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Income and Other Taxes (Unrecognized to End) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) Integer | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | Integer | 4 |  |
Deferred Income Tax Expense (Benefit) | $ 432 | $ 338 | $ 410
Increase (Decrease) in Regulatory Assets and Liabilities | $ 63 | 88 | (13)
US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2016 and prior |  |
Pennsylvania - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2016 and prior |  |
Kentucky - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2014 and prior |  |
United Kingdom - Foreign [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2016 and prior |  |
PPL Electric Utilities Corp [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | Integer | 2 |  |
Deferred Income Tax Expense (Benefit) | $ 83 | 90 | 133
Increase (Decrease) in Regulatory Assets and Liabilities | $ 40 | 43 | 19
PPL Electric Utilities Corp [Member] | US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2016 and prior |  |
PPL Electric Utilities Corp [Member] | Pennsylvania - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2016 and prior |  |
LG And E And KU Energy LLC [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | Integer | 2 |  |
Deferred Income Tax Expense (Benefit) | $ 67 | 86 | 99
Increase (Decrease) in Regulatory Assets and Liabilities | $ 26 | 45 | (32)
LG And E And KU Energy LLC [Member] | US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2016 and prior |  |
LG And E And KU Energy LLC [Member] | Kentucky - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2014 and prior |  |
Louisville Gas And Electric Co [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | Integer | 2 |  |
Deferred Income Tax Expense (Benefit) | $ 3 | 56 | 61
Increase (Decrease) in Regulatory Assets and Liabilities | $ 0 | 19 | (5)
Louisville Gas And Electric Co [Member] | US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2016 and prior |  |
Louisville Gas And Electric Co [Member] | Kentucky - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2014 and prior |  |
Kentucky Utilities Co [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | Integer | 2 |  |
Deferred Income Tax Expense (Benefit) | $ 22 | 41 | 50
Increase (Decrease) in Regulatory Assets and Liabilities | $ 26 | $ 26 | $ (27)
Kentucky Utilities Co [Member] | US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2016 and prior |  |
Kentucky Utilities Co [Member] | Kentucky - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2014 and prior |  |

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