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Retirement and Postemployment Benefits (Savings Plans and Employee Stock Ownership Plan) (Details) - Deferred Savings Plans 401K [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Contribution Pension And Other Postretirement Plans [Line Items] |  |  |
Employer contributions to deferred savings plans | $ 42 | $ 40 | $ 36
PPL Electric Utilities Corp [Member] |  |  |
Defined Contribution Pension And Other Postretirement Plans [Line Items] |  |  |
Employer contributions to deferred savings plans | 6 | 6 | 6
LG And E And KU Energy LLC [Member] |  |  |
Defined Contribution Pension And Other Postretirement Plans [Line Items] |  |  |
Employer contributions to deferred savings plans | 21 | 20 | 18
Louisville Gas And Electric Co [Member] |  |  |
Defined Contribution Pension And Other Postretirement Plans [Line Items] |  |  |
Employer contributions to deferred savings plans | 6 | 6 | 5
Kentucky Utilities Co [Member] |  |  |
Defined Contribution Pension And Other Postretirement Plans [Line Items] |  |  |
Employer contributions to deferred savings plans | $ 5 | $ 5 | $ 4

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- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
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