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Income and Other Taxes (Unrecognized to End) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 Integer | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | 4 |  |
Income Tax Other (Numeric) [Abstract] |  |  |
Benefit recorded related to the settlement of the IRS audit for tax years 1998-2011 | $ |  | $ 3 | $ 24
Benefit recorded in continuing operations related to the settlement of the IRS audit for tax years 1998-2011 | $ |  |  | $ 12
US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2013 and prior |  |
Pennsylvania - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2011 and prior |  |
Kentucky - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2012 and prior |  |
United Kingdom - Foreign [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2014 and prior |  |
PPL Electric Utilities Corp [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | 2 |  |
PPL Electric Utilities Corp [Member] | US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2013 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 | 2011 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 | 2 |  |
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 | 2013 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 | 2012 and prior |  |
Louisville Gas And Electric Co [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | 2 |  |
Louisville Gas And Electric Co [Member] | US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2013 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 | 2012 and prior |  |
Kentucky Utilities Co [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | 2 |  |
Kentucky Utilities Co [Member] | US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2013 and prior |  |
Kentucky Utilities Co [Member] | Kentucky - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2012 and prior |  |

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