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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense $ 45 $ 50 $ 49
Operating leases, future minimum rental payments due (Details) [Abstract]      
2018 32    
2019 19    
2020 13    
2021 10    
2022 8    
Thereafter 22    
Total 104    
LG And E And KU Energy LLC [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 26 26 24
Operating leases, future minimum rental payments due (Details) [Abstract]      
2018 26    
2019 16    
2020 11    
2021 8    
2022 6    
Thereafter 15    
Total 82    
Louisville Gas And Electric Co [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 15 15 12
Operating leases, future minimum rental payments due (Details) [Abstract]      
2018 15    
2019 8    
2020 5    
2021 3    
2022 2    
Thereafter 6    
Total 39    
Kentucky Utilities Co [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 11 $ 11 $ 11
Operating leases, future minimum rental payments due (Details) [Abstract]      
2018 10    
2019 8    
2020 6    
2021 5    
2022 4    
Thereafter 8    
Total $ 41