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Commitments, Guarantees and Contingencies (Tables)
12 Months Ended
Dec. 31, 2012
Contractual Commitments
   Less Than 1     After  
 Contractual Commitments Year 2-3 Years 4-5 Years 5 Years Total
   (in millions)
 Fuel Purchase Contracts (a) $ 2,642 $ 3,928 $ 2,854 $ 2,908 $ 12,332
 Energy and Capacity Purchase Contracts (b)   177   359   368   2,494   3,398
 Construction Contracts for Capital Assets (c)    187   -   -   -   187
 Total $ 3,006 $ 4,287 $ 3,222 $ 5,402 $ 15,917
                  
 (a)Represents contractual commitments to purchase coal, natural gas, uranium and other consumables as fuel for electric generation along with related transportation of the fuel.
 (b)Represents contractual commitments for energy and capacity purchase contracts.
 (c) Represents only capital assets for which we have signed contracts. Actual payments are dependent upon and may vary significantly based upon the decision to build, regulatory approval schedules, timing and escalation of project costs.
Appalachian Power Co [Member]
 
Forecasted Construction Expenditures by Registrant
   Forecasted 
   Construction 
 Company Expenditures 
   (in millions) 
 APCo $ 370 
 I&M    484 
 OPCo   617 
 PSO   295 
 SWEPCo   398 
Contractual Commitments
   Less Than 1     After  
 Contractual Commitments - APCo Year 2-3 Years 4-5 Years 5 Years Total
   (in thousands)
 Fuel Purchase Contracts (a) $ 611,664 $ 711,277 $ 544,598 $ 553,315 $ 2,420,854
 Energy and Capacity Purchase Contracts (b)   32,293   66,034   67,882   586,336   752,545
 Construction Contracts for Capital Assets (c)   13,094   -   -   -   13,094
 Total $ 657,051 $ 777,311 $ 612,480 $ 1,139,651 $ 3,186,493

(a)       Represents contractual commitments to purchase coal, natural gas, uranium and other consumables as fuel for electric generation along with related transportation of the fuel.

(b)       Represents contractual commitments for energy and capacity purchase contracts.

(c)       Represents only capital assets for which there are signed contracts. Actual payments are dependent upon and may vary significantly based upon the decision to build, regulatory approval schedules, timing and escalation of projects costs.

Pollution Control Bonds Supported by Bilateral Letters of Credit
       Bilateral Maturity of
   Pollution  Letters Bilateral Letters
 Company Control Bonds  of Credit of Credit
   (in thousands)  
 APCo $ 229,650 $ 232,293 March 2013 to March 2014
 I&M   77,000   77,886 March 2013
 OPCo   50,000   50,575 March 2013
Indiana Michigan Power Co [Member]
 
Forecasted Construction Expenditures by Registrant
   Forecasted 
   Construction 
 Company Expenditures 
   (in millions) 
 APCo $ 370 
 I&M    484 
 OPCo   617 
 PSO   295 
 SWEPCo   398 
Contractual Commitments
   Less Than 1     After  
 Contractual Commitments - I&M Year 2-3 Years 4-5 Years 5 Years Total
   (in thousands)
 Fuel Purchase Contracts (a) $ 330,157 $ 535,223 $ 336,830 $ 447,930 $ 1,650,140
 Energy and Capacity Purchase Contracts (b)   89,128   178,501   178,543   609,371   1,055,543
 Construction Contracts for Capital Assets (c)    6,389   -   -   -   6,389
 Total $ 425,674 $ 713,724 $ 515,373 $ 1,057,301 $ 2,712,072
                  

(a)       Represents contractual commitments to purchase coal, natural gas, uranium and other consumables as fuel for electric generation along with related transportation of the fuel.

(b)       Represents contractual commitments for energy and capacity purchase contracts.

(c)       Represents only capital assets for which there are signed contracts. Actual payments are dependent upon and may vary significantly based upon the decision to build, regulatory approval schedules, timing and escalation of projects costs.

Maximum Future Payments of Letters of Credit
 Company Amount Maturity
 (in thousands)
 I&M $ 150 March 2013
 OPCo   2,102 June 2013
 SWEPCo   4,448 March 2013
Pollution Control Bonds Supported by Bilateral Letters of Credit
       Bilateral Maturity of
   Pollution  Letters Bilateral Letters
 Company Control Bonds  of Credit of Credit
   (in thousands)  
 APCo $ 229,650 $ 232,293 March 2013 to March 2014
 I&M   77,000   77,886 March 2013
 OPCo   50,000   50,575 March 2013
Ohio Power Co [Member]
 
Forecasted Construction Expenditures by Registrant
   Forecasted 
   Construction 
 Company Expenditures 
   (in millions) 
 APCo $ 370 
 I&M    484 
 OPCo   617 
 PSO   295 
 SWEPCo   398 
Contractual Commitments
   Less Than 1     After  
 Contractual Commitments - OPCo Year 2-3 Years 4-5 Years 5 Years Total
   (in thousands)
 Fuel Purchase Contracts (a) $ 1,167,631 $ 2,012,580 $ 1,542,218 $ 1,368,019 $ 6,090,448
 Energy and Capacity Purchase Contracts (b)   45,009   91,997   94,290   920,573   1,151,869
 Construction Contracts for Capital Assets (c)    22,407   -   -   -   22,407
 Total $ 1,235,047 $ 2,104,577 $ 1,636,508 $ 2,288,592 $ 7,264,724
                  

(a)       Represents contractual commitments to purchase coal, natural gas, uranium and other consumables as fuel for electric generation along with related transportation of the fuel.

(b)       Represents contractual commitments for energy and capacity purchase contracts.

(c)       Represents only capital assets for which there are signed contracts. Actual payments are dependent upon and may vary significantly based upon the decision to build, regulatory approval schedules, timing and escalation of projects costs.

Maximum Future Payments of Letters of Credit
 Company Amount Maturity
 (in thousands)
 I&M $ 150 March 2013
 OPCo   2,102 June 2013
 SWEPCo   4,448 March 2013
Pollution Control Bonds Supported by Bilateral Letters of Credit
       Bilateral Maturity of
   Pollution  Letters Bilateral Letters
 Company Control Bonds  of Credit of Credit
   (in thousands)  
 APCo $ 229,650 $ 232,293 March 2013 to March 2014
 I&M   77,000   77,886 March 2013
 OPCo   50,000   50,575 March 2013
Public Service Co of Oklahoma [Member]
 
Forecasted Construction Expenditures by Registrant
   Forecasted 
   Construction 
 Company Expenditures 
   (in millions) 
 APCo $ 370 
 I&M    484 
 OPCo   617 
 PSO   295 
 SWEPCo   398 
Contractual Commitments
   Less Than 1     After  
 Contractual Commitments - PSO Year 2-3 Years 4-5 Years 5 Years Total
   (in thousands)
 Fuel Purchase Contracts (a) $ 119,855 $ 140,535 $ 113,035 $ 197,788 $ 571,213
 Energy and Capacity Purchase Contracts (b)   69,216   141,389   145,439   528,899   884,943
 Construction Contracts for Capital Assets (c)    9,554   -   -   -   9,554
 Total $ 198,625 $ 281,924 $ 258,474 $ 726,687 $ 1,465,710
                  

(a)       Represents contractual commitments to purchase coal, natural gas, uranium and other consumables as fuel for electric generation along with related transportation of the fuel.

(b)       Represents contractual commitments for energy and capacity purchase contracts.

(c)       Represents only capital assets for which there are signed contracts. Actual payments are dependent upon and may vary significantly based upon the decision to build, regulatory approval schedules, timing and escalation of projects costs.

Southwestern Electric Power Co [Member]
 
Forecasted Construction Expenditures by Registrant
   Forecasted 
   Construction 
 Company Expenditures 
   (in millions) 
 APCo $ 370 
 I&M    484 
 OPCo   617 
 PSO   295 
 SWEPCo   398 
Contractual Commitments
   Less Than 1     After  
 Contractual Commitments - SWEPCo Year 2-3 Years 4-5 Years 5 Years Total
   (in thousands)
 Fuel Purchase Contracts (a) $ 296,426 $ 487,711 $ 316,753 $ 340,969 $ 1,441,859
 Energy and Capacity Purchase Contracts (b)   19,714   39,252   40,656   244,199   343,821
 Construction Contracts for Capital Assets (c)    21,898   -   -   -   21,898
 Total $ 338,038 $ 526,963 $ 357,409 $ 585,168 $ 1,807,578
                  

(a)       Represents contractual commitments to purchase coal, natural gas, uranium and other consumables as fuel for electric generation along with related transportation of the fuel.

(b)       Represents contractual commitments for energy and capacity purchase contracts.

(c)       Represents only capital assets for which there are signed contracts. Actual payments are dependent upon and may vary significantly based upon the decision to build, regulatory approval schedules, timing and escalation of projects costs.

Maximum Future Payments of Letters of Credit
 Company Amount Maturity
 (in thousands)
 I&M $ 150 March 2013
 OPCo   2,102 June 2013
 SWEPCo   4,448 March 2013