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Commitments and Contingencies (Environmental Matter and Other) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) employees
Other - Labor Union Agreements (Numeric) [Abstract] |
Collective Bargaining Agreement Term | 5 years
PPL Electric [Member] | PPL Electric Additional Sites [Member] |
Environmental Matters - Superfund And Other Remediation (Numeric) [Abstract] |
Environmental site accrual | $ | $ 10
PPL Electric Utilities Corp [Member] |
Other - Labor Union Agreements (Numeric) [Abstract] |
Number Of Union Employees | 1,400
Collective Bargaining Agreement Term | 5 years
PPL Electric Utilities Corp [Member] | PPL Electric Additional Sites [Member] |
Environmental Matters - Superfund And Other Remediation (Numeric) [Abstract] |
Environmental site accrual | $ | $ 10
LG And E And KU Energy LLC [Member] | LGE [Member] |
Other - Labor Union Agreements (Numeric) [Abstract] |
Number Of Union Employees | 671
Collective Bargaining Agreement Term | 3 years
LG And E And KU Energy LLC [Member] | KU [Member] |
Other - Labor Union Agreements (Numeric) [Abstract] |
Number Of Union Employees | 54
Collective Bargaining Agreement Term | 3 years
Louisville Gas And Electric Co [Member] |
Other - Labor Union Agreements (Numeric) [Abstract] |
Number Of Union Employees | 671
Collective Bargaining Agreement Term | 3 years
Kentucky Utilities Co [Member] |
Other - Labor Union Agreements (Numeric) [Abstract] |
Number Of Union Employees | 54
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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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