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Segment and Related Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Integer
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Income Statement Data [Abstract]      
Operating Revenues from external customers $ 2,126 $ 1,951  
Net Income 452 403  
Balance Sheet Data [Abstract]      
Assets 42,388   $ 41,479
PPL Electric Utilities Corp [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 639 573  
Net Income [1] 148 79  
Balance Sheet Data [Abstract]      
Assets $ 10,343   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 $ 872 809  
Net Income [2] 142 103  
Balance Sheet Data [Abstract]      
Assets $ 14,834   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 $ 419 391  
Net Income [1] 72 54  
Balance Sheet Data [Abstract]      
Assets $ 6,587   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 $ 471 437  
Net Income [2] 87 63  
Balance Sheet Data [Abstract]      
Assets $ 8,276   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 $ 615 568  
Net Income 197 286  
Balance Sheet Data [Abstract]      
Assets 17,444   16,813
Segment (Numeric) [Abstract]      
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation 12,900   12,500
Kentucky Regulated [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 872 809  
Net Income 133 95  
Balance Sheet Data [Abstract]      
Assets 14,500   14,468
Kentucky Regulated [Member] | LG And E And KU Energy LLC [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 872    
Pennsylvania Regulated [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 639 573  
Net Income 148 79  
Balance Sheet Data [Abstract]      
Assets 10,356   10,082
Pennsylvania Regulated [Member] | PPL Electric Utilities Corp [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 639    
Corporate And Other [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 0 1  
Net Income (26) $ (57)  
Balance Sheet Data [Abstract]      
Assets $ 88   $ 116
[1] Net income equals comprehensive income.
[2] Net income approximates comprehensive income.