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Commitments and Contingencies - Environmental Matters and Other (Details) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2017 employees | Mar. 31, 2017 employees | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Other - Labor Union Agreements (Numeric) [Abstract] |  |  |  |
Collective Bargaining Agreement Term |  | 5 years |  |
Number Of Union Employees |  | 1,400 |  |
PPL Electric Additional Sites [Member] |  |  |  |
Environmental Matters - Superfund and Other Remediation (Numeric) [Abstract] |  |  |  |
Environmental site accrual | $ |  |  | $ 10 | $ 10
PPL Electric Utilities Corp [Member] |  |  |  |
Other - Labor Union Agreements (Numeric) [Abstract] |  |  |  |
Collective Bargaining Agreement Term |  | 5 years |  |
Number Of Union Employees |  | 1,400 |  |
PPL Electric Utilities Corp [Member] | PPL Electric Additional Sites [Member] |  |  |  |
Environmental Matters - Superfund and Other Remediation (Numeric) [Abstract] |  |  |  |
Environmental site accrual | $ |  |  | $ 10 | $ 10
LG And E And KU Energy LLC [Member] | KU [Member] | Subsequent Event [Member] |  |  |  |
Other - Labor Union Agreements (Numeric) [Abstract] |  |  |  |
Collective Bargaining Agreement Term | 3 years |  |  |
Number Of Union Employees | 53 |  |  |
Collective Bargaining Expiration Date | 2020-08 |  |  |
Kentucky Utilities Co [Member] | Subsequent Event [Member] |  |  |  |
Other - Labor Union Agreements (Numeric) [Abstract] |  |  |  |
Collective Bargaining Agreement Term | 3 years |  |  |
Number Of Union Employees | 53 |  |  |
Collective Bargaining Expiration Date | 2020-08 |  |  |

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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=25496072&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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