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Commitments and Contingencies (Environmental Matter and Other) (Details) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) employees | Dec. 31, 2018 USD ($) employees | Dec. 31, 2017 USD ($)
PPL Electric [Member] |  |  |
Other - Labor Union Agreements (Numeric) [Abstract] |  |  |
Number Of Employees Displaced | employees | 86 |  |
Separation Benefits | $ | $ 6 |  |
PPL Electric [Member] | PPL Electric Additional Sites [Member] |  |  |
Environmental Matters - Superfund And Other Remediation (Numeric) [Abstract] |  |  |
Environmental site accrual | $ |  | $ 11 | $ 10
PPL Electric Utilities Corp [Member] |  |  |
Other - Labor Union Agreements (Numeric) [Abstract] |  |  |
Number Of Employees Displaced | employees | 86 |  |
Separation Benefits | $ | $ 6 |  |
PPL Electric Utilities Corp [Member] | PPL Electric Additional Sites [Member] |  |  |
Environmental Matters - Superfund And Other Remediation (Numeric) [Abstract] |  |  |
Environmental site accrual | $ |  | $ 11 | $ 10
LG And E And KU Energy LLC [Member] | KU [Member] |  |  |
Other - Labor Union Agreements (Numeric) [Abstract] |  |  |
Number Of Union Employees | employees |  | 68 |
Collective Bargaining Agreement Term |  | 3 years |
Kentucky Utilities Co [Member] |  |  |
Other - Labor Union Agreements (Numeric) [Abstract] |  |  |
Number Of Union Employees | employees |  | 68 |
Collective Bargaining Agreement Term |  | 3 years |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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