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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
PPL Energy Supply LLC [Member]
PPL Electric [Member]
Jun. 30, 2014
PPL Energy Supply LLC [Member]
Services Company Affiliate [Member]
Jun. 30, 2013
PPL Energy Supply LLC [Member]
Services Company Affiliate [Member]
Jun. 30, 2014
PPL Energy Supply LLC [Member]
Services Company Affiliate [Member]
Jun. 30, 2013
PPL Energy Supply LLC [Member]
Services Company Affiliate [Member]
Jun. 30, 2014
PPL Electric Utilities Corp [Member]
Dec. 31, 2013
PPL Electric Utilities Corp [Member]
Jun. 30, 2014
PPL Electric Utilities Corp [Member]
Services Company Affiliate [Member]
Jun. 30, 2013
PPL Electric Utilities Corp [Member]
Services Company Affiliate [Member]
Jun. 30, 2014
PPL Electric Utilities Corp [Member]
Services Company Affiliate [Member]
Jun. 30, 2013
PPL Electric Utilities Corp [Member]
Services Company Affiliate [Member]
Dec. 31, 2013
PPL Electric Utilities Corp [Member]
PPL Energy Funding [Member]
Jun. 30, 2014
LG And E And KU Energy LLC [Member]
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Jun. 30, 2014
LG And E And KU Energy LLC [Member]
Services Company Affiliate [Member]
Jun. 30, 2013
LG And E And KU Energy LLC [Member]
Services Company Affiliate [Member]
Jun. 30, 2014
LG And E And KU Energy LLC [Member]
Services Company Affiliate [Member]
Jun. 30, 2013
LG And E And KU Energy LLC [Member]
Services Company Affiliate [Member]
Jun. 30, 2014
LG And E And KU Energy LLC [Member]
PPL Energy Funding [Member]
Jun. 30, 2014
LG And E And KU Energy LLC [Member]
PPL Affiliate [Member]
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
PPL Affiliate [Member]
Jun. 30, 2014
Louisville Gas And Electric Co [Member]
Services Company Affiliate [Member]
Jun. 30, 2013
Louisville Gas And Electric Co [Member]
Services Company Affiliate [Member]
Jun. 30, 2014
Louisville Gas And Electric Co [Member]
Services Company Affiliate [Member]
Jun. 30, 2013
Louisville Gas And Electric Co [Member]
Services Company Affiliate [Member]
Jun. 30, 2014
Kentucky Utilities Co [Member]
Services Company Affiliate [Member]
Jun. 30, 2013
Kentucky Utilities Co [Member]
Services Company Affiliate [Member]
Jun. 30, 2014
Kentucky Utilities Co [Member]
Services Company Affiliate [Member]
Jun. 30, 2013
Kentucky Utilities Co [Member]
Services Company Affiliate [Member]
PLR Contracts/Purchase of Accounts Receivable (Numeric) [Abstract]                                                          
Credit exposure with affiliate under a Master Supply Agreement $ 24                                                        
Support Costs (Details) [Abstract]                                                          
Support cost allocations from subsidiary of parent to registrant   54 52 112 109     38 34 79 72       4 4 8 8                      
Intercompany Billings by LKS (Details) [Abstract]                                                          
Intercompany billings between affiliates                                           57 67 105 106 59 44 112 110
Intercompany Borrowings (Numeric) [Abstract]                                                          
Notes receivable from affiliates              150           16 70                              
Intercompany borrowings demand note rate on outstanding borrowing                       1.92%               2.15% 2.17%                
Intercompany note with affiliate maximum borrowing capacity                                     $ 225 $ 300