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Income and Other Taxes (Unrecognized to End) (Details)
$ in Millions
12 Months Ended
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