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Segment and Related Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Integer
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Income Statement Data [Abstract]          
Operating Revenues from external customers $ 1,803 $ 1,848 $ 3,882 $ 3,974  
Net Income 441 515 907 967  
Balance Sheet Data [Abstract]          
Assets 44,204   44,204   $ 43,396
U.K. Regulated [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 541 584 1,124 1,199  
Net Income 284 394 548 591  
Balance Sheet Data [Abstract]          
Assets 17,134   17,134   16,700
Segment (Numeric) [Abstract]          
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation 12,600   12,600   12,400
Kentucky Regulated [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 732 743 1,577 1,615  
Net Income 97 77 214 210  
Balance Sheet Data [Abstract]          
Assets 15,296   15,296   15,078
Pennsylvania Regulated [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 521 517 1,166 1,156  
Net Income 94 75 215 223  
Balance Sheet Data [Abstract]          
Assets 11,371   11,371   11,257
Corporate and Other [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 9 4 15 4  
Net Income (34) (31) (70) (57)  
Balance Sheet Data [Abstract]          
Assets 403   403   361
PPL Electric Utilities Corp [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 521 517 1,166 1,156  
Net Income [1] 94 75 215 223  
Balance Sheet Data [Abstract]          
Assets 11,354   $ 11,354   11,243
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 732 743 $ 1,577 1,615  
Net Income [2] 106 86 230 228  
Balance Sheet Data [Abstract]          
Assets 15,630   $ 15,630   15,412
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 334 335 $ 744 754  
Net Income 44 [1] 50 [1] 108 [3] 122 [3]  
Balance Sheet Data [Abstract]          
Assets 6,939   $ 6,939   6,883
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 406 414 $ 856 885  
Net Income [4] 61 $ 61 142 $ 148  
Balance Sheet Data [Abstract]          
Assets $ 8,691   $ 8,691   $ 8,540
Segment (Numeric) [Abstract]          
Number of Reportable Segments | Integer     1    
Number of Operating Segments | Integer     1    
[1]
Net income equals comprehensive income.

[2]
Net income approximates comprehensive income.

[3]
Net income equals comprehensive income.
[4]
Net income equals comprehensive income.