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Segment and Related Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Integer
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Income Statement Data [Abstract]          
Revenues from external customers $ 1,725 $ 1,785 $ 3,676 $ 3,796  
Net Income 292 483 695 964  
Balance Sheet Data [Abstract]          
Assets 39,964   39,964   $ 38,315
PPL Electric Utilities Corp [Member]          
Income Statement Data [Abstract]          
Revenues from external customers 500 495 1,073 1,080  
Net Income [1] 77 79 156 173  
Balance Sheet Data [Abstract]          
Assets 10,175   $ 10,175   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 723 721 $ 1,532 1,547  
Net Income 87 84 190 204  
Balance Sheet Data [Abstract]          
Assets 14,377   $ 14,377   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 324 323 $ 715 709  
Net Income [1] 42 40 96 96  
Balance Sheet Data [Abstract]          
Assets 6,294   $ 6,294   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 406 407 $ 843 860  
Net Income [2] 56 54 119 129  
Balance Sheet Data [Abstract]          
Assets 8,086   $ 8,086   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 502 563 $ 1,070 1,158  
Net Income 148 345 434 634  
Balance Sheet Data [Abstract]          
Assets 15,798   15,798   14,537
Segment (Numeric) [Abstract]          
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation 11,500   11,500   10,800
Kentucky Regulated [Member]          
Income Statement Data [Abstract]          
Revenues from external customers 723 721 1,532 1,547  
Net Income 79 76 174 188  
Balance Sheet Data [Abstract]          
Assets 14,043   14,043   14,037
Pennsylvania Regulated [Member]          
Income Statement Data [Abstract]          
Revenues from external customers 500 495 1,073 1,080  
Net Income 77 78 156 172  
Balance Sheet Data [Abstract]          
Assets 10,175   10,175   9,426
Corporate And Other [Member]          
Income Statement Data [Abstract]          
Revenues from external customers 0 6 1 11  
Net Income (12) $ (16) (69) $ (30)  
Balance Sheet Data [Abstract]          
Assets $ (52)   $ (52)   $ 315
[1] Net income equals comprehensive income.
[2] Net income approximates comprehensive income.