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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense $ 50 $ 49 $ 51
Operating leases, future minimum rental payments due (Details) [Abstract]      
2017 31    
2018 26    
2019 16    
2020 11    
2021 8    
Thereafter 26    
Total 118    
LG And E And KU Energy LLC [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 26 24 18
Operating leases, future minimum rental payments due (Details) [Abstract]      
2017 24    
2018 22    
2019 13    
2020 9    
2021 6    
Thereafter 19    
Total 93    
Louisville Gas And Electric Co [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 15 12 7
Operating leases, future minimum rental payments due (Details) [Abstract]      
2017 15    
2018 14    
2019 7    
2020 4    
2021 2    
Thereafter 8    
Total 50    
Kentucky Utilities Co [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 11 $ 11 $ 10
Operating leases, future minimum rental payments due (Details) [Abstract]      
2017 9    
2018 8    
2019 6    
2020 5    
2021 4    
Thereafter 10    
Total $ 42