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Revenue from Contracts with Customers (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Days | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Revenue from Contracts with Customers [Line Items] |  |  |  |  |
Operating Revenues | $ 1,848 | $ 1,725 | $ 3,974 | $ 3,676 |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |
Alternative Revenue Programs | 9 |  | 41 |  |
Other Revenue | (13) |  | (28) |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 1,844 |  | 3,987 |  |
Credit Loss from Contracts with Customers [Abstract] |  |  |  |  |
Provision for Doubtful Accounts | 3 |  | 13 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |
Contract with Customer, Liability | 38 |  | 38 |  | $ 29
Contract with Customer, Liability, Revenue Recognized |  |  | 18 |  |
Licensed energy suppliers [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 547 |  | 1,131 |  |
Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 588 |  | 1,392 |  |
Commercial [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 296 |  | 621 |  |
Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 155 |  | 310 |  |
Other [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 114 |  | 220 |  |
Wholesale - municipal [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 31 |  | 61 |  |
Wholesale - other [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 12 |  | 46 |  |
Transmission [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 101 |  | 206 |  |
Pennsylvania Regulated [Member] |  |  |  |  |
Revenue from Contracts with Customers [Line Items] |  |  |  |  |
Operating Revenues | 517 | 500 | $ 1,156 | 1,073 |
Number Of Days Due From Invoice Date | Days |  |  | 21 |  |
United Kingdom Regulated [Member] |  |  |  |  |
Revenue from Contracts with Customers [Line Items] |  |  |  |  |
Operating Revenues | 584 | 502 | $ 1,199 | 1,070 |
Number Of Days Due From Invoice Date | Days |  |  | 14 |  |
Kentucky Regulated [Member] |  |  |  |  |
Revenue from Contracts with Customers [Line Items] |  |  |  |  |
Operating Revenues | 743 | 723 | $ 1,615 | 1,532 |
Number Of Days Due From Invoice Date | Days |  |  | 22 |  |
Corporate and Other [Member] |  |  |  |  |
Revenue from Contracts with Customers [Line Items] |  |  |  |  |
Revenue, Remaining Performance Obligation | 70 |  | $ 70 |  |
Operating Revenues | 4 | 0 | 4 | 1 |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |
Contract with Customer, Liability, Revenue Recognized |  |  | $ 50 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  |  | 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 | 517 | 500 | $ 1,156 | 1,073 |
Number Of Days Due From Invoice Date | Days |  |  | 21 |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |
Alternative Revenue Programs | 0 |  | $ (2) |  |
Other Revenue | (2) |  | 6 |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 515 |  | 1,152 |  |
Credit Loss from Contracts with Customers [Abstract] |  |  |  |  |
Provision for Doubtful Accounts | 3 |  | 10 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |
Contract with Customer, Liability | 14 |  | 14 |  | 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 | 300 |  | 708 |  |
PPL Electric Utilities Corp [Member] | Commercial [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 89 |  | 187 |  |
PPL Electric Utilities Corp [Member] | Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 12 |  | 25 |  |
PPL Electric Utilities Corp [Member] | Other [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 13 |  | 26 |  |
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 | 414 |  | 946 |  |
PPL Electric Utilities Corp [Member] | Transmission [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 101 |  | 206 |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |
Revenue from Contracts with Customers [Line Items] |  |  |  |  |
Operating Revenues | 743 | 723 | 1,615 | 1,532 |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |
Alternative Revenue Programs | 9 |  | 39 |  |
Other Revenue | (4) |  | (9) |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 748 |  | 1,645 |  |
Credit Loss from Contracts with Customers [Abstract] |  |  |  |  |
Provision for Doubtful Accounts | 1 |  | 3 |  |
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 | 288 |  | 684 |  |
LG And E And KU Energy LLC [Member] | Commercial [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 207 |  | 434 |  |
LG And E And KU Energy LLC [Member] | Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 143 |  | 285 |  |
LG And E And KU Energy LLC [Member] | Other [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 67 |  | 135 |  |
LG And E And KU Energy LLC [Member] | Wholesale - municipal [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 31 |  | 61 |  |
LG And E And KU Energy LLC [Member] | Wholesale - other [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 12 |  | 46 |  |
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] | 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 | 335 | 324 | $ 754 | 715 |
Number Of Days Due From Invoice Date | Days |  |  | 22 |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |
Alternative Revenue Programs | 6 |  | $ 20 |  |
Other Revenue | (2) |  | (3) |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 339 |  | 771 |  |
Credit Loss from Contracts with Customers [Abstract] |  |  |  |  |
Provision for Doubtful Accounts | 0 |  | 1 |  |
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 | 146 |  | 343 |  |
Louisville Gas And Electric Co [Member] | Commercial [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 107 |  | 231 |  |
Louisville Gas And Electric Co [Member] | Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 45 |  | 89 |  |
Louisville Gas And Electric Co [Member] | Other [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 30 |  | 61 |  |
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 | 11 |  | 47 |  |
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 | 414 | $ 406 | $ 885 | $ 843 |
Number Of Days Due From Invoice Date | Days |  |  | 22 |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |
Alternative Revenue Programs | 3 |  | $ 19 |  |
Other Revenue | (2) |  | (6) |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 415 |  | 898 |  |
Credit Loss from Contracts with Customers [Abstract] |  |  |  |  |
Provision for Doubtful Accounts | 1 |  | 2 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |
Contract with Customer, Liability | 3 |  | 3 |  | $ 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 | 142 |  | 341 |  |
Kentucky Utilities Co [Member] | Commercial [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 100 |  | 203 |  |
Kentucky Utilities Co [Member] | Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 98 |  | 196 |  |
Kentucky Utilities Co [Member] | Other [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 37 |  | 74 |  |
Kentucky Utilities Co [Member] | Wholesale - municipal [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 31 |  | 61 |  |
Kentucky Utilities Co [Member] | Wholesale - other [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | 7 |  | 23 |  |
Kentucky Utilities Co [Member] | Transmission [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenue from Contracts with Customers | $ 0 |  | $ 0 |  |

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