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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 |  |  |

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