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Segment and Related Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Integer
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Income Statement Data [Abstract]          
Operating Revenues from external customers $ 1,872 $ 1,845 $ 5,846 $ 5,521  
Net Income 445 355 1,412 1,050  
Balance Sheet Data [Abstract]          
Assets 43,042   43,042   $ 41,479
PPL Electric Utilities Corp [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 548 547 1,704 1,620  
Net Income [1] 111 95 334 251  
Balance Sheet Data [Abstract]          
Assets 11,096   $ 11,096   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 802 818 $ 2,417 2,350  
Net Income 130 132 358 322  
Balance Sheet Data [Abstract]          
Assets 15,088   $ 15,088   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 362 363 $ 1,116 1,078  
Net Income [1] 66 65 188 161  
Balance Sheet Data [Abstract]          
Assets 6,721   $ 6,721   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 447 460 $ 1,332 1,303  
Net Income [2] 77 77 225 196  
Balance Sheet Data [Abstract]          
Assets 8,400   $ 8,400   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 517 477 $ 1,716 1,547  
Net Income 245 126 836 560  
Balance Sheet Data [Abstract]          
Assets 16,823   16,823   16,813
Segment (Numeric) [Abstract]          
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation 12,400   12,400   12,500
Kentucky Regulated [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 802 818 2,417 2,350  
Net Income 122 125 332 299  
Balance Sheet Data [Abstract]          
Assets 14,754   14,754   14,468
Pennsylvania Regulated [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 548 547 1,704 1,620  
Net Income 112 95 335 251  
Balance Sheet Data [Abstract]          
Assets 11,110   11,110   10,082
Corporate and Other [Member]          
Income Statement Data [Abstract]          
Operating Revenues from external customers 5 3 9 4  
Net Income (34) $ 9 (91) $ (60)  
Balance Sheet Data [Abstract]          
Assets $ 355   $ 355   $ 116
[1] Net income equals comprehensive income.
[2] Net income approximates comprehensive income.