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Jointly Owned Utility Facilities (Tables)
 12 Months Ended
Dec. 31, 2013
Jointly Owned Facilities [Line Items]  
Jointly Owned Utility Facilities

At December 31, 2013 and 2012, the Balance Sheets reflect the owned interests in the facilities listed below.

                Construction
     Ownership    Other Accumulated Work
     Interest Electric Plant Property Depreciation in Progress
PPL               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
  Trimble County Units 1 & 2  75.00%   1,288      144   54
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
  Trimble County Units 1 & 2  75.00%   1,279      112   43
 Merrill Creek Reservoir  8.37%    $ 22   15   

PPL Energy Supply               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
 Merrill Creek Reservoir  8.37%    $ 22   15   

LKE                
 December 31, 2013               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 308    $ 42 $ 18
  Trimble County Unit 2  75.00%   980      102   36
                  
 December 31, 2012               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 304    $ 33 $ 10
  Trimble County Unit 2  75.00%   975      79   33
                  
LG&E               
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      5   1
  Trimble County Unit 1   75.00%   308      42   18
  Trimble County Unit 2   14.25%   200      19   14
  Trimble County Units 5-6  29.00%   29      3   
  Trimble County Units 7-10  37.00%   69      7   1
  Cane Run Unit 7  22.00%            91
  Green River Unit 5  40.00%            1
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 5   
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      3   
  Trimble County Unit 1   75.00%   304      33 $ 10
  Trimble County Unit 2   14.25%   198      14   13
  Trimble County Units 5-6  29.00%   29      2   
  Trimble County Units 7-10  37.00%   68      6   2
  Cane Run Unit 7  22.00%            16
                  
KU                
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 11 $ 2
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      4   1
  Trimble County Unit 2   60.75%   780      83   22
  Trimble County Units 5-6  71.00%   70      8   
  Trimble County Units 7-10  63.00%   118      12   2
  Cane Run Unit 7  78.00%            317
  Green River Unit 5  60.00%            2
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      2   
  Trimble County Unit 2   60.75%   777      65   20
  Trimble County Units 5-6  71.00%   70      4   
  Trimble County Units 7-10  63.00%   116      10   2
  Cane Run Unit 7  78.00%            53
PPL Energy Supply LLC [Member]
  
Jointly Owned Facilities [Line Items]  
Jointly Owned Utility Facilities

At December 31, 2013 and 2012, the Balance Sheets reflect the owned interests in the facilities listed below.

                Construction
     Ownership    Other Accumulated Work
     Interest Electric Plant Property Depreciation in Progress
PPL               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
  Trimble County Units 1 & 2  75.00%   1,288      144   54
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
  Trimble County Units 1 & 2  75.00%   1,279      112   43
 Merrill Creek Reservoir  8.37%    $ 22   15   

PPL Energy Supply               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
 Merrill Creek Reservoir  8.37%    $ 22   15   

LKE                
 December 31, 2013               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 308    $ 42 $ 18
  Trimble County Unit 2  75.00%   980      102   36
                  
 December 31, 2012               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 304    $ 33 $ 10
  Trimble County Unit 2  75.00%   975      79   33
                  
LG&E               
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      5   1
  Trimble County Unit 1   75.00%   308      42   18
  Trimble County Unit 2   14.25%   200      19   14
  Trimble County Units 5-6  29.00%   29      3   
  Trimble County Units 7-10  37.00%   69      7   1
  Cane Run Unit 7  22.00%            91
  Green River Unit 5  40.00%            1
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 5   
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      3   
  Trimble County Unit 1   75.00%   304      33 $ 10
  Trimble County Unit 2   14.25%   198      14   13
  Trimble County Units 5-6  29.00%   29      2   
  Trimble County Units 7-10  37.00%   68      6   2
  Cane Run Unit 7  22.00%            16
                  
KU                
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 11 $ 2
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      4   1
  Trimble County Unit 2   60.75%   780      83   22
  Trimble County Units 5-6  71.00%   70      8   
  Trimble County Units 7-10  63.00%   118      12   2
  Cane Run Unit 7  78.00%            317
  Green River Unit 5  60.00%            2
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      2   
  Trimble County Unit 2   60.75%   777      65   20
  Trimble County Units 5-6  71.00%   70      4   
  Trimble County Units 7-10  63.00%   116      10   2
  Cane Run Unit 7  78.00%            53
LG And E And KU Energy LLC [Member]
  
Jointly Owned Facilities [Line Items]  
Jointly Owned Utility Facilities

At December 31, 2013 and 2012, the Balance Sheets reflect the owned interests in the facilities listed below.

                Construction
     Ownership    Other Accumulated Work
     Interest Electric Plant Property Depreciation in Progress
PPL               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
  Trimble County Units 1 & 2  75.00%   1,288      144   54
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
  Trimble County Units 1 & 2  75.00%   1,279      112   43
 Merrill Creek Reservoir  8.37%    $ 22   15   

PPL Energy Supply               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
 Merrill Creek Reservoir  8.37%    $ 22   15   

LKE                
 December 31, 2013               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 308    $ 42 $ 18
  Trimble County Unit 2  75.00%   980      102   36
                  
 December 31, 2012               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 304    $ 33 $ 10
  Trimble County Unit 2  75.00%   975      79   33
                  
LG&E               
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      5   1
  Trimble County Unit 1   75.00%   308      42   18
  Trimble County Unit 2   14.25%   200      19   14
  Trimble County Units 5-6  29.00%   29      3   
  Trimble County Units 7-10  37.00%   69      7   1
  Cane Run Unit 7  22.00%            91
  Green River Unit 5  40.00%            1
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 5   
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      3   
  Trimble County Unit 1   75.00%   304      33 $ 10
  Trimble County Unit 2   14.25%   198      14   13
  Trimble County Units 5-6  29.00%   29      2   
  Trimble County Units 7-10  37.00%   68      6   2
  Cane Run Unit 7  22.00%            16
                  
KU                
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 11 $ 2
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      4   1
  Trimble County Unit 2   60.75%   780      83   22
  Trimble County Units 5-6  71.00%   70      8   
  Trimble County Units 7-10  63.00%   118      12   2
  Cane Run Unit 7  78.00%            317
  Green River Unit 5  60.00%            2
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      2   
  Trimble County Unit 2   60.75%   777      65   20
  Trimble County Units 5-6  71.00%   70      4   
  Trimble County Units 7-10  63.00%   116      10   2
  Cane Run Unit 7  78.00%            53
Louisville Gas And Electric Co [Member]
  
Jointly Owned Facilities [Line Items]  
Jointly Owned Utility Facilities

At December 31, 2013 and 2012, the Balance Sheets reflect the owned interests in the facilities listed below.

                Construction
     Ownership    Other Accumulated Work
     Interest Electric Plant Property Depreciation in Progress
PPL               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
  Trimble County Units 1 & 2  75.00%   1,288      144   54
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
  Trimble County Units 1 & 2  75.00%   1,279      112   43
 Merrill Creek Reservoir  8.37%    $ 22   15   

PPL Energy Supply               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
 Merrill Creek Reservoir  8.37%    $ 22   15   

LKE                
 December 31, 2013               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 308    $ 42 $ 18
  Trimble County Unit 2  75.00%   980      102   36
                  
 December 31, 2012               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 304    $ 33 $ 10
  Trimble County Unit 2  75.00%   975      79   33
                  
LG&E               
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      5   1
  Trimble County Unit 1   75.00%   308      42   18
  Trimble County Unit 2   14.25%   200      19   14
  Trimble County Units 5-6  29.00%   29      3   
  Trimble County Units 7-10  37.00%   69      7   1
  Cane Run Unit 7  22.00%            91
  Green River Unit 5  40.00%            1
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 5   
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      3   
  Trimble County Unit 1   75.00%   304      33 $ 10
  Trimble County Unit 2   14.25%   198      14   13
  Trimble County Units 5-6  29.00%   29      2   
  Trimble County Units 7-10  37.00%   68      6   2
  Cane Run Unit 7  22.00%            16
                  
KU                
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 11 $ 2
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      4   1
  Trimble County Unit 2   60.75%   780      83   22
  Trimble County Units 5-6  71.00%   70      8   
  Trimble County Units 7-10  63.00%   118      12   2
  Cane Run Unit 7  78.00%            317
  Green River Unit 5  60.00%            2
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      2   
  Trimble County Unit 2   60.75%   777      65   20
  Trimble County Units 5-6  71.00%   70      4   
  Trimble County Units 7-10  63.00%   116      10   2
  Cane Run Unit 7  78.00%            53
Kentucky Utilities Co [Member]
  
Jointly Owned Facilities [Line Items]  
Jointly Owned Utility Facilities

At December 31, 2013 and 2012, the Balance Sheets reflect the owned interests in the facilities listed below.

                Construction
     Ownership    Other Accumulated Work
     Interest Electric Plant Property Depreciation in Progress
PPL               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
  Trimble County Units 1 & 2  75.00%   1,288      144   54
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
  Trimble County Units 1 & 2  75.00%   1,279      112   43
 Merrill Creek Reservoir  8.37%    $ 22   15   

PPL Energy Supply               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
 Merrill Creek Reservoir  8.37%    $ 22   15   

LKE                
 December 31, 2013               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 308    $ 42 $ 18
  Trimble County Unit 2  75.00%   980      102   36
                  
 December 31, 2012               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 304    $ 33 $ 10
  Trimble County Unit 2  75.00%   975      79   33
                  
LG&E               
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      5   1
  Trimble County Unit 1   75.00%   308      42   18
  Trimble County Unit 2   14.25%   200      19   14
  Trimble County Units 5-6  29.00%   29      3   
  Trimble County Units 7-10  37.00%   69      7   1
  Cane Run Unit 7  22.00%            91
  Green River Unit 5  40.00%            1
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 5   
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      3   
  Trimble County Unit 1   75.00%   304      33 $ 10
  Trimble County Unit 2   14.25%   198      14   13
  Trimble County Units 5-6  29.00%   29      2   
  Trimble County Units 7-10  37.00%   68      6   2
  Cane Run Unit 7  22.00%            16
                  
KU                
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 11 $ 2
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      4   1
  Trimble County Unit 2   60.75%   780      83   22
  Trimble County Units 5-6  71.00%   70      8   
  Trimble County Units 7-10  63.00%   118      12   2
  Cane Run Unit 7  78.00%            317
  Green River Unit 5  60.00%            2
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      2   
  Trimble County Unit 2   60.75%   777      65   20
  Trimble County Units 5-6  71.00%   70      4   
  Trimble County Units 7-10  63.00%   116      10   2
  Cane Run Unit 7  78.00%            53