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Segment and Related Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Integer
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Income Statement Data [Abstract]      
Operating Revenues from external customers $ 2,054 $ 2,079  
Net Income 554 466  
Balance Sheet Data [Abstract]      
Assets 46,328   $ 45,680
Segment (Numeric) [Abstract]      
Goodwill 3,178   3,198
U.K. Regulated [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 614 583  
Net Income 340 264  
Balance Sheet Data [Abstract]      
Assets 17,918   17,622
Segment (Numeric) [Abstract]      
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation 13,300   13,200
Goodwill 2,500   2,500
Kentucky Regulated [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 825 845  
Net Income 127 117  
Balance Sheet Data [Abstract]      
Assets 15,608   15,597
Pennsylvania Regulated [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 608 645  
Net Income 118 121  
Balance Sheet Data [Abstract]      
Assets 11,898   11,918
Corporate and Other [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 7 6  
Net Income (31) (36)  
Balance Sheet Data [Abstract]      
Assets 904   543
PPL Electric Utilities Corp [Member]      
Income Statement Data [Abstract]      
Operating Revenues from external customers 608 645  
Net Income [1] 118 121  
Balance Sheet Data [Abstract]      
Assets $ 11,882   11,901
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 $ 825 845  
Net Income [2] 135 124  
Balance Sheet Data [Abstract]      
Assets 15,942   15,931
Segment (Numeric) [Abstract]      
Goodwill $ 996   996
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 $ 407 410  
Net Income [3] 73 64  
Balance Sheet Data [Abstract]      
Assets 7,125   7,133
Segment (Numeric) [Abstract]      
Goodwill $ 389   389
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 $ 432 450  
Net Income [4] 80 $ 81  
Balance Sheet Data [Abstract]      
Assets 8,907   8,825
Segment (Numeric) [Abstract]      
Goodwill $ 607   $ 607
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.