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Variable Interest Entities (Tables)
 6 Months Ended
Jun. 30, 2013
Consolidated Assets and Liabilities of Variable Interest Entities
AMERICAN ELECTRIC POWER COMPANY, INC. AND SUBSIDIARY COMPANIES
VARIABLE INTEREST ENTITIES
June 30, 2013
(in millions)
                  
             TCC   
    SWEPCo I&M    Transition Protected Cell
    SabineDCC FuelAEP CreditFunding of EIS
 ASSETS               
 Current Assets $ 66 $ 161 $ 963 $ 221 $ 136
 Net Property, Plant and Equipment   163   219   -   -   -
 Other Noncurrent Assets   66   104   -   2,060(a)  5
 Total Assets $ 295 $ 484 $ 963 $ 2,281 $ 141
                  
 LIABILITIES AND EQUITY               
 Current Liabilities $ 31 $ 143 $ 904 $ 307 $ 42
 Noncurrent Liabilities    264   341   1   1,956   68
 Equity   -   -   58   18   31
 Total Liabilities and Equity $ 295 $ 484 $ 963 $ 2,281 $ 141

(a)       Includes an intercompany item eliminated in consolidation of $86 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 American Electric Power Service Corporation [Member]
  
Billings from Significant Variable Interest
              
   Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
   (in thousands)
 APCo $ 41,496 $ 43,894 $ 80,537 $ 82,440
 I&M   28,706   31,377   56,204   57,484
 OPCo   57,351   67,490   111,420   120,935
 PSO   19,807   21,301   37,969   38,897
 SWEPCo   29,595   33,246   57,075   59,966
Appalachian Power Co [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   June 30, 2013 December 31, 2012
   As Reported on the Maximum As Reported on the Maximum
 Company Balance Sheet Exposure Balance Sheet Exposure
   (in thousands)
 APCo $ 12,440 $ 12,440 $ 29,819 $ 29,819
 I&M   7,764   7,764   17,911   17,911
 OPCo   16,800   16,800   39,323   39,323
 PSO   5,380   5,380   13,381   13,381
 SWEPCo   8,801   8,801   19,669   19,669
Indiana Michigan Power Co [Member] | Billings from AEP Generating Co [Member]
  
Billings from Significant Variable Interest
              
   Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
   (in thousands)
 I&M $ 53,191 $ 53,917 $ 111,726 $ 112,739
 OPCo   31,910   44,823   70,621   103,239
Indiana Michigan Power Co [Member] | Billings from American Electric Power Service Corporation [Member]
  
Billings from Significant Variable Interest
              
   Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
   (in thousands)
 APCo $ 41,496 $ 43,894 $ 80,537 $ 82,440
 I&M   28,706   31,377   56,204   57,484
 OPCo   57,351   67,490   111,420   120,935
 PSO   19,807   21,301   37,969   38,897
 SWEPCo   29,595   33,246   57,075   59,966
Indiana Michigan Power Co [Member] | Carrying Amount in AEGCo's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
 
              
   June 30, 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 $ 20,126 $ 20,126 $ 25,498 $ 25,498
 OPCo   12,771   12,771   16,302   16,302
Indiana Michigan Power Co [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   June 30, 2013 December 31, 2012
   As Reported on the Maximum As Reported on the Maximum
 Company Balance Sheet Exposure Balance Sheet Exposure
   (in thousands)
 APCo $ 12,440 $ 12,440 $ 29,819 $ 29,819
 I&M   7,764   7,764   17,911   17,911
 OPCo   16,800   16,800   39,323   39,323
 PSO   5,380   5,380   13,381   13,381
 SWEPCo   8,801   8,801   19,669   19,669
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
 June 30, 2013 and December 31, 2012
 (in thousands)
   DCC Fuel
 ASSETS 2013 2012
 Current Assets $ 161,377 $ 132,886
 Net Property, Plant and Equipment   219,101   176,065
 Other Noncurrent Assets   104,035   92,473
 Total Assets $ 484,513 $ 401,424
        
 LIABILITIES AND EQUITY      
 Current Liabilities $ 142,829 $ 120,873
 Noncurrent Liabilities    341,684   280,551
 Equity   -   -
 Total Liabilities and Equity $ 484,513 $ 401,424
Ohio Power Co [Member] | Billings from AEP Generating Co [Member]
  
Billings from Significant Variable Interest
              
   Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
   (in thousands)
 I&M $ 53,191 $ 53,917 $ 111,726 $ 112,739
 OPCo   31,910   44,823   70,621   103,239
Ohio Power Co [Member] | Billings from American Electric Power Service Corporation [Member]
  
Billings from Significant Variable Interest
              
   Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
   (in thousands)
 APCo $ 41,496 $ 43,894 $ 80,537 $ 82,440
 I&M   28,706   31,377   56,204   57,484
 OPCo   57,351   67,490   111,420   120,935
 PSO   19,807   21,301   37,969   38,897
 SWEPCo   29,595   33,246   57,075   59,966
Ohio Power Co [Member] | Carrying Amount in AEGCo's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
 
              
   June 30, 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 $ 20,126 $ 20,126 $ 25,498 $ 25,498
 OPCo   12,771   12,771   16,302   16,302
Ohio Power Co [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   June 30, 2013 December 31, 2012
   As Reported on the Maximum As Reported on the Maximum
 Company Balance Sheet Exposure Balance Sheet Exposure
   (in thousands)
 APCo $ 12,440 $ 12,440 $ 29,819 $ 29,819
 I&M   7,764   7,764   17,911   17,911
 OPCo   16,800   16,800   39,323   39,323
 PSO   5,380   5,380   13,381   13,381
 SWEPCo   8,801   8,801   19,669   19,669
Public Service Co Of Oklahoma [Member] | Billings from American Electric Power Service Corporation [Member]
  
Billings from Significant Variable Interest
              
   Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
   (in thousands)
 APCo $ 41,496 $ 43,894 $ 80,537 $ 82,440
 I&M   28,706   31,377   56,204   57,484
 OPCo   57,351   67,490   111,420   120,935
 PSO   19,807   21,301   37,969   38,897
 SWEPCo   29,595   33,246   57,075   59,966
Public Service Co Of Oklahoma [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   June 30, 2013 December 31, 2012
   As Reported on the Maximum As Reported on the Maximum
 Company Balance Sheet Exposure Balance Sheet Exposure
   (in thousands)
 APCo $ 12,440 $ 12,440 $ 29,819 $ 29,819
 I&M   7,764   7,764   17,911   17,911
 OPCo   16,800   16,800   39,323   39,323
 PSO   5,380   5,380   13,381   13,381
 SWEPCo   8,801   8,801   19,669   19,669
Southwestern Electric Power Co [Member] | Billings from American Electric Power Service Corporation [Member]
  
Billings from Significant Variable Interest
              
   Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
   (in thousands)
 APCo $ 41,496 $ 43,894 $ 80,537 $ 82,440
 I&M   28,706   31,377   56,204   57,484
 OPCo   57,351   67,490   111,420   120,935
 PSO   19,807   21,301   37,969   38,897
 SWEPCo   29,595   33,246   57,075   59,966
Southwestern Electric Power Co [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   June 30, 2013 December 31, 2012
   As Reported on the Maximum As Reported on the Maximum
 Company Balance Sheet Exposure Balance Sheet Exposure
   (in thousands)
 APCo $ 12,440 $ 12,440 $ 29,819 $ 29,819
 I&M   7,764   7,764   17,911   17,911
 OPCo   16,800   16,800   39,323   39,323
 PSO   5,380   5,380   13,381   13,381
 SWEPCo   8,801   8,801   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
 June 30, 2013 and December 31, 2012
 (in thousands)
   Sabine
 ASSETS 2013 2012
 Current Assets $ 65,744 $ 56,535
 Net Property, Plant and Equipment   163,078   170,436
 Other Noncurrent Assets   65,952   55,076
 Total Assets $ 294,774 $ 282,047
        
 LIABILITIES AND EQUITY      
 Current Liabilities $ 30,854 $ 31,446
 Noncurrent Liabilities    263,553   250,340
 Equity   367   261
 Total Liabilities and Equity $ 294,774 $ 282,047
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member]
  
Companys Investment In Joint Venture
   June 30, 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   974   974   946   946
 SWEPCo's Guarantee of Debt   -   49,600   -   49,564
              
 Total Investment in DHLC $ 8,617 $ 58,217 $ 8,589 $ 58,153
Dolet Hills Lignite Co, LLC [Member]
  
Companys Investment In Joint Venture
   June 30, 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   -   50   -   49
              
 Total Investment in DHLC $ 9 $ 59 $ 9 $ 58
PATH West Virginia Transmission Co, LLC [Member]
  
Companys Investment In Joint Venture
  June 30, 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  13   13   12   12
             
 Total Investment in PATH-WV$ 32 $ 32 $ 31 $ 31