Member] | Commercial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 97 88 279 275      
PPL Electric Utilities Corp [Member] | Industrial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 16 12 48 37      
PPL Electric Utilities Corp [Member] | Other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 12 14 39 40      
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 477 442 1,400 1,400      
PPL Electric Utilities Corp [Member] | Transmission [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 112 100 318 306      
LG And E And KU Energy LLC [Member]              
Reconciliation of Revenue from Contracts with Customers [Abstract]              
Operating Revenues 844 802 2,421 2,417      
Alternative Revenue Programs 6 (1) (14) 38      
Other Revenue (6) (5) (16) (14)      
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 844 796 2,391 2,441      
Contract with Customer, Asset and Liability [Abstract]              
Accounts Receivable, Credit Loss Expense (Reversal) 2 4 5 7      
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 356 319 998 1,003      
LG And E And KU Energy LLC [Member] | Commercial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 249 219 688 653      
LG And E And KU Energy LLC [Member] | Industrial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 148 144 422 429      
LG And E And KU Energy LLC [Member] | Other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 73 65 209 200      
LG And E And KU Energy LLC [Member] | Wholesale - municipal [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 6 30 38 91      
LG And E And KU Energy LLC [Member] | Wholesale - other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 12 19 36 65      
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 382 362 1,126 1,116      
Alternative Revenue Programs 4 (4) (1) 16      
Other Revenue (3) (2) (7) (5)      
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 383 356 1,118 1,127      
Contract with Customer, Asset and Liability [Abstract]              
Accounts Receivable, Credit Loss Expense (Reversal) 1 2 2 3      
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 177 162 504 505      
Louisville Gas And Electric Co [Member] | Commercial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 123 112 352 343      
Louisville Gas And Electric Co [Member] | Industrial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 47 45 134 134      
Louisville Gas And Electric Co [Member] | Other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 31 27 93 88      
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 5 10 35 57      
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 466 447 1,322 1,332      
Alternative Revenue Programs 2 3 (13) 22      
Other Revenue (3) (3) (9) (9)      
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 465 447 1,300 1,345      
Contract with Customer, Asset and Liability [Abstract]              
Accounts Receivable, Credit Loss Expense (Reversal) 1 2 3 4      
Contract with Customer, Liability 4 4 4 4   $ 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 179 157 494 498      
Kentucky Utilities Co [Member] | Commercial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 126 107 336 310      
Kentucky Utilities Co [Member] | Industrial [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 101 99 288 295      
Kentucky Utilities Co [Member] | Other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 42 39 116 113      
Kentucky Utilities Co [Member] | Wholesale - municipal [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 6 30 38 91      
Kentucky Utilities Co [Member] | Wholesale - other [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers 11 15 28 38      
Kentucky Utilities Co [Member] | Transmission [Member]              
Disaggregation of Revenue [Abstract]              
Revenues from Contracts with Customers $ 0 $ 0 $ 0 $ 0