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Leases (Detail) - PPL Energy Supply LLC [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Rent - Operating Leases (Details) [Abstract]      
Operating leases, rent expense $ 29 $ 55 $ 62
Operating leases, future minimum rental payments due (Details) [Abstract]      
2015 11    
2016 11    
2017 10    
2018 4    
2019 1    
Thereafter 2    
Total $ 39