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Variable Interest Entities (Tables)
 3 Months Ended
Mar. 31, 2013
Consolidated Assets and Liabilities of Variable Interest Entities
AMERICAN ELECTRIC POWER COMPANY, INC. AND SUBSIDIARY COMPANIES
VARIABLE INTEREST ENTITIES
March 31, 2013
(in millions)
                  
             TCC   
    SWEPCo I&M    Transition Protected Cell
    SabineDCC FuelAEP CreditFunding of EIS
 ASSETS               
 Current Assets $ 64 $ 128 $ 871 $ 174 $ 144
 Net Property, Plant and Equipment   167   146   -   -   -
 Other Noncurrent Assets   66   73   1   2,114(a)  5
 Total Assets $ 297 $ 347 $ 872 $ 2,288 $ 149
                  
 LIABILITIES AND EQUITY               
 Current Liabilities $ 31 $ 112 $ 827 $ 293 $ 49
 Noncurrent Liabilities    266   235   1   1,977   72
 Equity   -   -   44   18   28
 Total Liabilities and Equity $ 297 $ 347 $ 872 $ 2,288 $ 149

(a)       Includes an intercompany item eliminated in consolidation of $87 million.

AMERICAN ELECTRIC POWER COMPANY, INC. AND SUBSIDIARY COMPANIES
VARIABLE INTEREST ENTITIES
December 31, 2012
(in millions)
                  
             TCC   
    SWEPCo I&M    Transition Protected Cell
    SabineDCC FuelAEP CreditFunding of EIS
  ASSETS               
  Current Assets $ 57 $ 133 $ 843 $ 250 $ 130
  Net Property, Plant and Equipment   170   176   -   -   -
  Other Noncurrent Assets   55   92   1   2,167(a)  4
  Total Assets $ 282 $ 401 $ 844 $ 2,417 $ 134
                  
  LIABILITIES AND EQUITY               
  Current Liabilities $ 32 $ 121 $ 800 $ 304 $ 43
  Noncurrent Liabilities    250   280   1   2,095   66
  Equity   -   -   43   18   25
  Total Liabilities and Equity $ 282 $ 401 $ 844 $ 2,417 $ 134

(a) Includes an intercompany item eliminated in consolidation of $89 million.
Appalachian Power Co [Member]
  
Billings from Significant Variable Interest
        
   Three Months Ended March 31,
 Company 2013 2012
   (in thousands)
 APCo $ 39,040 $ 38,546
 I&M   27,498   26,107
 OPCo   54,069   53,445
 PSO   18,161   17,596
 SWEPCo   27,480   26,720
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   March 31, 2013 December 31, 2012
   As Reported on the Maximum As Reported on the Maximum
 Company Balance Sheet Exposure Balance Sheet Exposure
   (in thousands)
 APCo $ 14,324 $ 14,324 $ 29,819 $ 29,819
 I&M   7,902   7,902   17,911   17,911
 OPCo   20,051   20,051   39,323   39,323
 PSO   6,772   6,772   13,381   13,381
 SWEPCo   9,048   9,048   19,669   19,669
Indiana Michigan Power Co [Member]
  
Billings from Significant Variable Interest
        
   Three Months Ended March 31,
 Company 2013 2012
   (in thousands)
 APCo $ 39,040 $ 38,546
 I&M   27,498   26,107
 OPCo   54,069   53,445
 PSO   18,161   17,596
 SWEPCo   27,480   26,720
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   March 31, 2013 December 31, 2012
   As Reported on the Maximum As Reported on the Maximum
 Company Balance Sheet Exposure Balance Sheet Exposure
   (in thousands)
 APCo $ 14,324 $ 14,324 $ 29,819 $ 29,819
 I&M   7,902   7,902   17,911   17,911
 OPCo   20,051   20,051   39,323   39,323
 PSO   6,772   6,772   13,381   13,381
 SWEPCo   9,048   9,048   19,669   19,669
Indiana Michigan Power Co [Member] | Billings from AEP Generating Co [Member]
  
Billings from Significant Variable Interest
        
   Three Months Ended March 31,
 Company 2013 2012
   (in thousands)
 I&M $ 58,535 $ 58,822
 OPCo   38,711   58,417
Indiana Michigan Power Co [Member] | Carrying Amount in AEGCo's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
 
              
   March 31, 2013 December 31, 2012
   As Reported on Maximum As Reported on Maximum
 Company the Balance Sheet Exposure the Balance Sheet Exposure
   (in thousands)
 I&M $ 18,543 $ 18,543 $ 25,498 $ 25,498
 OPCo   12,889   12,889   16,302   16,302
Indiana Michigan Power Co [Member] | DCC Fuel [Member]
  
Consolidated Assets and Liabilities of Variable Interest Entities
 INDIANA MICHIGAN POWER COMPANY AND SUBSIDIARIES
 VARIABLE INTEREST ENTITIES
 March 31, 2013 and December 31, 2012
 (in thousands)
   DCC Fuel
 ASSETS 2013 2012
 Current Assets $ 128,450 $ 132,886
 Net Property, Plant and Equipment   146,271   176,065
 Other Noncurrent Assets   72,589   92,473
 Total Assets $ 347,310 $ 401,424
        
 LIABILITIES AND EQUITY      
 Current Liabilities $ 112,209 $ 120,873
 Noncurrent Liabilities    235,101   280,551
 Equity   -   -
 Total Liabilities and Equity $ 347,310 $ 401,424
Ohio Power Co [Member]
  
Billings from Significant Variable Interest
        
   Three Months Ended March 31,
 Company 2013 2012
   (in thousands)
 APCo $ 39,040 $ 38,546
 I&M   27,498   26,107
 OPCo   54,069   53,445
 PSO   18,161   17,596
 SWEPCo   27,480   26,720
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   March 31, 2013 December 31, 2012
   As Reported on the Maximum As Reported on the Maximum
 Company Balance Sheet Exposure Balance Sheet Exposure
   (in thousands)
 APCo $ 14,324 $ 14,324 $ 29,819 $ 29,819
 I&M   7,902   7,902   17,911   17,911
 OPCo   20,051   20,051   39,323   39,323
 PSO   6,772   6,772   13,381   13,381
 SWEPCo   9,048   9,048   19,669   19,669
Ohio Power Co [Member] | Billings from AEP Generating Co [Member]
  
Billings from Significant Variable Interest
        
   Three Months Ended March 31,
 Company 2013 2012
   (in thousands)
 I&M $ 58,535 $ 58,822
 OPCo   38,711   58,417
Ohio Power Co [Member] | Carrying Amount in AEGCo's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
 
              
   March 31, 2013 December 31, 2012
   As Reported on Maximum As Reported on Maximum
 Company the Balance Sheet Exposure the Balance Sheet Exposure
   (in thousands)
 I&M $ 18,543 $ 18,543 $ 25,498 $ 25,498
 OPCo   12,889   12,889   16,302   16,302
Public Service Co Of Oklahoma [Member]
  
Billings from Significant Variable Interest
        
   Three Months Ended March 31,
 Company 2013 2012
   (in thousands)
 APCo $ 39,040 $ 38,546
 I&M   27,498   26,107
 OPCo   54,069   53,445
 PSO   18,161   17,596
 SWEPCo   27,480   26,720
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   March 31, 2013 December 31, 2012
   As Reported on the Maximum As Reported on the Maximum
 Company Balance Sheet Exposure Balance Sheet Exposure
   (in thousands)
 APCo $ 14,324 $ 14,324 $ 29,819 $ 29,819
 I&M   7,902   7,902   17,911   17,911
 OPCo   20,051   20,051   39,323   39,323
 PSO   6,772   6,772   13,381   13,381
 SWEPCo   9,048   9,048   19,669   19,669
Southwestern Electric Power Co [Member]
  
Billings from Significant Variable Interest
        
   Three Months Ended March 31,
 Company 2013 2012
   (in thousands)
 APCo $ 39,040 $ 38,546
 I&M   27,498   26,107
 OPCo   54,069   53,445
 PSO   18,161   17,596
 SWEPCo   27,480   26,720
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   March 31, 2013 December 31, 2012
   As Reported on the Maximum As Reported on the Maximum
 Company Balance Sheet Exposure Balance Sheet Exposure
   (in thousands)
 APCo $ 14,324 $ 14,324 $ 29,819 $ 29,819
 I&M   7,902   7,902   17,911   17,911
 OPCo   20,051   20,051   39,323   39,323
 PSO   6,772   6,772   13,381   13,381
 SWEPCo   9,048   9,048   19,669   19,669
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member]
  
Consolidated Assets and Liabilities of Variable Interest Entities
 SOUTHWESTERN ELECTRIC POWER COMPANY CONSOLIDATED
 VARIABLE INTEREST ENTITIES
 March 31, 2013 and December 31, 2012
 (in thousands)
   Sabine
 ASSETS 2013 2012
 Current Assets $ 64,194 $ 56,535
 Net Property, Plant and Equipment   167,256   170,436
 Other Noncurrent Assets   65,847   55,076
 Total Assets $ 297,297 $ 282,047
        
 LIABILITIES AND EQUITY      
 Current Liabilities $ 30,681 $ 31,446
 Noncurrent Liabilities    266,229   250,340
 Equity   387   261
 Total Liabilities and Equity $ 297,297 $ 282,047
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member]
  
Companys Investment In Joint Venture
   March 31, 2013 December 31, 2012
   As Reported on Maximum As Reported on Maximum
   the Balance SheetExposurethe Balance Sheet Exposure
   (in thousands)
 Capital Contribution from SWEPCo $ 7,643 $ 7,643 $ 7,643 $ 7,643
 Retained Earnings   912   912   946   946
 SWEPCo's Guarantee of Debt   -   39,968   -   49,564
              
 Total Investment in DHLC $ 8,555 $ 48,523 $ 8,589 $ 58,153
Dolet Hills Lignite Co, LLC [Member]
  
Companys Investment In Joint Venture
   March 31, 2013 December 31, 2012
   As Reported on Maximum As Reported on Maximum
   the Balance SheetExposure the Balance Sheet Exposure
   (in millions)
 Capital Contribution from SWEPCo $ 8 $ 8 $ 8 $ 8
 Retained Earnings   1   1   1   1
 SWEPCo's Guarantee of Debt   -   40   -   49
              
 Total Investment in DHLC $ 9 $ 49 $ 9 $ 58
PATH West Virginia Transmission Co, LLC [Member]
  
Companys Investment In Joint Venture
  March 31, 2013 December 31, 2012
  As Reported on Maximum As Reported on Maximum
  the Balance SheetExposurethe Balance SheetExposure
    (in millions)   
 Capital Contribution from AEP$ 19 $ 19 $ 19 $ 19
 Retained Earnings  12   12   12   12
             
 Total Investment in PATH-WV$ 31 $ 31 $ 31 $ 31