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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense $ 49 $ 51 $ 56
Operating leases, future minimum rental payments due (Details) [Abstract]      
2016 33    
2017 28    
2018 24    
2019 14    
2020 11    
Thereafter 31    
Total 141    
LG And E And KU Energy LLC [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 24 18 18
Operating leases, future minimum rental payments due (Details) [Abstract]      
2016 25    
2017 23    
2018 21    
2019 12    
2020 9    
Thereafter 22    
Total 112    
Louisville Gas And Electric Co [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 12 7 7
Operating leases, future minimum rental payments due (Details) [Abstract]      
2016 14    
2017 14    
2018 13    
2019 7    
2020 4    
Thereafter 10    
Total 62    
Kentucky Utilities Co [Member]      
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense 11 $ 10 $ 10
Operating leases, future minimum rental payments due (Details) [Abstract]      
2016 10    
2017 9    
2018 7    
2019 5    
2020 5    
Thereafter 11    
Total $ 47