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Segment and Related Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Integer
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Income Statement Data [Abstract]          
Operating Revenues from external customers $ 1,848 $ 1,725 $ 3,974 $ 3,676  
Net Income 515 292 967 695  
Balance Sheet Data [Abstract]          
Assets 42,830   42,830   $ 41,479
PPL Electric Utilities Corp [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 517 500 1,156 1,073  
Net Income [1] 75 77 223 156  
Balance Sheet Data [Abstract]          
Assets 10,983   $ 10,983   10,082
Segment (Numeric) [Abstract]          
Number of Reportable Segments | Integer     1    
Number of Operating Segments | Integer     2    
LG And E And KU Energy LLC [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 743 723 $ 1,615 1,532  
Net Income 86 87 228 [2] 190 [2]  
Balance Sheet Data [Abstract]          
Assets 14,970   $ 14,970   14,802
Segment (Numeric) [Abstract]          
Number of Reportable Segments | Integer     1    
Number of Operating Segments | Integer     1    
Louisville Gas And Electric Co [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 335 324 $ 754 715  
Net Income [1] 50 42 122 96  
Balance Sheet Data [Abstract]          
Assets 6,649   $ 6,649   6,559
Segment (Numeric) [Abstract]          
Number of Reportable Segments | Integer     1    
Number of Operating Segments | Integer     1    
Kentucky Utilities Co [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 414 406 $ 885 843  
Net Income [2] 61 56 148 119  
Balance Sheet Data [Abstract]          
Assets 8,353   $ 8,353   8,254
Segment (Numeric) [Abstract]          
Number of Reportable Segments | Integer     1    
Number of Operating Segments | Integer     1    
United Kingdom Regulated [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 584 502 $ 1,199 1,070  
Net Income 394 148 591 434  
Balance Sheet Data [Abstract]          
Assets 16,839   16,839   16,813
Segment (Numeric) [Abstract]          
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation 12,600   12,600   12,500
Kentucky Regulated [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 743 723 1,615 1,532  
Net Income 77 79 210 174  
Balance Sheet Data [Abstract]          
Assets 14,636   14,636   14,468
Pennsylvania Regulated [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 517 500 1,156 1,073  
Net Income 75 77 223 156  
Balance Sheet Data [Abstract]          
Assets 10,995   10,995   10,082
Corporate and Other [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 4 0 4 1  
Net Income (31) $ (12) (57) $ (69)  
Balance Sheet Data [Abstract]          
Assets $ 360   $ 360   $ 116
[1] Net income equals comprehensive income.
[2] Net income approximates comprehensive income.