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Derivative Instruments and Hedging Activities (Risk Disclosures) (Details)
$ in Millions, £ in Billions
1 Months Ended 12 Months Ended
Jul. 31, 2016
USD ($)
May 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
GBP (£)
Sep. 30, 2015
USD ($)
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]              
Repayment Of Senior Debt Related To Matured Cash Flow Hedge   $ 460          
Interest Rate Risk - Economic Activity (Numeric) [Abstract]              
Notional amount of terminated swaps     $ 32        
Net cash settlements on terminated interest rate swaps     $ 9 $ 101 $ 0    
Interest Rate Swaps [Member] | First Mortgage Bonds [Member]              
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]              
Principal amount             $ 1,050
Cash Flow Hedges [Member]              
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]              
Insignificant or no hedge ineffectiveness associated with interest rate cash flow hedges     For 2016, 2015 and 2014, hedge ineffectiveness associated with interest rate derivatives was insignificant.        
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 in 2016 and an insignificant amount in 2014.        
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net     $ 53        
Cash Flow Hedges [Member] | Cross Currency Interest Rate Swaps [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        
Derivative, Notional Amount Matured   $ 460          
Gain (loss) recognized in income upon settlement of cross-currency interest rate swap contracts     $ 46        
Economic Hedges [Member] | Interest Rate Swaps [Member]              
Interest Rate Risk And Foreign Currency Risk [Line Items]              
Notional amount     $ 147        
Interest Rate Risk - Economic Activity (Numeric) [Abstract]              
Year of expiration of the maximum maturity date of interest rate economic activity contracts     2033        
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     $ 2,600     £ 1.9  
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     December 2018        
Economic Hedges [Member] | Foreign Currency Contracts [Member] | Hedges 2017 and 2018 [Member]              
Interest Rate Risk And Foreign Currency Risk [Line Items]              
Notional amount     $ 2,000     £ 1.3  
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]              
Derivative Cash Received On Hedge $ 310            
Net Investment Hedges [Member] | Foreign Currency Contracts [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     21 19      
LG And E And KU Energy LLC [Member]              
Interest Rate Risk - Economic Activity (Numeric) [Abstract]              
Notional amount of terminated swaps     32        
Net cash settlements on terminated interest rate swaps     9 88 0    
LG And E And KU Energy LLC [Member] | Interest Rate Swaps [Member] | First Mortgage Bonds [Member]              
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]              
Principal amount             1,050
LG And E And KU Energy LLC [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member]              
Interest Rate Risk And Foreign Currency Risk [Line Items]              
Notional amount     $ 147        
Interest Rate Risk - Economic Activity (Numeric) [Abstract]              
Year of expiration of the maximum maturity date of interest rate economic activity contracts     2033        
Louisville Gas And Electric Co [Member]              
Interest Rate Risk - Economic Activity (Numeric) [Abstract]              
Notional amount of terminated swaps     $ 32        
Net cash settlements on terminated interest rate swaps     9 44 0    
Louisville Gas And Electric Co [Member] | Interest Rate Swaps [Member] | First Mortgage Bonds [Member]              
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]              
Principal amount             550
Louisville Gas And Electric Co [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member]              
Interest Rate Risk And Foreign Currency Risk [Line Items]              
Notional amount     $ 147        
Interest Rate Risk - Economic Activity (Numeric) [Abstract]              
Year of expiration of the maximum maturity date of interest rate economic activity contracts     2033        
Kentucky Utilities Co [Member]              
Interest Rate Risk - Economic Activity (Numeric) [Abstract]              
Net cash settlements on terminated interest rate swaps     $ 0 $ 44 $ 0    
Kentucky Utilities Co [Member] | Interest Rate Swaps [Member] | First Mortgage Bonds [Member]              
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]              
Principal amount             $ 500