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Unaudited Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2012
Unaudited Quarterly Financial Information
    2012 Quarterly Periods Ended
    March 31 June 30 September 30 December 31 
    (in millions - except per share amounts) 
Total Revenues$ 3,625 $ 3,551 $ 4,156 $ 3,613 
Operating Income  754   741   912   249(a)(b)
Net Income  390   363   488   21(a)(b)
             
Amounts Attributable to AEP Common Shareholders:            
  Net Income  389   362   487   21(a)(b)
             
Basic Earnings per Share Attributable to AEP            
 Common Shareholders:            
  Earnings per Share (f)  0.80   0.75   1.00   0.05 
             
Diluted Earnings per Share Attributable to AEP            
 Common Shareholders:            
  Earnings per Share (f)  0.80   0.75   1.00   0.05 

    2011 Quarterly Periods Ended
    March 31 June 30 September 30 December 31 
    (in millions - except per share amounts) 
Total Revenues$ 3,730 $ 3,609 $ 4,333 $ 3,444 
Operating Income  832   717   890(c)  343(e)
Income Before Extraordinary Item  355   353   657(c) (d)  211(d) (e)
Extraordinary Item, Net of Tax  -   -   273(d)  100(d)
Net Income  355   353   930(c) (d)  311(d) (e)
             
Amounts Attributable to AEP Common Shareholders:            
  Income Before Extraordinary Item  353   352   655(c) (d)  208(d) (e)
  Extraordinary Item, Net of Tax  -   -   273(d)  100(d)
  Net Income  353   352   928(c) (d)  308(d) (e)
             
Basic Earnings per Share Attributable to AEP            
 Common Shareholders:            
  Earnings per Share Before Extraordinary Item (f)  0.73   0.73   1.35   0.43 
  Extraordinary Item per Share  -   -   0.57   0.20 
  Earnings per Share (f)  0.73   0.73   1.92   0.63 
             
Diluted Earnings per Share Attributable to AEP            
 Common Shareholders:            
  Earnings per Share Before Extraordinary Item (f)  0.73   0.73   1.35   0.43 
  Extraordinary Item per Share  -   -   0.57   0.20 
  Earnings per Share (f)  0.73   0.73   1.92   0.63 

(a)       Includes pretax impairments for certain Ohio generation plants (see Note 6).

(b)       See Note 17 for discussion of cost reduction programs in 2012.

(c)       Includes pretax plant impairments (see Note 6) and a provision for refund of POLR charges in Ohio.

(d)       See "TCC Texas Restructuring" section of Note 2 for discussion of gains recorded in the third and fourth quarters of 2011.

(e)        Includes a refund of POLR charges in Ohio and OPCo adjustments for fuel disallowances, the 2010 SEET and the obligation to contribute to Partnership with Ohio and Ohio Growth Fund. Also includes a pretax plant impairment for SWEPCo's Turk Plant (see Note 6).

(f)       Quarterly Earnings per Share amounts are meant to be stand-alone calculations and are not always additive to full-year amount due to rounding.
Appalachian Power Co [Member]
  
Unaudited Quarterly Financial Information
Quarterly Periods Ended:APCo I&M OPCo PSO SWEPCo 
    (in thousands) 
March 31, 2012               
Total Revenues$ 805,476 $ 546,207 $ 1,237,223 $ 300,531 $ 348,986 
Operating Income  169,190   76,325   269,619   33,490   55,368 
Net Income  75,311   39,221   150,830   12,648   36,395 
                
June 30, 2012               
Total Revenues$ 716,461 $ 510,876 $ 1,113,750 $ 317,311 $ 390,946 
Operating Income  143,426   64,803   210,004   69,299   72,976 
Net Income  62,332   29,810   101,423   35,211   54,902 
                
September 30, 2012               
Total Revenues$ 864,198 $ 598,204 $ 1,359,816 $ 372,872 $ 485,169 
Operating Income  142,722   80,486   279,109   106,196   120,008 
Net Income  63,191   39,254   151,510   58,103   89,218 
                
December 31, 2012               
Total Revenues$ 890,796 $ 544,824 $ 1,217,407 $ 242,224 $ 352,733 
Operating Income (Loss)  142,122   26,080   (81,785)(a)  21,965   27,544 
Net Income (Loss)  56,669   10,172   (60,229)(a)  8,179   21,998 

Quarterly Periods Ended:APCo I&M OPCo PSO SWEPCo 
    (in thousands) 
March 31, 2011               
Total Revenues$ 831,820 $ 560,492 $ 1,394,190 $ 288,003 $ 362,955 
Operating Income  116,061(b)  95,994   299,396   38,881   54,528 
Net Income  38,980(b)  45,427   165,970   15,389   29,827 
                
June 30, 2011               
Total Revenues$ 751,445 $ 521,478 $ 1,285,558 $ 328,588 $ 399,534 
Operating Income  88,567   64,351   261,534   64,185   80,054 
Net Income  31,627   31,386   142,194   31,560   51,071 
                
September 30, 2011               
Total Revenues$ 858,336 $ 611,232 $ 1,540,231 $ 457,586 $ 534,982 
Operating Income  122,716   100,352   210,453(c)  103,006   128,406 
Net Income  52,804   51,702   128,339(c)  57,349   87,795 
                
December 31, 2011               
Total Revenues$ 763,624 $ 521,568 $ 1,211,132 $ 289,211 $ 356,355 
Operating Income (Loss)  102,236(d)  20,959   63,321(e)  34,939   (12,731)(f)
Net Income (Loss)  39,347(d)  21,159   28,490(e)  20,330   (3,567)(f)

(a)       Includes pretax impairments for certain Ohio generation plants (see Note 5).

(b)       Includes a $41 million increase due to the pretax write-off of a portion of the Mountaineer Carbon Capture and Storage Product Validation Facility as denied for recovery by the WVPSC. This increase was partially offset by the $32 million decrease due to the deferral of 2010 costs related to storms and cost reduction initiatives as allowed by the WVPSC.

(c)       Includes pretax plant impairments for the Sporn Unit 5 shutdown and FGD project at Muskingum River Unit 5 (see Note 5). Also includes a $43 million provision for refund of POLR charges.

(d)       Includes a $31 million pretax write-off related to the disallowance of certain Virginia environmental costs incurred in 2009 and 2010 as a result of APCo's November 2011 Virginia SCC order. Includes a $27 million increase due to a favorable Asset Retirement Obligation adjustment related to the early closure and previous write-off of the Mountaineer Carbon Capture and Storage Product Validation Facility.

(e)       Includes provisions related to the FAC, the 2010 SEET and the obligation to contribute to Partnership with Ohio and Ohio Growth Fund.

(f)       Includes a pretax plant impairment for the Turk Plant (see Note 5).
Indiana Michigan Power Co [Member]
  
Unaudited Quarterly Financial Information
Quarterly Periods Ended:APCo I&M OPCo PSO SWEPCo 
    (in thousands) 
March 31, 2012               
Total Revenues$ 805,476 $ 546,207 $ 1,237,223 $ 300,531 $ 348,986 
Operating Income  169,190   76,325   269,619   33,490   55,368 
Net Income  75,311   39,221   150,830   12,648   36,395 
                
June 30, 2012               
Total Revenues$ 716,461 $ 510,876 $ 1,113,750 $ 317,311 $ 390,946 
Operating Income  143,426   64,803   210,004   69,299   72,976 
Net Income  62,332   29,810   101,423   35,211   54,902 
                
September 30, 2012               
Total Revenues$ 864,198 $ 598,204 $ 1,359,816 $ 372,872 $ 485,169 
Operating Income  142,722   80,486   279,109   106,196   120,008 
Net Income  63,191   39,254   151,510   58,103   89,218 
                
December 31, 2012               
Total Revenues$ 890,796 $ 544,824 $ 1,217,407 $ 242,224 $ 352,733 
Operating Income (Loss)  142,122   26,080   (81,785)(a)  21,965   27,544 
Net Income (Loss)  56,669   10,172   (60,229)(a)  8,179   21,998 

Quarterly Periods Ended:APCo I&M OPCo PSO SWEPCo 
    (in thousands) 
March 31, 2011               
Total Revenues$ 831,820 $ 560,492 $ 1,394,190 $ 288,003 $ 362,955 
Operating Income  116,061(b)  95,994   299,396   38,881   54,528 
Net Income  38,980(b)  45,427   165,970   15,389   29,827 
                
June 30, 2011               
Total Revenues$ 751,445 $ 521,478 $ 1,285,558 $ 328,588 $ 399,534 
Operating Income  88,567   64,351   261,534   64,185   80,054 
Net Income  31,627   31,386   142,194   31,560   51,071 
                
September 30, 2011               
Total Revenues$ 858,336 $ 611,232 $ 1,540,231 $ 457,586 $ 534,982 
Operating Income  122,716   100,352   210,453(c)  103,006   128,406 
Net Income  52,804   51,702   128,339(c)  57,349   87,795 
                
December 31, 2011               
Total Revenues$ 763,624 $ 521,568 $ 1,211,132 $ 289,211 $ 356,355 
Operating Income (Loss)  102,236(d)  20,959   63,321(e)  34,939   (12,731)(f)
Net Income (Loss)  39,347(d)  21,159   28,490(e)  20,330   (3,567)(f)

(a)       Includes pretax impairments for certain Ohio generation plants (see Note 5).

(b)       Includes a $41 million increase due to the pretax write-off of a portion of the Mountaineer Carbon Capture and Storage Product Validation Facility as denied for recovery by the WVPSC. This increase was partially offset by the $32 million decrease due to the deferral of 2010 costs related to storms and cost reduction initiatives as allowed by the WVPSC.

(c)       Includes pretax plant impairments for the Sporn Unit 5 shutdown and FGD project at Muskingum River Unit 5 (see Note 5). Also includes a $43 million provision for refund of POLR charges.

(d)       Includes a $31 million pretax write-off related to the disallowance of certain Virginia environmental costs incurred in 2009 and 2010 as a result of APCo's November 2011 Virginia SCC order. Includes a $27 million increase due to a favorable Asset Retirement Obligation adjustment related to the early closure and previous write-off of the Mountaineer Carbon Capture and Storage Product Validation Facility.

(e)       Includes provisions related to the FAC, the 2010 SEET and the obligation to contribute to Partnership with Ohio and Ohio Growth Fund.

(f)       Includes a pretax plant impairment for the Turk Plant (see Note 5).
Ohio Power Co [Member]
  
Unaudited Quarterly Financial Information
Quarterly Periods Ended:APCo I&M OPCo PSO SWEPCo 
    (in thousands) 
March 31, 2012               
Total Revenues$ 805,476 $ 546,207 $ 1,237,223 $ 300,531 $ 348,986 
Operating Income  169,190   76,325   269,619   33,490   55,368 
Net Income  75,311   39,221   150,830   12,648   36,395 
                
June 30, 2012               
Total Revenues$ 716,461 $ 510,876 $ 1,113,750 $ 317,311 $ 390,946 
Operating Income  143,426   64,803   210,004   69,299   72,976 
Net Income  62,332   29,810   101,423   35,211   54,902 
                
September 30, 2012               
Total Revenues$ 864,198 $ 598,204 $ 1,359,816 $ 372,872 $ 485,169 
Operating Income  142,722   80,486   279,109   106,196   120,008 
Net Income  63,191   39,254   151,510   58,103   89,218 
                
December 31, 2012               
Total Revenues$ 890,796 $ 544,824 $ 1,217,407 $ 242,224 $ 352,733 
Operating Income (Loss)  142,122   26,080   (81,785)(a)  21,965   27,544 
Net Income (Loss)  56,669   10,172   (60,229)(a)  8,179   21,998 

Quarterly Periods Ended:APCo I&M OPCo PSO SWEPCo 
    (in thousands) 
March 31, 2011               
Total Revenues$ 831,820 $ 560,492 $ 1,394,190 $ 288,003 $ 362,955 
Operating Income  116,061(b)  95,994   299,396   38,881   54,528 
Net Income  38,980(b)  45,427   165,970   15,389   29,827 
                
June 30, 2011               
Total Revenues$ 751,445 $ 521,478 $ 1,285,558 $ 328,588 $ 399,534 
Operating Income  88,567   64,351   261,534   64,185   80,054 
Net Income  31,627   31,386   142,194   31,560   51,071 
                
September 30, 2011               
Total Revenues$ 858,336 $ 611,232 $ 1,540,231 $ 457,586 $ 534,982 
Operating Income  122,716   100,352   210,453(c)  103,006   128,406 
Net Income  52,804   51,702   128,339(c)  57,349   87,795 
                
December 31, 2011               
Total Revenues$ 763,624 $ 521,568 $ 1,211,132 $ 289,211 $ 356,355 
Operating Income (Loss)  102,236(d)  20,959   63,321(e)  34,939   (12,731)(f)
Net Income (Loss)  39,347(d)  21,159   28,490(e)  20,330   (3,567)(f)

(a)       Includes pretax impairments for certain Ohio generation plants (see Note 5).

(b)       Includes a $41 million increase due to the pretax write-off of a portion of the Mountaineer Carbon Capture and Storage Product Validation Facility as denied for recovery by the WVPSC. This increase was partially offset by the $32 million decrease due to the deferral of 2010 costs related to storms and cost reduction initiatives as allowed by the WVPSC.

(c)       Includes pretax plant impairments for the Sporn Unit 5 shutdown and FGD project at Muskingum River Unit 5 (see Note 5). Also includes a $43 million provision for refund of POLR charges.

(d)       Includes a $31 million pretax write-off related to the disallowance of certain Virginia environmental costs incurred in 2009 and 2010 as a result of APCo's November 2011 Virginia SCC order. Includes a $27 million increase due to a favorable Asset Retirement Obligation adjustment related to the early closure and previous write-off of the Mountaineer Carbon Capture and Storage Product Validation Facility.

(e)       Includes provisions related to the FAC, the 2010 SEET and the obligation to contribute to Partnership with Ohio and Ohio Growth Fund.

(f)       Includes a pretax plant impairment for the Turk Plant (see Note 5).
Public Service Co of Oklahoma [Member]
  
Unaudited Quarterly Financial Information
Quarterly Periods Ended:APCo I&M OPCo PSO SWEPCo 
    (in thousands) 
March 31, 2012               
Total Revenues$ 805,476 $ 546,207 $ 1,237,223 $ 300,531 $ 348,986 
Operating Income  169,190   76,325   269,619   33,490   55,368 
Net Income  75,311   39,221   150,830   12,648   36,395 
                
June 30, 2012               
Total Revenues$ 716,461 $ 510,876 $ 1,113,750 $ 317,311 $ 390,946 
Operating Income  143,426   64,803   210,004   69,299   72,976 
Net Income  62,332   29,810   101,423   35,211   54,902 
                
September 30, 2012               
Total Revenues$ 864,198 $ 598,204 $ 1,359,816 $ 372,872 $ 485,169 
Operating Income  142,722   80,486   279,109   106,196   120,008 
Net Income  63,191   39,254   151,510   58,103   89,218 
                
December 31, 2012               
Total Revenues$ 890,796 $ 544,824 $ 1,217,407 $ 242,224 $ 352,733 
Operating Income (Loss)  142,122   26,080   (81,785)(a)  21,965   27,544 
Net Income (Loss)  56,669   10,172   (60,229)(a)  8,179   21,998 

Quarterly Periods Ended:APCo I&M OPCo PSO SWEPCo 
    (in thousands) 
March 31, 2011               
Total Revenues$ 831,820 $ 560,492 $ 1,394,190 $ 288,003 $ 362,955 
Operating Income  116,061(b)  95,994   299,396   38,881   54,528 
Net Income  38,980(b)  45,427   165,970   15,389   29,827 
                
June 30, 2011               
Total Revenues$ 751,445 $ 521,478 $ 1,285,558 $ 328,588 $ 399,534 
Operating Income  88,567   64,351   261,534   64,185   80,054 
Net Income  31,627   31,386   142,194   31,560   51,071 
                
September 30, 2011               
Total Revenues$ 858,336 $ 611,232 $ 1,540,231 $ 457,586 $ 534,982 
Operating Income  122,716   100,352   210,453(c)  103,006   128,406 
Net Income  52,804   51,702   128,339(c)  57,349   87,795 
                
December 31, 2011               
Total Revenues$ 763,624 $ 521,568 $ 1,211,132 $ 289,211 $ 356,355 
Operating Income (Loss)  102,236(d)  20,959   63,321(e)  34,939   (12,731)(f)
Net Income (Loss)  39,347(d)  21,159   28,490(e)  20,330   (3,567)(f)

(a)       Includes pretax impairments for certain Ohio generation plants (see Note 5).

(b)       Includes a $41 million increase due to the pretax write-off of a portion of the Mountaineer Carbon Capture and Storage Product Validation Facility as denied for recovery by the WVPSC. This increase was partially offset by the $32 million decrease due to the deferral of 2010 costs related to storms and cost reduction initiatives as allowed by the WVPSC.

(c)       Includes pretax plant impairments for the Sporn Unit 5 shutdown and FGD project at Muskingum River Unit 5 (see Note 5). Also includes a $43 million provision for refund of POLR charges.

(d)       Includes a $31 million pretax write-off related to the disallowance of certain Virginia environmental costs incurred in 2009 and 2010 as a result of APCo's November 2011 Virginia SCC order. Includes a $27 million increase due to a favorable Asset Retirement Obligation adjustment related to the early closure and previous write-off of the Mountaineer Carbon Capture and Storage Product Validation Facility.

(e)       Includes provisions related to the FAC, the 2010 SEET and the obligation to contribute to Partnership with Ohio and Ohio Growth Fund.

(f)       Includes a pretax plant impairment for the Turk Plant (see Note 5).
Southwestern Electric Power Co [Member]
  
Unaudited Quarterly Financial Information
Quarterly Periods Ended:APCo I&M OPCo PSO SWEPCo 
    (in thousands) 
March 31, 2012               
Total Revenues$ 805,476 $ 546,207 $ 1,237,223 $ 300,531 $ 348,986 
Operating Income  169,190   76,325   269,619   33,490   55,368 
Net Income  75,311   39,221   150,830   12,648   36,395 
                
June 30, 2012               
Total Revenues$ 716,461 $ 510,876 $ 1,113,750 $ 317,311 $ 390,946 
Operating Income  143,426   64,803   210,004   69,299   72,976 
Net Income  62,332   29,810   101,423   35,211   54,902 
                
September 30, 2012               
Total Revenues$ 864,198 $ 598,204 $ 1,359,816 $ 372,872 $ 485,169 
Operating Income  142,722   80,486   279,109   106,196   120,008 
Net Income  63,191   39,254   151,510   58,103   89,218 
                
December 31, 2012               
Total Revenues$ 890,796 $ 544,824 $ 1,217,407 $ 242,224 $ 352,733 
Operating Income (Loss)  142,122   26,080   (81,785)(a)  21,965   27,544 
Net Income (Loss)  56,669   10,172   (60,229)(a)  8,179   21,998 

Quarterly Periods Ended:APCo I&M OPCo PSO SWEPCo 
    (in thousands) 
March 31, 2011               
Total Revenues$ 831,820 $ 560,492 $ 1,394,190 $ 288,003 $ 362,955 
Operating Income  116,061(b)  95,994   299,396   38,881   54,528 
Net Income  38,980(b)  45,427   165,970   15,389   29,827 
                
June 30, 2011               
Total Revenues$ 751,445 $ 521,478 $ 1,285,558 $ 328,588 $ 399,534 
Operating Income  88,567   64,351   261,534   64,185   80,054 
Net Income  31,627   31,386   142,194   31,560   51,071 
                
September 30, 2011               
Total Revenues$ 858,336 $ 611,232 $ 1,540,231 $ 457,586 $ 534,982 
Operating Income  122,716   100,352   210,453(c)  103,006   128,406 
Net Income  52,804   51,702   128,339(c)  57,349   87,795 
                
December 31, 2011               
Total Revenues$ 763,624 $ 521,568 $ 1,211,132 $ 289,211 $ 356,355 
Operating Income (Loss)  102,236(d)  20,959   63,321(e)  34,939   (12,731)(f)
Net Income (Loss)  39,347(d)  21,159   28,490(e)  20,330   (3,567)(f)

(a)       Includes pretax impairments for certain Ohio generation plants (see Note 5).

(b)       Includes a $41 million increase due to the pretax write-off of a portion of the Mountaineer Carbon Capture and Storage Product Validation Facility as denied for recovery by the WVPSC. This increase was partially offset by the $32 million decrease due to the deferral of 2010 costs related to storms and cost reduction initiatives as allowed by the WVPSC.

(c)       Includes pretax plant impairments for the Sporn Unit 5 shutdown and FGD project at Muskingum River Unit 5 (see Note 5). Also includes a $43 million provision for refund of POLR charges.

(d)       Includes a $31 million pretax write-off related to the disallowance of certain Virginia environmental costs incurred in 2009 and 2010 as a result of APCo's November 2011 Virginia SCC order. Includes a $27 million increase due to a favorable Asset Retirement Obligation adjustment related to the early closure and previous write-off of the Mountaineer Carbon Capture and Storage Product Validation Facility.

(e)       Includes provisions related to the FAC, the 2010 SEET and the obligation to contribute to Partnership with Ohio and Ohio Growth Fund.

(f)       Includes a pretax plant impairment for the Turk Plant (see Note 5).