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Derivative Instruments and Hedging Activities - Risk Disclosures (Details)
$ in Millions, £ in Billions
1 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2016
USD ($)
May 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2016
GBP (£)
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]          
Repayment of senior notes   $ 460      
Cash Flow Hedges [Member] | Cross Currency Interest Rate Swap Contracts [Member]          
Interest Rate Risk And Foreign Currency Risk [Line Items]          
Notional amount     $ 802    
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]          
Earliest maturity date of cross-currency cash flow hedge contracts     2017    
Latest maturity date of cross-currency cash flow hedge contracts     2028    
Notional amount matured     $ 460    
Gain (loss) recognized in income upon settlement of cross-currency interest rate swap contracts     $ 46    
Cash Flow Hedges [Member] | Interest Rate Swap Contracts [Member]          
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]          
Insignificant or no hedge ineffectiveness associated with interest rate cash flow hedges    
For the three and six months ended June 30, 2016, PPL had an insignificant amount of ineffectiveness associated with interest rate derivatives.
   
No or insignificant after-tax gains (losses) previously recorded in AOCI reclassified to earnings related to interest rate cash flow hedge contracts    
PPL had no cash flow hedges reclassified into earnings associated with discontinued cash flow hedges for the three and six months ended June 30, 2016.
   
No or insignificant unrealized after-tax gains (losses) on interest rate cash flow hedge contracts expected to be reclassified into earnings during next 12 months    
At June 30, 2016, the accumulated net unrecognized after-tax gains (losses) on qualifying derivatives that are expected to be reclassified into earnings during the next 12 months were insignificant.
   
Economic Hedges [Member] | Interest Rate Swap Contracts [Member]          
Interest Rate Risk And Foreign Currency Risk [Line Items]          
Notional amount     $ 179    
Economic Hedges [Member] | Foreign Currency Contracts [Member]          
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]          
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity     $ 2,700   £ 1.7
Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity     July 2016    
Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity     November 2018    
Economic Hedges [Member] | Foreign Currency Contracts [Member] | Subsequent Event [Member]          
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]          
Cash received on hedge settlement $ 310        
Economic Hedges [Member] | Foreign Currency Contracts [Member] | 2017 And 2018 Hedges [Member]          
Interest Rate Risk And Foreign Currency Risk [Line Items]          
Notional amount     $ 2,000   £ 1.3
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]          
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity     $ 296    
Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity     January 2017    
Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity     November 2018    
Net Investment Hedges [Member] | Combined Foreign Currency Contracts And Intercompany Loans [Member]          
Foreign Currency Risk - Net Investment Hedges (Numeric) [Abstract]          
Net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of AOCI     $ 22 $ 19  
LG And E And KU Energy LLC [Member] | Economic Hedges [Member] | Interest Rate Swap Contracts [Member]          
Interest Rate Risk And Foreign Currency Risk [Line Items]          
Notional amount     179    
Louisville Gas And Electric Co [Member] | Economic Hedges [Member] | Interest Rate Swap Contracts [Member]          
Interest Rate Risk And Foreign Currency Risk [Line Items]          
Notional amount     $ 179    
Interest Rate Risk - Economic Activity (Numeric) [Abstract]          
Year of expiration of the maximum maturity date of interest rate economic activity contracts     2033