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Benefit Plans 3 (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
American Electric Power System Retirement Savings Plans      
Cost of Company Matching Contributions $ 67,000,000 $ 66,000,000 $ 64,000,000
Benefit Plans Textuals [Abstract]      
Cost of Company Matching Contributions 67,000,000 66,000,000 64,000,000
Matching Contributions Provided Percentage 100.00%    
Second Matching Contributions Provided Percentage 70.00%    
Eligible Compensation Contribution by Employee Percentage 1.00%    
Second Eligible Compensation Contribution by Employee Percentage 5.00%    
Multiemployer Plans Withdrawal Obligation 39,000,000    
Regulatory Assets, Noncurrent 4,376,000,000 5,106,000,000  
Appalachian Power Co [Member]
      
American Electric Power System Retirement Savings Plans      
Cost of Company Matching Contributions 7,366,000 7,579,000 7,432,000
Benefit Plans Textuals [Abstract]      
Cost of Company Matching Contributions 7,366,000 7,579,000 7,432,000
Matching Contributions Provided Percentage 100.00%    
Second Matching Contributions Provided Percentage 70.00%    
Eligible Compensation Contribution by Employee Percentage 1.00%    
Second Eligible Compensation Contribution by Employee Percentage 5.00%    
Regulatory Assets, Noncurrent 1,003,890,000 1,435,704,000  
Indiana Michigan Power Co [Member]
      
American Electric Power System Retirement Savings Plans      
Cost of Company Matching Contributions 10,010,000 9,706,000 9,541,000
Benefit Plans Textuals [Abstract]      
Cost of Company Matching Contributions 10,010,000 9,706,000 9,541,000
Matching Contributions Provided Percentage 100.00%    
Second Matching Contributions Provided Percentage 70.00%    
Eligible Compensation Contribution by Employee Percentage 1.00%    
Second Eligible Compensation Contribution by Employee Percentage 5.00%    
Regulatory Assets, Noncurrent 524,114,000 540,019,000  
Ohio Power Co [Member]
      
American Electric Power System Retirement Savings Plans      
Cost of Company Matching Contributions 6,502,000 10,798,000 10,166,000
Benefit Plans Textuals [Abstract]      
Cost of Company Matching Contributions 6,502,000 10,798,000 10,166,000
Matching Contributions Provided Percentage 100.00%    
Second Matching Contributions Provided Percentage 70.00%    
Eligible Compensation Contribution by Employee Percentage 1.00%    
Second Eligible Compensation Contribution by Employee Percentage 5.00%    
Regulatory Assets, Noncurrent 1,378,697,000 1,420,966,000  
Public Service Co of Oklahoma [Member]
      
American Electric Power System Retirement Savings Plans      
Cost of Company Matching Contributions 3,784,000 3,732,000 3,626,000
Benefit Plans Textuals [Abstract]      
Cost of Company Matching Contributions 3,784,000 3,732,000 3,626,000
Matching Contributions Provided Percentage 100.00%    
Second Matching Contributions Provided Percentage 70.00%    
Eligible Compensation Contribution by Employee Percentage 1.00%    
Second Eligible Compensation Contribution by Employee Percentage 5.00%    
Regulatory Assets, Noncurrent 156,690,000 202,328,000  
Southwestern Electric Power Co [Member]
      
American Electric Power System Retirement Savings Plans      
Cost of Company Matching Contributions 4,970,000 4,890,000 4,438,000
Benefit Plans Textuals [Abstract]      
Cost of Company Matching Contributions 4,970,000 4,890,000 4,438,000
Matching Contributions Provided Percentage 100.00%    
Second Matching Contributions Provided Percentage 70.00%    
Eligible Compensation Contribution by Employee Percentage 1.00%    
Second Eligible Compensation Contribution by Employee Percentage 5.00%    
Regulatory Assets, Noncurrent 369,905,000 403,278,000  
UMWA Withdrawal Obligation [Member]
      
Benefit Plans Textuals [Abstract]      
Regulatory Assets, Noncurrent 30,000,000    
Pension Plans [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 4,715,000,000 5,083,000,000  
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 4,841,000,000 5,205,000,000 4,991,000,000
Accumulated Benefit Obligation 4,715,000,000 5,083,000,000  
Fair Value of Plan Assets 4,711,000,000 4,696,000,000 4,303,000,000
Underfunded Status, Accumulated Benefit Obligation (4,000,000) (387,000,000)  
Estimated Future Benefit Payments and Contributions      
Expected Contributions and Payments During 2014 80,000,000    
Components of Net Periodic Benefit Cost      
Service Cost 69,000,000 76,000,000 72,000,000
Interest Cost 203,000,000 223,000,000 237,000,000
Expected Return on Plan Assets (278,000,000) (319,000,000) (314,000,000)
Curtailment 0 0 0
Amortization of Transition Obligation 0 0 0
Amortization of Prior Service Cost (Credit) 3,000,000 (1,000,000) 1,000,000
Amortization of Net Actuarial Loss 183,000,000 155,000,000 122,000,000
Net Periodic Benefit Cost (Credit) 180,000,000 134,000,000 118,000,000
Capitalized Portion (56,000,000) (42,000,000) (37,000,000)
Net Periodic Benefit Cost (Credit) Recognized in Expense 124,000,000 92,000,000 81,000,000
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Net Actuarial Loss 125,000,000    
Prior Service Cost (Credit) 2,000,000    
Total Estimated 2014 Amortization 127,000,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 127,000,000    
Benefit Plans Textuals [Abstract]      
Expected Contributions and Payments During 2014 80,000,000    
Pension Plans [Member] | Appalachian Power Co [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 654,168,000 708,667,000  
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 663,231,000 718,460,000 681,450,000
Accumulated Benefit Obligation 654,168,000 708,667,000  
Fair Value of Plan Assets 627,995,000 621,570,000 570,756,000
Underfunded Status, Accumulated Benefit Obligation (26,173,000) (87,097,000)  
Estimated Future Benefit Payments and Contributions      
Expected Contributions and Payments During 2014 12,231,000    
Components of Net Periodic Benefit Cost      
Service Cost 6,171,000 7,565,000 7,199,000
Interest Cost 27,662,000 30,211,000 32,293,000
Expected Return on Plan Assets (37,041,000) (41,944,000) (41,833,000)
Amortization of Transition Obligation 0 0 0
Amortization of Prior Service Cost (Credit) 198,000 475,000 917,000
Amortization of Net Actuarial Loss 25,025,000 20,339,000 16,570,000
Net Periodic Benefit Cost (Credit) 22,015,000 16,646,000 15,146,000
Capitalized Portion (7,529,000) (6,525,000) (5,604,000)
Net Periodic Benefit Cost (Credit) Recognized in Expense 14,486,000 10,121,000 9,542,000
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Net Actuarial Loss 16,971,000    
Prior Service Cost (Credit) 198,000    
Total Estimated 2014 Amortization 17,169,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 17,169,000    
Benefit Plans Textuals [Abstract]      
Expected Contributions and Payments During 2014 12,231,000    
Pension Plans [Member] | Indiana Michigan Power Co [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 560,769,000 603,648,000  
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 574,699,000 618,973,000 581,677,000
Accumulated Benefit Obligation 560,769,000 603,648,000  
Fair Value of Plan Assets 559,143,000 552,026,000 503,926,000
Underfunded Status, Accumulated Benefit Obligation (1,626,000) (51,622,000)  
Estimated Future Benefit Payments and Contributions      
Expected Contributions and Payments During 2014 7,339,000    
Components of Net Periodic Benefit Cost      
Service Cost 8,736,000 9,908,000 9,447,000
Interest Cost 24,100,000 26,245,000 27,726,000
Expected Return on Plan Assets (32,826,000) (37,566,000) (36,856,000)
Amortization of Transition Obligation 0 0 0
Amortization of Prior Service Cost (Credit) 195,000 407,000 744,000
Amortization of Net Actuarial Loss 21,688,000 17,569,000 14,144,000
Net Periodic Benefit Cost (Credit) 21,893,000 16,563,000 15,205,000
Capitalized Portion (4,576,000) (3,114,000) (3,163,000)
Net Periodic Benefit Cost (Credit) Recognized in Expense 17,317,000 13,449,000 12,042,000
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Net Actuarial Loss 14,708,000    
Prior Service Cost (Credit) 195,000    
Total Estimated 2014 Amortization 14,903,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 14,903,000    
Benefit Plans Textuals [Abstract]      
Expected Contributions and Payments During 2014 7,339,000    
Pension Plans [Member] | Ohio Power Co [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 512,804,000 1,049,592,000  
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 523,643,000 1,068,186,000 1,020,890,000
Accumulated Benefit Obligation 512,804,000 1,049,592,000  
Fair Value of Plan Assets 501,634,000 1,015,115,000 925,939,000
Underfunded Status, Accumulated Benefit Obligation (11,170,000) (34,477,000)  
Estimated Future Benefit Payments and Contributions      
Expected Contributions and Payments During 2014 8,717,000    
Components of Net Periodic Benefit Cost      
Service Cost 5,285,000 11,003,000 10,230,000
Interest Cost 21,939,000 45,194,000 48,350,000
Expected Return on Plan Assets (29,919,000) (68,401,000) (65,464,000)
Curtailment 0 0 0
Amortization of Transition Obligation 0 0 0
Amortization of Prior Service Cost (Credit) 157,000 743,000 1,474,000
Amortization of Net Actuarial Loss 19,833,000 30,439,000 24,828,000
Net Periodic Benefit Cost (Credit) 17,295,000 18,978,000 19,418,000
Capitalized Portion (6,192,000) (7,060,000) (6,932,000)
Net Periodic Benefit Cost (Credit) Recognized in Expense 11,103,000 11,918,000 12,486,000
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Net Actuarial Loss 13,398,000    
Prior Service Cost (Credit) 157,000    
Total Estimated 2014 Amortization 13,555,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 13,555,000    
Benefit Plans Textuals [Abstract]      
Expected Contributions and Payments During 2014 8,717,000    
Pension Plans [Member] | Public Service Co of Oklahoma [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 249,859,000 271,025,000  
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 260,710,000 279,685,000 277,448,000
Accumulated Benefit Obligation 249,859,000 271,025,000  
Fair Value of Plan Assets 264,597,000 264,823,000 245,769,000
Underfunded Status, Accumulated Benefit Obligation (1,387,000) (6,202,000)  
Estimated Future Benefit Payments and Contributions      
Expected Contributions and Payments During 2014 3,530,000    
Components of Net Periodic Benefit Cost      
Service Cost 5,562,000 5,951,000 5,760,000
Interest Cost 10,993,000 12,301,000 13,285,000
Expected Return on Plan Assets (15,675,000) (18,015,000) (17,464,000)
Amortization of Prior Service Cost (Credit) 297,000 (948,000) (950,000)
Amortization of Net Actuarial Loss 9,845,000 8,206,000 6,757,000
Net Periodic Benefit Cost (Credit) 11,022,000 7,495,000 7,388,000
Capitalized Portion (3,384,000) (2,533,000) (2,379,000)
Net Periodic Benefit Cost (Credit) Recognized in Expense 7,638,000 4,962,000 5,009,000
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Net Actuarial Loss 6,682,000    
Prior Service Cost (Credit) 296,000    
Total Estimated 2014 Amortization 6,978,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 6,978,000    
Benefit Plans Textuals [Abstract]      
Expected Contributions and Payments During 2014 3,530,000    
Pension Plans [Member] | Southwestern Electric Power Co [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 257,198,000 274,958,000  
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 270,564,000 285,560,000 277,594,000
Accumulated Benefit Obligation 257,198,000 274,958,000  
Fair Value of Plan Assets 278,946,000 279,699,000 255,861,000
Underfunded Status, Accumulated Benefit Obligation (1,115,000) (1,098,000)  
Estimated Future Benefit Payments and Contributions      
Expected Contributions and Payments During 2014 1,296,000    
Components of Net Periodic Benefit Cost      
Service Cost 7,011,000 7,099,000 6,573,000
Interest Cost 11,454,000 12,537,000 13,331,000
Expected Return on Plan Assets (16,509,000) (18,866,000) (18,380,000)
Amortization of Prior Service Cost (Credit) 349,000 (793,000) (795,000)
Amortization of Net Actuarial Loss 10,214,000 8,330,000 6,759,000
Net Periodic Benefit Cost (Credit) 12,519,000 8,307,000 7,488,000
Capitalized Portion (3,518,000) (2,924,000) (2,636,000)
Net Periodic Benefit Cost (Credit) Recognized in Expense 9,001,000 5,383,000 4,852,000
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Net Actuarial Loss 6,932,000    
Prior Service Cost (Credit) 349,000    
Total Estimated 2014 Amortization 7,281,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 7,281,000    
Benefit Plans Textuals [Abstract]      
Expected Contributions and Payments During 2014 1,296,000    
Pension Plans [Member] | Pension Payments [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 355,000,000    
2015 363,000,000    
2016 368,000,000    
2017 372,000,000    
2018 377,000,000    
Years 2019 to 2023, in Total 1,857,000,000    
Pension Plans [Member] | Pension Payments [Member] | Appalachian Power Co [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 48,130,000    
2015 48,537,000    
2016 49,024,000    
2017 49,432,000    
2018 50,990,000    
Years 2019 to 2023, in Total 248,890,000    
Pension Plans [Member] | Pension Payments [Member] | Indiana Michigan Power Co [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 37,708,000    
2015 38,835,000    
2016 39,293,000    
2017 40,929,000    
2018 41,453,000    
Years 2019 to 2023, in Total 218,392,000    
Pension Plans [Member] | Pension Payments [Member] | Ohio Power Co [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 40,701,000    
2015 40,772,000    
2016 40,857,000    
2017 40,655,000    
2018 40,225,000    
Years 2019 to 2023, in Total 196,692,000    
Pension Plans [Member] | Pension Payments [Member] | Public Service Co of Oklahoma [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 22,353,000    
2015 22,786,000    
2016 23,234,000    
2017 22,859,000    
2018 23,705,000    
Years 2019 to 2023, in Total 108,884,000    
Pension Plans [Member] | Pension Payments [Member] | Southwestern Electric Power Co [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 23,013,000    
2015 23,830,000    
2016 23,751,000    
2017 23,929,000    
2018 24,658,000    
Years 2019 to 2023, in Total 116,545,000    
Other Postretirement Benefit Plans [Member]
      
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 1,456,000,000 1,849,000,000 2,227,000,000
Fair Value of Plan Assets 1,699,000,000 1,568,000,000 1,410,000,000
Estimated Future Benefit Payments and Contributions      
Expected Contributions and Payments During 2014 6,000,000    
Components of Net Periodic Benefit Cost      
Service Cost 23,000,000 47,000,000 42,000,000
Interest Cost 71,000,000 103,000,000 109,000,000
Expected Return on Plan Assets (107,000,000) (101,000,000) (109,000,000)
Curtailment 0 0 1,000,000
Amortization of Transition Obligation 0 1,000,000 2,000,000
Amortization of Prior Service Cost (Credit) (69,000,000) (18,000,000) (1,000,000)
Amortization of Net Actuarial Loss 65,000,000 57,000,000 29,000,000
Net Periodic Benefit Cost (Credit) (17,000,000) 89,000,000 73,000,000
Capitalized Portion 5,000,000 (28,000,000) (22,000,000)
Net Periodic Benefit Cost (Credit) Recognized in Expense (12,000,000) 61,000,000 51,000,000
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Net Actuarial Loss 21,000,000    
Prior Service Cost (Credit) (69,000,000)    
Total Estimated 2014 Amortization (48,000,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (48,000,000)    
Benefit Plans Textuals [Abstract]      
Expected Contributions and Payments During 2014 6,000,000    
Other Postretirement Benefit Plans [Member] | Appalachian Power Co [Member]
      
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 279,884,000 348,990,000 395,482,000
Fair Value of Plan Assets 284,840,000 267,758,000 229,735,000
Estimated Future Benefit Payments and Contributions      
Expected Contributions and Payments During 2014 3,222,000    
Components of Net Periodic Benefit Cost      
Service Cost 2,566,000 5,387,000 4,983,000
Interest Cost 13,454,000 18,462,000 19,468,000
Expected Return on Plan Assets (18,147,000) (16,753,000) (17,985,000)
Amortization of Transition Obligation 0 780,000 1,167,000
Amortization of Prior Service Cost (Credit) (10,050,000) (2,862,000) (171,000)
Amortization of Net Actuarial Loss 12,249,000 10,526,000 5,839,000
Net Periodic Benefit Cost (Credit) 72,000 15,540,000 13,301,000
Capitalized Portion (25,000) (6,092,000) (4,921,000)
Net Periodic Benefit Cost (Credit) Recognized in Expense 47,000 9,448,000 8,380,000
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Net Actuarial Loss 4,339,000    
Prior Service Cost (Credit) (10,050,000)    
Total Estimated 2014 Amortization (5,711,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (5,711,000)    
Benefit Plans Textuals [Abstract]      
Expected Contributions and Payments During 2014 3,222,000    
Other Postretirement Benefit Plans [Member] | Indiana Michigan Power Co [Member]
      
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 166,497,000 218,553,000 277,353,000
Fair Value of Plan Assets 206,214,000 194,128,000 181,237,000
Estimated Future Benefit Payments and Contributions      
Expected Contributions and Payments During 2014 0    
Components of Net Periodic Benefit Cost      
Service Cost 3,219,000 6,621,000 6,119,000
Interest Cost 8,221,000 12,785,000 13,610,000
Expected Return on Plan Assets (13,183,000) (12,847,000) (13,886,000)
Amortization of Transition Obligation 0 132,000 188,000
Amortization of Prior Service Cost (Credit) (9,421,000) (2,383,000) (237,000)
Amortization of Net Actuarial Loss 7,526,000 7,050,000 3,566,000
Net Periodic Benefit Cost (Credit) (3,638,000) 11,358,000 9,360,000
Capitalized Portion 760,000 (2,135,000) (1,947,000)
Net Periodic Benefit Cost (Credit) Recognized in Expense (2,878,000) 9,223,000 7,413,000
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Net Actuarial Loss 2,341,000    
Prior Service Cost (Credit) (9,421,000)    
Total Estimated 2014 Amortization (7,080,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (7,080,000)    
Benefit Plans Textuals [Abstract]      
Expected Contributions and Payments During 2014 0    
Other Postretirement Benefit Plans [Member] | Ohio Power Co [Member]
      
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 171,164,000 466,290,000 519,892,000
Fair Value of Plan Assets 211,994,000 366,301,000 311,836,000
Estimated Future Benefit Payments and Contributions      
Expected Contributions and Payments During 2014 0    
Components of Net Periodic Benefit Cost      
Service Cost 2,882,000 8,748,000 7,827,000
Interest Cost 9,494,000 24,189,000 25,497,000
Expected Return on Plan Assets (13,468,000) (22,555,000) (24,514,000)
Curtailment 0 0 605,000
Amortization of Transition Obligation 0 104,000 150,000
Amortization of Prior Service Cost (Credit) (6,962,000) (3,873,000) (212,000)
Amortization of Net Actuarial Loss 8,633,000 13,669,000 7,298,000
Net Periodic Benefit Cost (Credit) 579,000 20,282,000 16,651,000
Capitalized Portion (207,000) (7,545,000) (5,944,000)
Net Periodic Benefit Cost (Credit) Recognized in Expense 372,000 12,737,000 10,707,000
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Net Actuarial Loss 2,406,000    
Prior Service Cost (Credit) (6,922,000)    
Total Estimated 2014 Amortization (4,516,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (4,516,000)    
Benefit Plans Textuals [Abstract]      
Expected Contributions and Payments During 2014 0    
Other Postretirement Benefit Plans [Member] | Public Service Co of Oklahoma [Member]
      
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 77,779,000 99,680,000 125,164,000
Fair Value of Plan Assets 96,333,000 90,521,000 83,090,000
Estimated Future Benefit Payments and Contributions      
Expected Contributions and Payments During 2014 0    
Components of Net Periodic Benefit Cost      
Service Cost 1,372,000 2,836,000 2,621,000
Interest Cost 3,793,000 5,797,000 6,046,000
Expected Return on Plan Assets (6,089,000) (5,922,000) (6,264,000)
Amortization of Prior Service Cost (Credit) (4,289,000) (1,079,000) (75,000)
Amortization of Net Actuarial Loss 3,476,000 3,189,000 1,553,000
Net Periodic Benefit Cost (Credit) (1,737,000) 4,821,000 3,881,000
Capitalized Portion 533,000 (1,629,000) (1,249,000)
Net Periodic Benefit Cost (Credit) Recognized in Expense (1,204,000) 3,192,000 2,632,000
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Net Actuarial Loss 1,094,000    
Prior Service Cost (Credit) (4,290,000)    
Total Estimated 2014 Amortization (3,196,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (3,196,000)    
Benefit Plans Textuals [Abstract]      
Expected Contributions and Payments During 2014 0    
Other Postretirement Benefit Plans [Member] | Southwestern Electric Power Co [Member]
      
Underfunded Accumulated Benefit Obligation      
Projected Benefit Obligation 86,997,000 109,948,000 145,160,000
Fair Value of Plan Assets 107,750,000 99,846,000 96,364,000
Estimated Future Benefit Payments and Contributions      
Expected Contributions and Payments During 2014 0    
Components of Net Periodic Benefit Cost      
Service Cost 1,693,000 3,324,000 3,029,000
Interest Cost 4,301,000 6,673,000 6,969,000
Expected Return on Plan Assets (6,881,000) (6,795,000) (7,200,000)
Amortization of Prior Service Cost (Credit) (5,156,000) (933,000) 258,000
Amortization of Net Actuarial Loss 3,928,000 3,659,000 1,785,000
Net Periodic Benefit Cost (Credit) (2,115,000) 5,928,000 4,841,000
Capitalized Portion 594,000 (2,087,000) (1,704,000)
Net Periodic Benefit Cost (Credit) Recognized in Expense (1,521,000) 3,841,000 3,137,000
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Net Actuarial Loss 1,223,000    
Prior Service Cost (Credit) (5,156,000)    
Total Estimated 2014 Amortization (3,933,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (3,933,000)    
Benefit Plans Textuals [Abstract]      
Expected Contributions and Payments During 2014 0    
Other Postretirement Benefit Plans [Member] | Medicare Subsidy Receipts [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 0    
2015 0    
2016 0    
2017 0    
2018 0    
Years 2019 to 2023, in Total 2,000,000    
Other Postretirement Benefit Plans [Member] | Medicare Subsidy Receipts [Member] | Appalachian Power Co [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 252,000    
2015 260,000    
2016 268,000    
2017 271,000    
2018 272,000    
Years 2019 to 2023, in Total 1,378,000    
Other Postretirement Benefit Plans [Member] | Medicare Subsidy Receipts [Member] | Indiana Michigan Power Co [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 0    
2015 0    
2016 0    
2017 0    
2018 0    
Years 2019 to 2023, in Total 0    
Other Postretirement Benefit Plans [Member] | Medicare Subsidy Receipts [Member] | Ohio Power Co [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 0    
2015 0    
2016 0    
2017 0    
2018 0    
Years 2019 to 2023, in Total 0    
Other Postretirement Benefit Plans [Member] | Medicare Subsidy Receipts [Member] | Public Service Co of Oklahoma [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 0    
2015 0    
2016 0    
2017 0    
2018 0    
Years 2019 to 2023, in Total 0    
Other Postretirement Benefit Plans [Member] | Medicare Subsidy Receipts [Member] | Southwestern Electric Power Co [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 0    
2015 0    
2016 0    
2017 0    
2018 0    
Years 2019 to 2023, in Total 0    
Other Postretirement Benefit Plans [Member] | Benefit Payments [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 140,000,000    
2015 145,000,000    
2016 149,000,000    
2017 152,000,000    
2018 156,000,000    
Years 2019 to 2023, in Total 809,000,000    
Other Postretirement Benefit Plans [Member] | Benefit Payments [Member] | Appalachian Power Co [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 26,823,000    
2015 27,438,000    
2016 27,976,000    
2017 28,234,000    
2018 28,884,000    
Years 2019 to 2023, in Total 144,245,000    
Other Postretirement Benefit Plans [Member] | Benefit Payments [Member] | Indiana Michigan Power Co [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 16,665,000    
2015 17,533,000    
2016 18,350,000    
2017 18,794,000    
2018 19,124,000    
Years 2019 to 2023, in Total 101,425,000    
Other Postretirement Benefit Plans [Member] | Benefit Payments [Member] | Ohio Power Co [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 18,026,000    
2015 18,368,000    
2016 18,622,000    
2017 18,708,000    
2018 18,957,000    
Years 2019 to 2023, in Total 95,926,000    
Other Postretirement Benefit Plans [Member] | Benefit Payments [Member] | Public Service Co of Oklahoma [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 7,737,000    
2015 8,114,000    
2016 8,380,000    
2017 8,522,000    
2018 8,609,000    
Years 2019 to 2023, in Total 45,916,000    
Other Postretirement Benefit Plans [Member] | Benefit Payments [Member] | Southwestern Electric Power Co [Member]
      
Estimated Future Benefit Payments and Contributions      
2014 8,343,000    
2015 8,709,000    
2016 9,098,000    
2017 9,417,000    
2018 9,718,000    
Years 2019 to 2023, in Total 52,406,000    
Qualified Pension Plans [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 4,638,000,000 5,001,000,000  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 4,638,000,000 5,001,000,000  
Qualified Pension Plans [Member] | Appalachian Power Co [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 653,968,000 708,476,000  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 653,968,000 708,476,000  
Qualified Pension Plans [Member] | Indiana Michigan Power Co [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 560,443,000 603,448,000  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 560,443,000 603,448,000  
Qualified Pension Plans [Member] | Ohio Power Co [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 512,798,000 1,048,796,000  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 512,798,000 1,048,796,000  
Qualified Pension Plans [Member] | Public Service Co of Oklahoma [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 248,472,000 269,738,000  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 248,472,000 269,738,000  
Qualified Pension Plans [Member] | Southwestern Electric Power Co [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 256,083,000 273,860,000  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 256,083,000 273,860,000  
Nonqualified Pension Plans [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 77,000,000 82,000,000  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 77,000,000 82,000,000  
Nonqualified Pension Plans [Member] | Appalachian Power Co [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 200,000 191,000  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 200,000 191,000  
Nonqualified Pension Plans [Member] | Indiana Michigan Power Co [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 326,000 200,000  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 326,000 200,000  
Nonqualified Pension Plans [Member] | Ohio Power Co [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 6,000 796,000  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 6,000 796,000  
Nonqualified Pension Plans [Member] | Public Service Co of Oklahoma [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 1,387,000 1,287,000  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 1,387,000 1,287,000  
Fair Value of Plan Assets 0    
Underfunded Status, Accumulated Benefit Obligation (1,387,000)    
Nonqualified Pension Plans [Member] | Southwestern Electric Power Co [Member]
      
Accumulated Benefit Obligation      
Accumulated Benefit Obligation 1,115,000 1,098,000  
Underfunded Accumulated Benefit Obligation      
Accumulated Benefit Obligation 1,115,000 1,098,000  
Fair Value of Plan Assets 0 0  
Underfunded Status, Accumulated Benefit Obligation (1,115,000) (1,098,000)  
Net of Tax AOCI [Member] | Pension Plans [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 13,000,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 13,000,000    
Net of Tax AOCI [Member] | Pension Plans [Member] | Appalachian Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 61,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 61,000    
Net of Tax AOCI [Member] | Pension Plans [Member] | Indiana Michigan Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 580,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 580,000    
Net of Tax AOCI [Member] | Pension Plans [Member] | Ohio Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 0    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 0    
Net of Tax AOCI [Member] | Pension Plans [Member] | Public Service Co of Oklahoma [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 0    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 0    
Net of Tax AOCI [Member] | Pension Plans [Member] | Southwestern Electric Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 0    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 0    
Net of Tax AOCI [Member] | Other Postretirement Benefit Plans [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (9,000,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (9,000,000)    
Net of Tax AOCI [Member] | Other Postretirement Benefit Plans [Member] | Appalachian Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (1,539,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (1,539,000)    
Net of Tax AOCI [Member] | Other Postretirement Benefit Plans [Member] | Indiana Michigan Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (412,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (412,000)    
Net of Tax AOCI [Member] | Other Postretirement Benefit Plans [Member] | Ohio Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 0    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 0    
Net of Tax AOCI [Member] | Other Postretirement Benefit Plans [Member] | Public Service Co of Oklahoma [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 0    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 0    
Net of Tax AOCI [Member] | Other Postretirement Benefit Plans [Member] | Southwestern Electric Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (941,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (941,000)    
Deferred Income Taxes [Member] | Pension Plans [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 7,000,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 7,000,000    
Deferred Income Taxes [Member] | Pension Plans [Member] | Appalachian Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 33,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 33,000    
Deferred Income Taxes [Member] | Pension Plans [Member] | Indiana Michigan Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 313,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 313,000    
Deferred Income Taxes [Member] | Pension Plans [Member] | Ohio Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 0    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 0    
Deferred Income Taxes [Member] | Pension Plans [Member] | Public Service Co of Oklahoma [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 0    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 0    
Deferred Income Taxes [Member] | Pension Plans [Member] | Southwestern Electric Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 0    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 0    
Deferred Income Taxes [Member] | Other Postretirement Benefit Plans [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (5,000,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (5,000,000)    
Deferred Income Taxes [Member] | Other Postretirement Benefit Plans [Member] | Appalachian Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (828,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (828,000)    
Deferred Income Taxes [Member] | Other Postretirement Benefit Plans [Member] | Indiana Michigan Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (222,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (222,000)    
Deferred Income Taxes [Member] | Other Postretirement Benefit Plans [Member] | Ohio Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 0    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 0    
Deferred Income Taxes [Member] | Other Postretirement Benefit Plans [Member] | Public Service Co of Oklahoma [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 0    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 0    
Deferred Income Taxes [Member] | Other Postretirement Benefit Plans [Member] | Southwestern Electric Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (507,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (507,000)    
Regulatory Assets [Member] | Pension Plans [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 107,000,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 107,000,000    
Regulatory Assets [Member] | Pension Plans [Member] | Appalachian Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 17,075,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 17,075,000    
Regulatory Assets [Member] | Pension Plans [Member] | Indiana Michigan Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 14,010,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 14,010,000    
Regulatory Assets [Member] | Pension Plans [Member] | Ohio Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 13,555,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 13,555,000    
Regulatory Assets [Member] | Pension Plans [Member] | Public Service Co of Oklahoma [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 6,978,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 6,978,000    
Regulatory Assets [Member] | Pension Plans [Member] | Southwestern Electric Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization 7,281,000    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 7,281,000    
Regulatory Assets [Member] | Other Postretirement Benefit Plans [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (34,000,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (34,000,000)    
Regulatory Assets [Member] | Other Postretirement Benefit Plans [Member] | Appalachian Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (3,344,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (3,344,000)    
Regulatory Assets [Member] | Other Postretirement Benefit Plans [Member] | Indiana Michigan Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (6,446,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (6,446,000)    
Regulatory Assets [Member] | Other Postretirement Benefit Plans [Member] | Ohio Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (4,516,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (4,516,000)    
Regulatory Assets [Member] | Other Postretirement Benefit Plans [Member] | Public Service Co of Oklahoma [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (3,196,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 (3,196,000)    
Regulatory Assets [Member] | Other Postretirement Benefit Plans [Member] | Southwestern Electric Power Co [Member]
      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014      
Total Estimated 2014 Amortization (2,485,000)    
Expected to be Recorded as      
Estimated Amounts Expected to be Amortized to Net Periodic Benefit Costs in 2014 $ (2,485,000)