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Fair Value Measurements (Financial Instruments Not Recorded at Fair Value) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | $ 23,127 | $ 21,893
Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 28,765 | 25,481
PPL Electric Utilities Corp [Member] | Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 4,236 | 3,985
PPL Electric Utilities Corp [Member] | Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 5,338 | 4,589
LG And E And KU Energy LLC [Member] | Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 6,074 | 6,002
LG And E And KU Energy LLC [Member] | Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 7,589 | 6,766
Louisville Gas And Electric Co [Member] | Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 2,007 | 2,005
Louisville Gas And Electric Co [Member] | Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 2,499 | 2,278
Kentucky Utilities Co [Member] | Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | 2,618 | 2,623
Kentucky Utilities Co [Member] | Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long-term debt | $ 3,334 | $ 3,003

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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=121572278&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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