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Financing Activities (Tables)
 3 Months Ended
Mar. 31, 2014
Long-term Debt
 Type of Debt March 31, 2014 December 31, 2013
   (in millions)
 Senior Unsecured Notes $ 11,571 $ 11,799
 Pollution Control Bonds   1,932   1,932
 Notes Payable   342   369
 Securitization Bonds   2,574   2,686
 Spent Nuclear Fuel Obligation (a)   265   265
 Other Long-term Debt    1,434   1,360
 Fair Value of Interest Rate Hedges   (7)   (9)
 Unamortized Discount, Net   (24)   (25)
 Total Long-term Debt Outstanding   18,087   18,377
 Long-term Debt Due Within One Year   1,612   1,549
 Long-term Debt  $ 16,475 $ 16,828

(a)       Pursuant to the Nuclear Waste Policy Act of 1982, I&M, a nuclear licensee, has an obligation to the United States Department of Energy for spent nuclear fuel disposal. The obligation includes a one-time fee for nuclear fuel consumed prior to April 7, 1983. Trust fund assets related to this obligation were $309 million and $309 million as of March 31, 2014 and December 31, 2013, respectively, and are included in Spent Nuclear Fuel and Decommissioning Trusts on our condensed balance sheets.

 
Long-term Debt Issuances
      Principal   Interest  
 Company Type of Debt Amount  Rate Due Date
 Issuances:  (in millions) (%)  
 PSO Other Long-term Debt $ 50  Variable 2016
             
 Non-Registrant:          
 Transource Missouri Other Long-term Debt   27  Variable 2018
 Total Issuances   $ 77(a)    

(a)       Amount indicated on the statement of cash flows is net of issuance costs and premium or discount and will not tie to the total issuances.
Retirements and Principal Payments
      Principal   Interest  
 Company Type of Debt Amount Paid  Rate Due Date
 Retirements and   (in millions) (%)  
  Principal Payments:          
 I&M Notes Payable $ 5  Variable 2016
 I&M Notes Payable   4  2.12 2016
 I&M Notes Payable   5  Variable 2016
 I&M Notes Payable   10  Variable 2017
 I&M Other Long-term Debt   2  Variable 2015
 OPCo Senior Unsecured Notes   225  4.85 2014
 SWEPCo Notes Payable   2  4.58 2032
             
 Non-Registrant:          
 AEGCo Senior Unsecured Notes   4  6.33 2037
 AEP Subsidiaries Notes Payable   1  Variable 2017
 TCC Securitization Bonds   72  5.09 2015
 TCC Securitization Bonds   40  6.25 2016
 Total Retirements and          
  Principal Payments   $ 370     
Short Term Debt
    March 31, 2014 December 31, 2013
    Outstanding Interest Outstanding Interest
 Type of DebtAmountRate (a) AmountRate (a)
   (in millions)    (in millions)   
 Securitized Debt for Receivables (b) $ 700  0.24% $ 700  0.23%
 Commercial Paper   632  0.31%   57  0.29%
 Total Short-term Debt $ 1,332    $ 757   

(a)       Weighted average rate.

(b)       Amount of securitized debt for receivables as accounted for under the ''Transfers and Servicing'' accounting guidance.

 
Comparative Accounts Receivable Information
    Three Months Ended  
    March 31, 
    2014 2013 
   (dollars in millions) 
 Effective Interest Rates on Securitization of Accounts Receivable   0.24%  0.23%
 Net Uncollectible Accounts Receivable Written Off $ 8 $ 7 
Customer Accounts Receivable Managed Portfolio
    March 31, December 31,
    2014 2013
    (in millions)
 Accounts Receivable Retained Interest and Pledged as Collateral      
  Less Uncollectible Accounts $ 997 $ 929
 Total Principal Outstanding   700   700
 Delinquent Securitized Accounts Receivable   55   45
 Bad Debt Reserves Related to Securitization/Sale of Accounts Receivable   17   16
 Unbilled Receivables Related to Securitization/Sale of Accounts Receivable   278   331
Appalachian Power Co [Member]
  
Long-term Debt Issuances
     Principal  Interest  
 Company Type of Debt Amount (a) Rate Due Date
 Issuances:   (in thousands) (%)  
 PSO Other Long-term Debt $ 50,000 Variable 2016

(a)       Amounts indicated on the statements of cash flows are net of issuance costs and premium or discount and will not tie to the issuance amounts.
Retirements and Principal Payments
      Principal  Interest  
 Company Type of Debt Amount Paid Rate Due Date
 Retirements and   (in thousands) (%)  
  Principal Payments:         
 APCo Land Note $ 8 13.718 2026
 I&M Notes Payable   9,866 Variable 2017
 I&M Notes Payable   5,324 Variable 2016
 I&M Notes Payable   5,214 Variable 2016
 I&M Notes Payable   3,611 2.12 2016
 I&M Other Long-term Debt   2,063 Variable 2015
 I&M Other Long-term Debt   259 6.00 2025
 OPCo Other Long-term Debt   29 1.149 2028
 OPCo Senior Unsecured Notes   225,000 4.85 2014
 PSO Other Long-term Debt   102 3.00 2027
 SWEPCo Notes Payable   1,625 4.58 2032
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
               Net   
               Loans to   
   Maximum Maximum Average Average (Borrowings from) Authorized
   Borrowings Loans  Borrowings Loans  the Utility Short-term
   from the Utility to the Utility from the Utility to the Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool March 31, 2014 Limit
   (in thousands)
 APCo $ - $ 249,630 $ - $ 164,681 $ 245,516 $ 600,000
 I&M   -   158,857   -   92,303   59,162   500,000
 OPCo   55,640   405,350   25,930   135,747   (27,108)   600,000
 PSO   121,100   -   58,500   -   (70,119)   300,000
 SWEPCo   130,258   -   61,132   -   (117,342)   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Three Months Ended March 31,
   2014 2013
 Maximum Interest Rate  0.33%  0.43%
 Minimum Interest Rate  0.28%  0.35%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
   Average Interest Rate  Average Interest Rate
   for Funds Borrowed   for Funds Loaned
   from the Utility Money Pool for   to the Utility Money Pool for
   Three Months Ended March 31, Three Months Ended March 31,
 Company 2014 20132014 2013
 APCo  -%  0.38%  0.31%  0.37%
 I&M  -%  0.36%  0.31%  0.37%
 OPCo  0.31%  0.36%  0.29%  0.37%
 PSO  0.31%  0.36%  -%  0.38%
 SWEPCo  0.31%  -%  -%  0.38%
Accounts Receivable and Accrued Unbilled Revenues
    March 31, December 31,
 Company 2014 2013
    (in thousands)
 APCo $ 175,738 $ 156,599
 I&M   154,510   139,257
 OPCo   350,735   324,287
 PSO   111,522   115,260
 SWEPCo   145,648   149,337
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Three Months Ended March 31,
 Company 2014 2013
    (in thousands)
 APCo $ 2,423 $ 1,556
 I&M   2,040   1,452
 OPCo   7,498   4,669
 PSO   1,323   1,414
 SWEPCo   1,566   1,380
Proceeds on Sale of Receivables to AEP Credit
    Three Months Ended March 31,
 Company 2014 2013
    (in thousands)
 APCo $ 437,196 $ 398,193
 I&M   407,150   351,830
 OPCo   686,627   696,958
 PSO   290,217   240,275
 SWEPCo   390,588   331,936
Indiana Michigan Power Co [Member]
  
Long-term Debt Issuances
     Principal  Interest  
 Company Type of Debt Amount (a) Rate Due Date
 Issuances:   (in thousands) (%)  
 PSO Other Long-term Debt $ 50,000 Variable 2016

(a)       Amounts indicated on the statements of cash flows are net of issuance costs and premium or discount and will not tie to the issuance amounts.
Retirements and Principal Payments
      Principal  Interest  
 Company Type of Debt Amount Paid Rate Due Date
 Retirements and   (in thousands) (%)  
  Principal Payments:         
 APCo Land Note $ 8 13.718 2026
 I&M Notes Payable   9,866 Variable 2017
 I&M Notes Payable   5,324 Variable 2016
 I&M Notes Payable   5,214 Variable 2016
 I&M Notes Payable   3,611 2.12 2016
 I&M Other Long-term Debt   2,063 Variable 2015
 I&M Other Long-term Debt   259 6.00 2025
 OPCo Other Long-term Debt   29 1.149 2028
 OPCo Senior Unsecured Notes   225,000 4.85 2014
 PSO Other Long-term Debt   102 3.00 2027
 SWEPCo Notes Payable   1,625 4.58 2032
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
               Net   
               Loans to   
   Maximum Maximum Average Average (Borrowings from) Authorized
   Borrowings Loans  Borrowings Loans  the Utility Short-term
   from the Utility to the Utility from the Utility to the Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool March 31, 2014 Limit
   (in thousands)
 APCo $ - $ 249,630 $ - $ 164,681 $ 245,516 $ 600,000
 I&M   -   158,857   -   92,303   59,162   500,000
 OPCo   55,640   405,350   25,930   135,747   (27,108)   600,000
 PSO   121,100   -   58,500   -   (70,119)   300,000
 SWEPCo   130,258   -   61,132   -   (117,342)   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Three Months Ended March 31,
   2014 2013
 Maximum Interest Rate  0.33%  0.43%
 Minimum Interest Rate  0.28%  0.35%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
   Average Interest Rate  Average Interest Rate
   for Funds Borrowed   for Funds Loaned
   from the Utility Money Pool for   to the Utility Money Pool for
   Three Months Ended March 31, Three Months Ended March 31,
 Company 2014 20132014 2013
 APCo  -%  0.38%  0.31%  0.37%
 I&M  -%  0.36%  0.31%  0.37%
 OPCo  0.31%  0.36%  0.29%  0.37%
 PSO  0.31%  0.36%  -%  0.38%
 SWEPCo  0.31%  -%  -%  0.38%
Accounts Receivable and Accrued Unbilled Revenues
    March 31, December 31,
 Company 2014 2013
    (in thousands)
 APCo $ 175,738 $ 156,599
 I&M   154,510   139,257
 OPCo   350,735   324,287
 PSO   111,522   115,260
 SWEPCo   145,648   149,337
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Three Months Ended March 31,
 Company 2014 2013
    (in thousands)
 APCo $ 2,423 $ 1,556
 I&M   2,040   1,452
 OPCo   7,498   4,669
 PSO   1,323   1,414
 SWEPCo   1,566   1,380
Proceeds on Sale of Receivables to AEP Credit
    Three Months Ended March 31,
 Company 2014 2013
    (in thousands)
 APCo $ 437,196 $ 398,193
 I&M   407,150   351,830
 OPCo   686,627   696,958
 PSO   290,217   240,275
 SWEPCo   390,588   331,936
Ohio Power Co [Member]
  
Long-term Debt Issuances
     Principal  Interest  
 Company Type of Debt Amount (a) Rate Due Date
 Issuances:   (in thousands) (%)  
 PSO Other Long-term Debt $ 50,000 Variable 2016

(a)       Amounts indicated on the statements of cash flows are net of issuance costs and premium or discount and will not tie to the issuance amounts.
Retirements and Principal Payments
      Principal  Interest  
 Company Type of Debt Amount Paid Rate Due Date
 Retirements and   (in thousands) (%)  
  Principal Payments:         
 APCo Land Note $ 8 13.718 2026
 I&M Notes Payable   9,866 Variable 2017
 I&M Notes Payable   5,324 Variable 2016
 I&M Notes Payable   5,214 Variable 2016
 I&M Notes Payable   3,611 2.12 2016
 I&M Other Long-term Debt   2,063 Variable 2015
 I&M Other Long-term Debt   259 6.00 2025
 OPCo Other Long-term Debt   29 1.149 2028
 OPCo Senior Unsecured Notes   225,000 4.85 2014
 PSO Other Long-term Debt   102 3.00 2027
 SWEPCo Notes Payable   1,625 4.58 2032
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
               Net   
               Loans to   
   Maximum Maximum Average Average (Borrowings from) Authorized
   Borrowings Loans  Borrowings Loans  the Utility Short-term
   from the Utility to the Utility from the Utility to the Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool March 31, 2014 Limit
   (in thousands)
 APCo $ - $ 249,630 $ - $ 164,681 $ 245,516 $ 600,000
 I&M   -   158,857   -   92,303   59,162   500,000
 OPCo   55,640   405,350   25,930   135,747   (27,108)   600,000
 PSO   121,100   -   58,500   -   (70,119)   300,000
 SWEPCo   130,258   -   61,132   -   (117,342)   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Three Months Ended March 31,
   2014 2013
 Maximum Interest Rate  0.33%  0.43%
 Minimum Interest Rate  0.28%  0.35%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
   Average Interest Rate  Average Interest Rate
   for Funds Borrowed   for Funds Loaned
   from the Utility Money Pool for   to the Utility Money Pool for
   Three Months Ended March 31, Three Months Ended March 31,
 Company 2014 20132014 2013
 APCo  -%  0.38%  0.31%  0.37%
 I&M  -%  0.36%  0.31%  0.37%
 OPCo  0.31%  0.36%  0.29%  0.37%
 PSO  0.31%  0.36%  -%  0.38%
 SWEPCo  0.31%  -%  -%  0.38%
Accounts Receivable and Accrued Unbilled Revenues
    March 31, December 31,
 Company 2014 2013
    (in thousands)
 APCo $ 175,738 $ 156,599
 I&M   154,510   139,257
 OPCo   350,735   324,287
 PSO   111,522   115,260
 SWEPCo   145,648   149,337
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Three Months Ended March 31,
 Company 2014 2013
    (in thousands)
 APCo $ 2,423 $ 1,556
 I&M   2,040   1,452
 OPCo   7,498   4,669
 PSO   1,323   1,414
 SWEPCo   1,566   1,380
Proceeds on Sale of Receivables to AEP Credit
    Three Months Ended March 31,
 Company 2014 2013
    (in thousands)
 APCo $ 437,196 $ 398,193
 I&M   407,150   351,830
 OPCo   686,627   696,958
 PSO   290,217   240,275
 SWEPCo   390,588   331,936
Public Service Co Of Oklahoma [Member]
  
Long-term Debt Issuances
     Principal  Interest  
 Company Type of Debt Amount (a) Rate Due Date
 Issuances:   (in thousands) (%)  
 PSO Other Long-term Debt $ 50,000 Variable 2016

(a)       Amounts indicated on the statements of cash flows are net of issuance costs and premium or discount and will not tie to the issuance amounts.

 
Retirements and Principal Payments
      Principal  Interest  
 Company Type of Debt Amount Paid Rate Due Date
 Retirements and   (in thousands) (%)  
  Principal Payments:         
 APCo Land Note $ 8 13.718 2026
 I&M Notes Payable   9,866 Variable 2017
 I&M Notes Payable   5,324 Variable 2016
 I&M Notes Payable   5,214 Variable 2016
 I&M Notes Payable   3,611 2.12 2016
 I&M Other Long-term Debt   2,063 Variable 2015
 I&M Other Long-term Debt   259 6.00 2025
 OPCo Other Long-term Debt   29 1.149 2028
 OPCo Senior Unsecured Notes   225,000 4.85 2014
 PSO Other Long-term Debt   102 3.00 2027
 SWEPCo Notes Payable   1,625 4.58 2032
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
               Net   
               Loans to   
   Maximum Maximum Average Average (Borrowings from) Authorized
   Borrowings Loans  Borrowings Loans  the Utility Short-term
   from the Utility to the Utility from the Utility to the Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool March 31, 2014 Limit
   (in thousands)
 APCo $ - $ 249,630 $ - $ 164,681 $ 245,516 $ 600,000
 I&M   -   158,857   -   92,303   59,162   500,000
 OPCo   55,640   405,350   25,930   135,747   (27,108)   600,000
 PSO   121,100   -   58,500   -   (70,119)   300,000
 SWEPCo   130,258   -   61,132   -   (117,342)   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Three Months Ended March 31,
   2014 2013
 Maximum Interest Rate  0.33%  0.43%
 Minimum Interest Rate  0.28%  0.35%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
   Average Interest Rate  Average Interest Rate
   for Funds Borrowed   for Funds Loaned
   from the Utility Money Pool for   to the Utility Money Pool for
   Three Months Ended March 31, Three Months Ended March 31,
 Company 2014 20132014 2013
 APCo  -%  0.38%  0.31%  0.37%
 I&M  -%  0.36%  0.31%  0.37%
 OPCo  0.31%  0.36%  0.29%  0.37%
 PSO  0.31%  0.36%  -%  0.38%
 SWEPCo  0.31%  -%  -%  0.38%
Accounts Receivable and Accrued Unbilled Revenues
    March 31, December 31,
 Company 2014 2013
    (in thousands)
 APCo $ 175,738 $ 156,599
 I&M   154,510   139,257
 OPCo   350,735   324,287
 PSO   111,522   115,260
 SWEPCo   145,648   149,337
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Three Months Ended March 31,
 Company 2014 2013
    (in thousands)
 APCo $ 2,423 $ 1,556
 I&M   2,040   1,452
 OPCo   7,498   4,669
 PSO   1,323   1,414
 SWEPCo   1,566   1,380
Proceeds on Sale of Receivables to AEP Credit
    Three Months Ended March 31,
 Company 2014 2013
    (in thousands)
 APCo $ 437,196 $ 398,193
 I&M   407,150   351,830
 OPCo   686,627   696,958
 PSO   290,217   240,275
 SWEPCo   390,588   331,936
Southwestern Electric Power Co [Member]
  
Long-term Debt Issuances
     Principal  Interest  
 Company Type of Debt Amount (a) Rate Due Date
 Issuances:   (in thousands) (%)  
 PSO Other Long-term Debt $ 50,000 Variable 2016

(a)       Amounts indicated on the statements of cash flows are net of issuance costs and premium or discount and will not tie to the issuance amounts.

 
Retirements and Principal Payments
      Principal  Interest  
 Company Type of Debt Amount Paid Rate Due Date
 Retirements and   (in thousands) (%)  
  Principal Payments:         
 APCo Land Note $ 8 13.718 2026
 I&M Notes Payable   9,866 Variable 2017
 I&M Notes Payable   5,324 Variable 2016
 I&M Notes Payable   5,214 Variable 2016
 I&M Notes Payable   3,611 2.12 2016
 I&M Other Long-term Debt   2,063 Variable 2015
 I&M Other Long-term Debt   259 6.00 2025
 OPCo Other Long-term Debt   29 1.149 2028
 OPCo Senior Unsecured Notes   225,000 4.85 2014
 PSO Other Long-term Debt   102 3.00 2027
 SWEPCo Notes Payable   1,625 4.58 2032
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
               Net   
               Loans to   
   Maximum Maximum Average Average (Borrowings from) Authorized
   Borrowings Loans  Borrowings Loans  the Utility Short-term
   from the Utility to the Utility from the Utility to the Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool March 31, 2014 Limit
   (in thousands)
 APCo $ - $ 249,630 $ - $ 164,681 $ 245,516 $ 600,000
 I&M   -   158,857   -   92,303   59,162   500,000
 OPCo   55,640   405,350   25,930   135,747   (27,108)   600,000
 PSO   121,100   -   58,500   -   (70,119)   300,000
 SWEPCo   130,258   -   61,132   -   (117,342)   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Three Months Ended March 31,
   2014 2013
 Maximum Interest Rate  0.33%  0.43%
 Minimum Interest Rate  0.28%  0.35%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
   Average Interest Rate  Average Interest Rate
   for Funds Borrowed   for Funds Loaned
   from the Utility Money Pool for   to the Utility Money Pool for
   Three Months Ended March 31, Three Months Ended March 31,
 Company 2014 20132014 2013
 APCo  -%  0.38%  0.31%  0.37%
 I&M  -%  0.36%  0.31%  0.37%
 OPCo  0.31%  0.36%  0.29%  0.37%
 PSO  0.31%  0.36%  -%  0.38%
 SWEPCo  0.31%  -%  -%  0.38%
Accounts Receivable and Accrued Unbilled Revenues
    March 31, December 31,
 Company 2014 2013
    (in thousands)
 APCo $ 175,738 $ 156,599
 I&M   154,510   139,257
 OPCo   350,735   324,287
 PSO   111,522   115,260
 SWEPCo   145,648   149,337
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Three Months Ended March 31,
 Company 2014 2013
    (in thousands)
 APCo $ 2,423 $ 1,556
 I&M   2,040   1,452
 OPCo   7,498   4,669
 PSO   1,323   1,414
 SWEPCo   1,566   1,380
Proceeds on Sale of Receivables to AEP Credit
    Three Months Ended March 31,
 Company 2014 2013
    (in thousands)
 APCo $ 437,196 $ 398,193
 I&M   407,150   351,830
 OPCo   686,627   696,958
 PSO   290,217   240,275
 SWEPCo   390,588   331,936