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Segment and Related Information (Tables)
3 Months Ended
Mar. 31, 2013
Segment and Related Information [Abstract]  
Segment and Related Information

Financial data for the segments for the periods ended March 31 are:

            Three Months
      2013 2012
Income Statement Data            
Revenues from external customers            
 Kentucky Regulated       $ 800 $ 705
 U.K. Regulated         648   562
 Pennsylvania Regulated         512   457
 Supply (a)         494   2,388
 Corporate and Other         3   
Total       $ 2,457 $ 4,112
                 
Intersegment electric revenues            
 Pennsylvania Regulated       $ 1 $ 1
 Supply         14   21
                 
Net Income Attributable to PPL Shareowners            
 Kentucky Regulated       $ 85 $ 42
 U.K. Regulated (a)         313   165
 Pennsylvania Regulated         64   33
 Supply (a)         (46)   301
 Corporate and Other         (3)   
Total       $ 413 $ 541

   March 31, December 31,
   2013 2012
Balance Sheet Data      
Assets      
 Kentucky Regulated $ 10,870 $ 10,670
 U.K. Regulated   13,816   14,073
 Pennsylvania Regulated   6,267   6,023
 Supply   12,041   12,868
 Corporate and Other (b)   347   
Total assets $ 43,341 $ 43,634

(a)       Includes unrealized gains and losses from economic activity. See Note 14 for additional information.

(b)       Primarily consists of unallocated assets, including cash, PP&E and the elimination of inter-segment transactions.