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Available-for-Sale Securities (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost - maturity less than 1 year $ 10        
Amortized cost - maturity between 1 and 5 years 82        
Amortized cost - maturity between 6 and 10 years 75        
Amortized cost - maturity in excess of 10 years 65        
Amortized cost total 232        
Fair value - maturity less than 1 year 10        
Fair value - maturity between 1 and 5 years 84        
Fair value - maturity between 6 and 10 years 76        
Fair value - maturity in excess of 10 years 68        
Fair value total 238        
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]          
Proceeds from sales of NDT securities [1] 100 $ 65      
Other proceeds from sales   3      
Gross realized gains [2] 13 8      
Gross realized losses [2] 9 $ 4      
NDT Funds          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost 532   $ 522    
Gross unrealized gains 427   428    
Gross unrealized losses 1   0    
Fair value 958   950    
NDT Funds | Cash and cash equivalents          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost 15   19    
Gross unrealized gains 0   0    
Gross unrealized losses 0   0    
Fair value 15   19    
NDT Funds | Equity securities          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost 292   283    
Gross unrealized gains 420   417    
Gross unrealized losses 0   0    
Fair value 712   700    
NDT Funds | Debt securities          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost 225   218    
Gross unrealized gains 7   11    
Gross unrealized losses 1   0    
Fair value 231   229    
NDT Funds | Receivables/payables, net          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost 0   2    
Gross unrealized gains 0   0    
Gross unrealized losses 0   0    
Fair value 0   2    
Auction Rate Securities          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost 7   8    
Gross unrealized gains 0   0    
Gross unrealized losses 0   0    
Fair value $ 7   8    
PPL Energy Supply LLC [Member]          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost - maturity less than 1 year     10    
Amortized cost - maturity between 1 and 5 years     87    
Amortized cost - maturity between 6 and 10 years     64    
Amortized cost - maturity in excess of 10 years     65    
Amortized cost total     226    
Fair value - maturity less than 1 year     10    
Fair value - maturity between 1 and 5 years     89    
Fair value - maturity between 6 and 10 years     67    
Fair value - maturity in excess of 10 years     71    
Fair value total     237    
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]          
Proceeds from sales of NDT securities     154 $ 144 $ 139
Other proceeds from sales     9   3
Gross realized gains [2]     23 17 29
Gross realized losses [2]     10 7 $ 21
PPL Energy Supply LLC [Member] | NDT Funds          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost     522 497  
Gross unrealized gains     428 370  
Gross unrealized losses       3  
Fair value     $ 950 864  
Percentage of shortfall PPL Susquehanna would be obligated to fund     90.00%    
PPL Energy Supply LLC [Member] | NDT Funds | Cash and cash equivalents          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost     $ 19 14  
Gross unrealized gains     0 0  
Gross unrealized losses     0 0  
Fair value     19 14  
PPL Energy Supply LLC [Member] | NDT Funds | Equity securities          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost     283 265  
Gross unrealized gains     417 363  
Fair value     700 628  
PPL Energy Supply LLC [Member] | NDT Funds | Debt securities          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost     218 217  
Gross unrealized gains     11 7  
Gross unrealized losses       3  
Fair value     229 221  
PPL Energy Supply LLC [Member] | NDT Funds | Receivables/payables, net          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost     2 1  
Fair value     2 1  
PPL Energy Supply LLC [Member] | Auction Rate Securities          
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract]          
Amortized cost     8 17  
Gross unrealized losses       1  
Fair value     $ 8 $ 16  
[1] These proceeds are used to pay income taxes and fees related to managing the trust. Remaining proceeds are reinvested in the trust.
[2] Excludes the impact of other-than-temporary impairment charges recognized on the Statements of Income.