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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
shares in Thousands, $ in Millions
Sep. 30, 2015
Dec. 31, 2014
Receivables Net Current [Abstract]    
Accounts receivable reserve for uncollectible accounts $ 46 $ 44
Equity    
Common stock par value $ 0.01 $ 0.01
Common stock shares authorized 780,000 780,000
Common stock shares issued 671,792 665,849
Common stock shares outstanding 671,792 665,849
PPL Electric Utilities Corp [Member]    
Receivables Net Current [Abstract]    
Accounts receivable reserve for uncollectible accounts $ 21 $ 17
Equity    
Common stock no par value
Common stock shares authorized 170,000 170,000
Common stock shares issued 66,368 66,368
Common stock shares outstanding 66,368 66,368
LG And E And KU Energy LLC [Member]    
Receivables Net Current [Abstract]    
Accounts receivable reserve for uncollectible accounts $ 23 $ 25
Louisville Gas And Electric Co [Member]    
Receivables Net Current [Abstract]    
Accounts receivable reserve for uncollectible accounts $ 1 $ 2
Equity    
Common stock no par value
Common stock shares authorized 75,000 75,000
Common stock shares issued 21,294 21,294
Common stock shares outstanding 21,294 21,294
Kentucky Utilities Co [Member]    
Receivables Net Current [Abstract]    
Accounts receivable reserve for uncollectible accounts $ 2 $ 2
Equity    
Common stock no par value
Common stock shares authorized 80,000 80,000
Common stock shares issued 37,818 37,818
Common stock shares outstanding 37,818 37,818