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Segment and Related Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Integer
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Income Statement Data [Abstract]      
Operating Revenues from external customers $ 2,079 $ 2,126  
Net Income 466 452  
Balance Sheet Data [Abstract]      
Assets 44,567   $ 43,396
Segment (Numeric) [Abstract]      
Goodwill 3,260   3,162
U.K. Regulated [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 583 615  
Net Income 264 197  
Balance Sheet Data [Abstract]      
Assets 17,753   16,700
Segment (Numeric) [Abstract]      
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation 13,100   12,400
Goodwill 2,500   2,400
Kentucky Regulated [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 845 872  
Net Income 117 133  
Balance Sheet Data [Abstract]      
Assets 15,176   15,078
Pennsylvania Regulated [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 645 639  
Net Income 121 148  
Balance Sheet Data [Abstract]      
Assets 11,260   11,257
Corporate and Other [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 6 0  
Net Income (36) (26)  
Balance Sheet Data [Abstract]      
Assets 378   361
PPL Electric Utilities Corp [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 645 639  
Net Income [1] 121 148  
Balance Sheet Data [Abstract]      
Assets $ 11,243   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 $ 845 872  
Net Income [2] 124 142  
Balance Sheet Data [Abstract]      
Assets $ 15,510   15,412
Segment (Numeric) [Abstract]      
Number of Reportable Segments | Integer 1    
Number of Operating Segments | Integer 1    
Goodwill $ 996   996
Louisville Gas And Electric Co [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 410 419  
Net Income [3] 64 72  
Balance Sheet Data [Abstract]      
Assets $ 6,918   6,883
Segment (Numeric) [Abstract]      
Number of Reportable Segments | Integer 1    
Number of Operating Segments | Integer 1    
Goodwill $ 389   389
Kentucky Utilities Co [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 450 471  
Net Income 81 $ 87  
Balance Sheet Data [Abstract]      
Assets $ 8,609   8,540
Segment (Numeric) [Abstract]      
Number of Reportable Segments | Integer 1    
Number of Operating Segments | Integer 1    
Goodwill $ 607   $ 607
[1] Net income equals comprehensive income.
[2] Net income approximates comprehensive income.
[3] Net income equals comprehensive income.