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Segment and Related Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Integer
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Income Statement Data [Abstract]      
Revenues from external customers $ 1,951 $ 2,011  
Net Income 403 481  
Balance Sheet Data [Abstract]      
Assets 39,034   $ 38,315
PPL Electric Utilities Corp [Member]      
Income Statement Data [Abstract]      
Revenues from external customers 573 585  
Net Income [1] 79 94  
Balance Sheet Data [Abstract]      
Assets $ 9,699   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 $ 809 826  
Net Income [2] 103 120  
Balance Sheet Data [Abstract]      
Assets $ 14,344   14,371
Segment (Numeric) [Abstract]      
Number of Reportable Segments | Integer 1    
Louisville Gas And Electric Co [Member]      
Income Statement Data [Abstract]      
Revenues from external customers $ 391 386  
Net Income [1] 54 56  
Balance Sheet Data [Abstract]      
Assets $ 6,268   6,300
Segment (Numeric) [Abstract]      
Number of Reportable Segments | Integer 1    
Kentucky Utilities Co [Member]      
Income Statement Data [Abstract]      
Revenues from external customers $ 437 453  
Net Income [2] 63 75  
Balance Sheet Data [Abstract]      
Assets $ 8,086   8,085
Segment (Numeric) [Abstract]      
Number of Reportable Segments | Integer 1    
United Kingdom Regulated [Member]      
Income Statement Data [Abstract]      
Revenues from external customers $ 568 595  
Net Income 286 289  
Balance Sheet Data [Abstract]      
Assets 15,039   14,537
Segment (Numeric) [Abstract]      
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation 10,900   10,800
Kentucky Regulated [Member]      
Income Statement Data [Abstract]      
Revenues from external customers 809 826  
Net Income 95 112  
Balance Sheet Data [Abstract]      
Assets 14,010   14,037
Pennsylvania Regulated [Member]      
Income Statement Data [Abstract]      
Revenues from external customers 573 585  
Net Income 79 94  
Balance Sheet Data [Abstract]      
Assets 9,699   9,426
Corporate And Other [Member]      
Income Statement Data [Abstract]      
Revenues from external customers 1 5  
Net Income (57) $ (14)  
Balance Sheet Data [Abstract]      
Assets $ 286   $ 315
[1] Net income equals comprehensive income.
[2] Net income approximates comprehensive income.