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Fair Value Measurements - Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Carrying Amount [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | $ 21,840 | $ 21,893
Fair Value [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 25,175 | 25,481
PPL Electric Utilities Corp [Member] | Carrying Amount [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 3,986 | 3,985
PPL Electric Utilities Corp [Member] | Fair Value [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 4,500 | 4,589
LG And E And KU Energy LLC [Member] | Carrying Amount [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 6,003 | 6,002
LG And E And KU Energy LLC [Member] | Fair Value [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 6,774 | 6,766
Louisville Gas And Electric Co [Member] | Carrying Amount [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 2,005 | 2,005
Louisville Gas And Electric Co [Member] | Fair Value [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 2,254 | 2,278
Kentucky Utilities Co [Member] | Carrying Amount [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 2,624 | 2,623
Kentucky Utilities Co [Member] | Fair Value [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | $ 2,978 | $ 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=118260190&loc=d3e13433-108611 + Details
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