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Fair Value Measurements (Financial Instruments Not Recorded at Fair Value) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | $ 20,599 | $ 20,195
Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 22,939 | 23,783
PPL Electric Utilities Corp [Member] | Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 3,694 | 3,298
PPL Electric Utilities Corp [Member] | Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 3,901 | 3,769
LG And E And KU Energy LLC [Member] | Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 5,502 | 5,159
LG And E And KU Energy LLC [Member] | Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 5,768 | 5,670
Louisville Gas And Electric Co [Member] | Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 1,809 | 1,709
Louisville Gas And Electric Co [Member] | Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 1,874 | 1,865
Kentucky Utilities Co [Member] | Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 2,321 | 2,328
Kentucky Utilities Co [Member] | Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | $ 2,451 | $ 2,605

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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