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Derivative Instruments and Hedging Activities (Risk Disclosures) (Details)
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Jun. 30, 2011
Cash Flow Hedges [Member]
USD ($)
Dec. 31, 2013
Cash Flow Hedges [Member]
USD ($)
Dec. 31, 2012
Cash Flow Hedges [Member]
Dec. 31, 2011
Cash Flow Hedges [Member]
USD ($)
Dec. 31, 2013
Cash Flow Hedges [Member]
Interest Rate Swap Contracts [Member]
USD ($)
Dec. 31, 2013
Cash Flow Hedges [Member]
Cross Currency Interest Rate Swaps [Member]
USD ($)
Jul. 31, 2012
Fair Value Hedges [Member]
USD ($)
Dec. 31, 2013
Fair Value Hedges [Member]
Dec. 31, 2012
Fair Value Hedges [Member]
Dec. 31, 2011
Fair Value Hedges [Member]
USD ($)
Dec. 31, 2013
Economic Hedges [Member]
Interest Rate Swap Contracts [Member]
USD ($)
Dec. 31, 2013
Economic Hedges [Member]
Foreign Currency Contracts [Member]
USD ($)
Dec. 31, 2013
Economic Hedges [Member]
Foreign Currency Contracts [Member]
GBP (£)
Dec. 31, 2011
Economic Hedges [Member]
Foreign Currency Contracts [Member]
USD ($)
Dec. 31, 2013
Net Investment Hedges [Member]
Foreign Currency Contracts [Member]
USD ($)
Dec. 31, 2013
Net Investment Hedges [Member]
Foreign Currency Contracts [Member]
GBP (£)
Dec. 31, 2012
Net Investment Hedges [Member]
Foreign Currency Contracts [Member]
USD ($)
Dec. 31, 2013
Net Investment Hedges [Member]
Intercompany Loans [Member]
USD ($)
Dec. 31, 2013
Net Investment Hedges [Member]
Intercompany Loans [Member]
GBP (£)
Nov. 30, 2013
KU [Member]
Cash Flow Hedges [Member]
Interest Rate Swap Contracts [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
USD ($)
Dec. 31, 2011
LG And E And KU Energy LLC [Member]
USD ($)
Nov. 30, 2013
LG And E And KU Energy LLC [Member]
Cash Flow Hedges [Member]
Interest Rate Swap Contracts [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Economic Hedges [Member]
Interest Rate Swap Contracts [Member]
USD ($)
Dec. 31, 2013
Louisville Gas And Electric Co [Member]
USD ($)
Dec. 31, 2012
Louisville Gas And Electric Co [Member]
USD ($)
Dec. 31, 2011
Louisville Gas And Electric Co [Member]
USD ($)
Nov. 30, 2013
Louisville Gas And Electric Co [Member]
Cash Flow Hedges [Member]
Interest Rate Swap Contracts [Member]
USD ($)
Dec. 31, 2013
Louisville Gas And Electric Co [Member]
Economic Hedges [Member]
Interest Rate Swap Contracts [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
USD ($)
Dec. 31, 2012
Kentucky Utilities Co [Member]
USD ($)
Dec. 31, 2011
Kentucky Utilities Co [Member]
USD ($)
Interest Rate Risk and Foreign Currency Risk [Line Items]                                                                  
Notional amount         $ 1,300,000,000 $ 1,300,000,000 $ 99,000,000       $ 179,000,000       $ 477,000,000 £ 301,000,000                 $ 179,000,000         $ 179,000,000      
Notional amount of nonderivative instruments                                   69,000,000 42,000,000                            
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]                                                                  
Year of expiration of the maximum maturity date of interest rate cash flow hedge contracts         2044                                                        
Latest maturity date of cross-currency cash flow hedge contracts           2028                                                      
Insignificant or no hedge ineffectiveness associated with interest rate cash flow hedges   insignificant insignificant                                                            
Hedge ineffectiveness associated with interest rate cash flow hedges (4,000,000)     (9,000,000)                                                          
No or insignificant after-tax gains (losses) previously recorded in AOCI reclassified to earnings related to interest rate cash flow hedge contracts   no such reclassifications no such reclassifications no such reclassifications                                                          
Net unrealized after-tax gains (losses) on interest rate cash flow hedge contracts expected to be reclassified into earnings during next 12 months   (10,000,000)                                                              
Principal amount of debt related to interest rate swap that is receiving regulatory accounting treatment                                       250,000,000       500,000,000         250,000,000        
Cash settlement on terminated swaps                                         86,000,000           43,000,000           43,000,000      
Interest Rate Risk - Fair Value Hedges (Numeric) [Abstract]                                                                  
Year of expiration of the maximum maturity date of interest rate fair value hedge contracts             2047                                                    
No or insignificant hedge ineffectiveness associated with interest rate fair value hedges               did not recognize did not recognize did not recognize                                              
No or insignificant gains (losses) associated with interest rate fair value hedges being excluded from the assessment of hedge effectiveness               did not recognize did not recognize did not recognize                                              
No or insignificant gain (loss) associated with interest rate fair value hedges of debt issuances that no longer qualified as interest rate fair value hedges               did not recognize did not recognize did not recognize                                              
Principal amount of debt related to discontinuance of fair value hedge                   400,000,000                                              
Gain (loss) resulting from firm commitments no longer qualifying as interest rate fair value hedges, pre-tax                   22,000,000                                              
Gain (loss) resulting from firm commitments that no longer qualified as interest rate fair value hedges, after-tax                   14,000,000                                              
Interest Rate Risk - Economic Activity (Numeric) [Abstract]                                                                  
Year of expiration of the maximum maturity date of interest rate economic activity contracts                     2033                           2033         2033      
Foreign Currency Risk - Net Investment Hedges (Numeric) [Abstract]                                                                  
Earliest settlement date of net investment hedge contracts                             May 2014 May 2014                                  
Latest settlement date of net investment hedge contracts                             December 2015 December 2015                                  
Insignificant or no net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of AOCI                             insignificant insignificant                                  
Net after tax gains (losses) on net investment hedges included in the foreign currency translation adjustment component of AOCI                                 14,000,000                                
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]                                                                  
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity                       2,300,000,000 1,400,000,000                                        
Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity                       January 2014 January 2014                                        
Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity                       December 2015 December 2015                                        
Gains (losses) on foreign currency contracts related to debt or commitments hedged with foreign currency contracts classified as economic activity                           $ 55,000,000