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Segment and Related Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Integer
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Income Statement Data [Abstract]          
Revenues from external customers $ 1,845 $ 1,889 $ 5,521 $ 5,685  
Net Income 355 473 1,050 1,437  
Balance Sheet Data [Abstract]          
Assets 40,758   40,758   $ 38,315
PPL Electric Utilities Corp [Member]          
Income Statement Data [Abstract]          
Revenues from external customers 547 539 1,620 1,619  
Net Income [1] 95 90 251 263  
Balance Sheet Data [Abstract]          
Assets 10,323   $ 10,323   9,426
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]          
Revenues from external customers 818 835 $ 2,350 2,382  
Net Income 132 133 322 337  
Balance Sheet Data [Abstract]          
Assets 14,515   $ 14,515   14,371
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]          
Revenues from external customers 363 368 $ 1,078 1,077  
Net Income [1] 65 63 161 159  
Balance Sheet Data [Abstract]          
Assets 6,390   $ 6,390   6,300
Segment (Numeric) [Abstract]          
Number of Reportable Segments | Integer     1    
Number of Operating Segments | Integer     1    
Kentucky Utilities Co [Member]          
Income Statement Data [Abstract]          
Revenues from external customers 460 474 $ 1,303 1,334  
Net Income [2] 77 78 196 207  
Balance Sheet Data [Abstract]          
Assets 8,146   $ 8,146   8,085
Segment (Numeric) [Abstract]          
Number of Reportable Segments | Integer     1    
Number of Operating Segments | Integer     1    
United Kingdom Regulated [Member]          
Income Statement Data [Abstract]          
Revenues from external customers 477 515 $ 1,547 1,673  
Net Income 126 281 560 915  
Balance Sheet Data [Abstract]          
Assets 16,052   16,052   14,537
Segment (Numeric) [Abstract]          
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation 11,700   11,700   10,800
Kentucky Regulated [Member]          
Income Statement Data [Abstract]          
Revenues from external customers 818 835 2,350 2,382  
Net Income 125 126 299 314  
Balance Sheet Data [Abstract]          
Assets 14,181   14,181   14,037
Pennsylvania Regulated [Member]          
Income Statement Data [Abstract]          
Revenues from external customers 547 539 1,620 1,619  
Net Income 95 91 251 263  
Balance Sheet Data [Abstract]          
Assets 10,323   10,323   9,426
Corporate And Other [Member]          
Income Statement Data [Abstract]          
Revenues from external customers 3 0 4 11  
Net Income 9 $ (25) (60) $ (55)  
Balance Sheet Data [Abstract]          
Assets $ 202   $ 202   $ 315
[1] Net income equals comprehensive income.
[2] Net income approximates comprehensive income.