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Variable Interest Entities (Tables)
 9 Months Ended
Sep. 30, 2013
Consolidated Assets and Liabilities of Variable Interest Entities
AMERICAN ELECTRIC POWER COMPANY, INC. AND SUBSIDIARY COMPANIES
VARIABLE INTEREST ENTITIES
September 30, 2013
(in millions)
                    
                OPCo   
                Ohio   
             TCC Phase-in- Protected
    SWEPCo I&M    Transition Recovery Cell
    SabineDCC FuelAEP CreditFunding Funding of EIS
 ASSETS                  
 Current Assets $ 65 $ 155 $ 972 $ 197 $ 12 $ 146
 Net Property, Plant and Equipment   160   181   -   -   -   -
 Other Noncurrent Assets   56   79   1   1,989(a)  261(b)  4
 Total Assets $ 281 $ 415 $ 973 $ 2,186 $ 273 $ 150
                     
 LIABILITIES AND EQUITY                  
 Current Liabilities $ 32 $ 139 $ 856 $ 298 $ 36 $ 46
 Noncurrent Liabilities    249   276   1   1,870   236   70
 Equity   -   -   116   18   1   34
 Total Liabilities and Equity $ 281 $ 415 $ 973 $ 2,186 $ 273 $ 150

(a) Includes an intercompany item eliminated in consolidation of $84 million.

(b) Includes an intercompany item eliminated in consolidation of $121 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 September 30, Nine Months Ended September 30,
 Company 2013 2012 2013 2012
   (in thousands)
 APCo $ 39,779 $ 47,820 $ 120,315 $ 130,260
 I&M   25,988   31,134   82,192   88,618
 OPCo   58,528   72,751   169,949   193,686
 PSO   19,535   21,728   57,504   60,625
 SWEPCo   28,431   33,154   85,506   93,120
Appalachian Power Co [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   September 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 $ 7,637 $ 7,637 $ 29,819 $ 29,819
 I&M   6,560   6,560   17,911   17,911
 OPCo   14,217   14,217   39,323   39,323
 PSO   4,710   4,710   13,381   13,381
 SWEPCo   6,778   6,778   19,669   19,669
Indiana Michigan Power Co [Member] | Billings from AEP Generating Co [Member]
  
Billings from Significant Variable Interest
              
   Three Months Ended September 30, Nine Months Ended September 30,
 Company 2013 2012 2013 2012
   (in thousands)
 I&M $ 66,114 $ 65,051 $ 177,840 $ 177,790
 OPCo   37,255   46,184   107,876   149,424
Indiana Michigan Power Co [Member] | Billings from American Electric Power Service Corporation [Member]
  
Billings from Significant Variable Interest
              
   Three Months Ended September 30, Nine Months Ended September 30,
 Company 2013 2012 2013 2012
   (in thousands)
 APCo $ 39,779 $ 47,820 $ 120,315 $ 130,260
 I&M   25,988   31,134   82,192   88,618
 OPCo   58,528   72,751   169,949   193,686
 PSO   19,535   21,728   57,504   60,625
 SWEPCo   28,431   33,154   85,506   93,120
Indiana Michigan Power Co [Member] | Carrying Amount in AEGCo's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
 
              
   September 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 $ 26,323 $ 26,323 $ 25,498 $ 25,498
 OPCo   9,708   9,708   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
              
   September 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 $ 7,637 $ 7,637 $ 29,819 $ 29,819
 I&M   6,560   6,560   17,911   17,911
 OPCo   14,217   14,217   39,323   39,323
 PSO   4,710   4,710   13,381   13,381
 SWEPCo   6,778   6,778   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
 September 30, 2013 and December 31, 2012
 (in thousands)
   DCC Fuel
 ASSETS 2013 2012
 Current Assets $ 155,448 $ 132,886
 Net Property, Plant and Equipment   180,541   176,065
 Other Noncurrent Assets   78,689   92,473
 Total Assets $ 414,678 $ 401,424
        
 LIABILITIES AND EQUITY      
 Current Liabilities $ 138,796 $ 120,873
 Noncurrent Liabilities    275,882   280,551
 Total Liabilities and Equity $ 414,678 $ 401,424
Ohio Power Co [Member] | Billings from AEP Generating Co [Member]
  
Billings from Significant Variable Interest
              
   Three Months Ended September 30, Nine Months Ended September 30,
 Company 2013 2012 2013 2012
   (in thousands)
 I&M $ 66,114 $ 65,051 $ 177,840 $ 177,790
 OPCo   37,255   46,184   107,876   149,424
Ohio Power Co [Member] | Billings from American Electric Power Service Corporation [Member]
  
Billings from Significant Variable Interest
              
   Three Months Ended September 30, Nine Months Ended September 30,
 Company 2013 2012 2013 2012
   (in thousands)
 APCo $ 39,779 $ 47,820 $ 120,315 $ 130,260
 I&M   25,988   31,134   82,192   88,618
 OPCo   58,528   72,751   169,949   193,686
 PSO   19,535   21,728   57,504   60,625
 SWEPCo   28,431   33,154   85,506   93,120
Ohio Power Co [Member] | Carrying Amount in AEGCo's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
 
              
   September 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 $ 26,323 $ 26,323 $ 25,498 $ 25,498
 OPCo   9,708   9,708   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
              
   September 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 $ 7,637 $ 7,637 $ 29,819 $ 29,819
 I&M   6,560   6,560   17,911   17,911
 OPCo   14,217   14,217   39,323   39,323
 PSO   4,710   4,710   13,381   13,381
 SWEPCo   6,778   6,778   19,669   19,669
Ohio Power Co [Member] | Ohio Phase-In-Recovery Funding [Member]
  
Consolidated Assets and Liabilities of Variable Interest Entities
 OHIO POWER COMPANY AND SUBSIDIARIES
 VARIABLE INTEREST ENTITIES
 September 30, 2013
 (in thousands)
   Ohio
   Phase-in-
   Recovery
   Funding
 ASSETS 2013
 Current Assets $ 12,021
 Other Noncurrent Assets (a)   261,005
 Total Assets $ 273,026
     
 LIABILITIES AND EQUITY   
 Current Liabilities $ 35,550
 Noncurrent Liabilities    236,139
 Equity   1,337
 Total Liabilities and Equity $ 273,026

(a)        Includes an intercompany item eliminated in consolidation of $121 million.
Public Service Co Of Oklahoma [Member] | Billings from American Electric Power Service Corporation [Member]
  
Billings from Significant Variable Interest
              
   Three Months Ended September 30, Nine Months Ended September 30,
 Company 2013 2012 2013 2012
   (in thousands)
 APCo $ 39,779 $ 47,820 $ 120,315 $ 130,260
 I&M   25,988   31,134   82,192   88,618
 OPCo   58,528   72,751   169,949   193,686
 PSO   19,535   21,728   57,504   60,625
 SWEPCo   28,431   33,154   85,506   93,120
Public Service Co Of Oklahoma [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   September 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 $ 7,637 $ 7,637 $ 29,819 $ 29,819
 I&M   6,560   6,560   17,911   17,911
 OPCo   14,217   14,217   39,323   39,323
 PSO   4,710   4,710   13,381   13,381
 SWEPCo   6,778   6,778   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 September 30, Nine Months Ended September 30,
 Company 2013 2012 2013 2012
   (in thousands)
 APCo $ 39,779 $ 47,820 $ 120,315 $ 130,260
 I&M   25,988   31,134   82,192   88,618
 OPCo   58,528   72,751   169,949   193,686
 PSO   19,535   21,728   57,504   60,625
 SWEPCo   28,431   33,154   85,506   93,120
Southwestern Electric Power Co [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
  
Carrying Amount and Classification of Variable Interest in Accounts Payable
              
   September 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 $ 7,637 $ 7,637 $ 29,819 $ 29,819
 I&M   6,560   6,560   17,911   17,911
 OPCo   14,217   14,217   39,323   39,323
 PSO   4,710   4,710   13,381   13,381
 SWEPCo   6,778   6,778   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
 September 30, 2013 and December 31, 2012
 (in thousands)
   Sabine
 ASSETS 2013 2012
 Current Assets $ 64,737 $ 56,535
 Net Property, Plant and Equipment   160,575   170,436
 Other Noncurrent Assets   55,760   55,076
 Total Assets $ 281,072 $ 282,047
        
 LIABILITIES AND EQUITY      
 Current Liabilities $ 32,005 $ 31,446
 Noncurrent Liabilities    248,745   250,340
 Equity   322   261
 Total Liabilities and Equity $ 281,072 $ 282,047
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member]
  
Companys Investment In Joint Venture
   September 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   1,102   1,102   946   946
 SWEPCo's Guarantee of Debt   -   44,897   -   49,564
              
 Total Investment in DHLC $ 8,745 $ 53,642 $ 8,589 $ 58,153
Dolet Hills Lignite Co, LLC [Member]
  
Companys Investment In Joint Venture
   September 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   -   45   -   49
              
 Total Investment in DHLC $ 9 $ 54 $ 9 $ 58
PATH West Virginia Transmission Co, LLC [Member]
  
Companys Investment In Joint Venture
  September 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  14   14   12   12
             
 Total Investment in PATH-WV$ 33 $ 33 $ 31 $ 31