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Derivatives and Hedging (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
gal
MMBTU
MWh
T
Jun. 30, 2011
Jun. 30, 2012
gal
MMBTU
MWh
T
Jun. 30, 2011
Dec. 31, 2011
MWh
MMBTU
gal
T
Commodity:          
Power (In MWHs) 704,000,000   704,000,000   609,000,000
Coal (In Tons) 16,000,000   16,000,000   21,000,000
Natural Gas (In MMBtus) 115,000,000   115,000,000   100,000,000
Heating Oil and Gasoline (In Gallons) 4,000,000   4,000,000   6,000,000
Interest Rate $ 296,000,000   $ 296,000,000   $ 226,000,000
Interest Rate and Foreign Currency 803,000,000   803,000,000   907,000,000
Cash Collateral Netting          
Cash Collateral Received Netted Against Risk Management Assets 18,000,000   18,000,000   26,000,000
Cash Collateral Paid Netted Against Risk Management Liabilities 94,000,000   94,000,000   133,000,000
Fair Value of Derivative Instruments          
Current Risk Management Assets 219,000,000   219,000,000   193,000,000
Long-term Risk Management Assets 439,000,000   439,000,000   403,000,000
Total Assets 658,000,000   658,000,000   596,000,000
Current Risk Management Liabilities 165,000,000   165,000,000   150,000,000
Long-term Risk Management Liabilities 259,000,000   259,000,000   195,000,000
Total Liabilities 424,000,000   424,000,000   345,000,000
Total MTM Derivative Contract Net Assets (Liabilities) 234,000,000   234,000,000   251,000,000
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 5,000,000 31,000,000 11,000,000 63,000,000  
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI (34,000,000) 12,000,000 (23,000,000) 11,000,000 11,000,000
Changes in Fair Value Recognized in AOCI (16,000,000) 3,000,000 (35,000,000) 4,000,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (44,000,000) 17,000,000 (44,000,000) 17,000,000 (23,000,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 38,000,000 [1]   38,000,000 [1]   20,000,000 [1]
Hedging Liabilities 95,000,000 [1]   95,000,000 [1]   67,000,000 [1]
AOCI Gain (Loss) Net of Tax (44,000,000) 17,000,000 (44,000,000) 17,000,000 (23,000,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     (13,000,000)   (5,000,000)
Maximum Term for Exposure to Variability of Future Cash Flows (in months)     39    
Collateral Triggering Events [Abstract]          
Liabilities for Derivative Contracts with Credit Downgrade Triggers 7,000,000   7,000,000   32,000,000
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post 35,000,000   35,000,000   39,000,000
Amount Attributable to RTO and ISO Activities 33,000,000   33,000,000   38,000,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractural Netting Arrangements 658,000,000   658,000,000   515,000,000
Posted Cash Collateral Related to Contracts with Cross Default Provisions 10,000,000   10,000,000   56,000,000
Additional Settlement Liability if Cross Default Provision is Triggered 375,000,000   375,000,000   291,000,000
Derivatives and Hedging (Textuals) [Abstract]          
Cash Collateral Received Netted Against Risk Management Assets 18,000,000   18,000,000   26,000,000
Cash Collateral Paid Netted Against Risk Management Liabilities 94,000,000   94,000,000   133,000,000
Maximum Term for Exposure to Variability of Future Cash Flows (in months)     39    
Gain on Fair Value Hedging Instrument 1,000,000 4,000,000 2,000,000 8,000,000  
Loss on Fair Value Portion of Long Term Debt 1,000,000 5,000,000 2,000,000 9,000,000  
Appalachian Power Co [Member]
          
Commodity:          
Power (In MWHs) 179,238,000   179,238,000   169,459,000
Coal (In Tons) 2,745,000   2,745,000   3,714,000
Natural Gas (In MMBtus) 12,501,000   12,501,000   7,923,000
Heating Oil and Gasoline (In Gallons) 667,000   667,000   1,057,000
Interest Rate 36,230,000   36,230,000   31,029,000
Interest Rate and Foreign Currency 0   0   0
Cash Collateral Netting          
Cash Collateral Received Netted Against Risk Management Assets 2,664,000   2,664,000   4,291,000
Cash Collateral Paid Netted Against Risk Management Liabilities 19,667,000   19,667,000   28,964,000
Fair Value of Derivative Instruments          
Current Risk Management Assets 41,841,000   41,841,000   39,645,000
Long-term Risk Management Assets 44,676,000   44,676,000   39,226,000
Total Assets 86,517,000   86,517,000   78,871,000
Current Risk Management Liabilities 23,036,000   23,036,000   26,606,000
Long-term Risk Management Liabilities 22,638,000   22,638,000   12,923,000
Total Liabilities 45,674,000   45,674,000   39,529,000
Total MTM Derivative Contract Net Assets (Liabilities) 40,843,000   40,843,000   39,342,000
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 316,000 4,888,000 2,917,000 13,851,000  
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI (824,000) 455,000 (285,000) (56,000) (56,000)
Changes in Fair Value Recognized in AOCI (403,000) (55,000) (2,248,000) (250,000)  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (258,000) 1,155,000 (258,000) 1,155,000  
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
AOCI Gain (Loss) Net of Tax (258,000) 1,155,000 (258,000) 1,155,000  
Maximum Term for Exposure to Variability of Future Cash Flows (in months)      23    
Collateral Triggering Events [Abstract]          
Liabilities for Derivative Contracts with Credit Downgrade Triggers 1,929,000   1,929,000   10,007,000
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post 2,664,000   2,664,000   6,211,000
Amount Attributable to RTO and ISO Activities 2,664,000   2,664,000   6,211,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractural Netting Arrangements 92,276,000   92,276,000   76,868,000
Posted Cash Collateral Related to Contracts with Cross Default Provisions 2,294,000   2,294,000   8,107,000
Additional Settlement Liability if Cross Default Provision is Triggered 37,533,000   37,533,000   27,603,000
Derivatives and Hedging (Textuals) [Abstract]          
Cash Collateral Received Netted Against Risk Management Assets 2,664,000   2,664,000   4,291,000
Cash Collateral Paid Netted Against Risk Management Liabilities 19,667,000   19,667,000   28,964,000
Maximum Term for Exposure to Variability of Future Cash Flows (in months)      23    
Indiana Michigan Power Co [Member]
          
Commodity:          
Power (In MWHs) 126,489,000   126,489,000   109,326,000
Coal (In Tons) 1,842,000   1,842,000   1,920,000
Natural Gas (In MMBtus) 8,793,000   8,793,000   5,081,000
Heating Oil and Gasoline (In Gallons) 348,000   348,000   525,000
Interest Rate 25,484,000   25,484,000   19,890,000
Interest Rate and Foreign Currency 200,000,000   200,000,000   200,000,000
Cash Collateral Netting          
Cash Collateral Received Netted Against Risk Management Assets 1,874,000   1,874,000   2,752,000
Cash Collateral Paid Netted Against Risk Management Liabilities 13,793,000   13,793,000   18,547,000
Fair Value of Derivative Instruments          
Current Risk Management Assets 39,058,000   39,058,000   32,152,000
Long-term Risk Management Assets 31,408,000   31,408,000   29,362,000
Total Assets 70,466,000   70,466,000   61,514,000
Current Risk Management Liabilities 34,239,000   34,239,000   16,980,000
Long-term Risk Management Liabilities 15,908,000   15,908,000   18,871,000
Total Liabilities 50,147,000   50,147,000   35,851,000
Total MTM Derivative Contract Net Assets (Liabilities) 20,319,000   20,319,000   25,663,000
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 66,000 1,613,000 6,495,000 7,591,000  
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI (12,828,000) (8,154,000) (15,284,000) (8,685,000) (8,685,000)
Changes in Fair Value Recognized in AOCI (8,078,000) (25,000) (6,476,000) 53,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (20,261,000) (7,626,000) (20,261,000) (7,626,000)  
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
AOCI Gain (Loss) Net of Tax (20,261,000) (7,626,000) (20,261,000) (7,626,000)  
Maximum Term for Exposure to Variability of Future Cash Flows (in months)      23    
Collateral Triggering Events [Abstract]          
Liabilities for Derivative Contracts with Credit Downgrade Triggers 1,357,000   1,357,000   6,418,000
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post 1,874,000   1,874,000   3,983,000
Amount Attributable to RTO and ISO Activities 1,874,000   1,874,000   3,983,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractural Netting Arrangements 83,000,000   83,000,000   59,936,000
Posted Cash Collateral Related to Contracts with Cross Default Provisions 1,613,000   1,613,000   5,200,000
Additional Settlement Liability if Cross Default Provision is Triggered 44,495,000   44,495,000   28,339,000
Derivatives and Hedging (Textuals) [Abstract]          
Cash Collateral Received Netted Against Risk Management Assets 1,874,000   1,874,000   2,752,000
Cash Collateral Paid Netted Against Risk Management Liabilities 13,793,000   13,793,000   18,547,000
Maximum Term for Exposure to Variability of Future Cash Flows (in months)      23    
Ohio Power Co [Member]
          
Commodity:          
Power (In MWHs) 264,309,000   264,309,000   229,468,000
Coal (In Tons) 6,337,000   6,337,000   8,337,000
Natural Gas (In MMBtus) 18,435,000   18,435,000   10,728,000
Heating Oil and Gasoline (In Gallons) 823,000   823,000   1,254,000
Interest Rate 53,426,000   53,426,000   42,093,000
Interest Rate and Foreign Currency 0   0   0
Cash Collateral Netting          
Cash Collateral Received Netted Against Risk Management Assets 3,929,000   3,929,000   5,810,000
Cash Collateral Paid Netted Against Risk Management Liabilities 28,948,000   28,948,000   39,183,000
Fair Value of Derivative Instruments          
Current Risk Management Assets 62,962,000   62,962,000   54,293,000
Long-term Risk Management Assets 66,290,000   66,290,000   53,614,000
Total Assets 129,252,000   129,252,000   107,907,000
Current Risk Management Liabilities 35,141,000   35,141,000   36,561,000
Long-term Risk Management Liabilities 33,753,000   33,753,000   17,890,000
Total Liabilities 68,894,000   68,894,000   54,451,000
Total MTM Derivative Contract Net Assets (Liabilities) 60,358,000   60,358,000   53,456,000
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 821,000 6,974,000 6,183,000 17,886,000  
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI 5,965,000 10,742,000 7,706,000 10,449,000 10,449,000
Changes in Fair Value Recognized in AOCI (525,000) (64,000) (3,402,000) 143,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI 6,135,000 10,970,000 6,135,000 10,970,000  
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
AOCI Gain (Loss) Net of Tax 6,135,000 10,970,000 6,135,000 10,970,000  
Maximum Term for Exposure to Variability of Future Cash Flows (in months)      23    
Collateral Triggering Events [Abstract]          
Liabilities for Derivative Contracts with Credit Downgrade Triggers 2,845,000   2,845,000   13,550,000
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post 3,928,000   3,928,000   8,410,000
Amount Attributable to RTO and ISO Activities 3,928,000   3,928,000   8,410,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractural Netting Arrangements 136,073,000   136,073,000   104,091,000
Posted Cash Collateral Related to Contracts with Cross Default Provisions 3,383,000   3,383,000   10,978,000
Additional Settlement Liability if Cross Default Provision is Triggered 55,347,000   55,347,000   37,380,000
Derivatives and Hedging (Textuals) [Abstract]          
Cash Collateral Received Netted Against Risk Management Assets 3,929,000   3,929,000   5,810,000
Cash Collateral Paid Netted Against Risk Management Liabilities 28,948,000   28,948,000   39,183,000
Maximum Term for Exposure to Variability of Future Cash Flows (in months)      23    
Public Service Co Of Oklahoma [Member]
          
Commodity:          
Power (In MWHs) 35,000   35,000   39,000
Coal (In Tons) 1,915,000   1,915,000   3,574,000
Natural Gas (In MMBtus) 78,000   78,000   115,000
Heating Oil and Gasoline (In Gallons) 372,000   372,000   618,000
Interest Rate 0   0   175,000
Interest Rate and Foreign Currency 0   0   0
Cash Collateral Netting          
Cash Collateral Received Netted Against Risk Management Assets 30,000   30,000   53,000
Cash Collateral Paid Netted Against Risk Management Liabilities 136,000   136,000   130,000
Fair Value of Derivative Instruments          
Current Risk Management Assets 592,000   592,000   565,000
Long-term Risk Management Assets 131,000   131,000   314,000
Total Assets 723,000   723,000   879,000
Current Risk Management Liabilities 4,651,000   4,651,000   1,280,000
Long-term Risk Management Liabilities 2,490,000   2,490,000   1,330,000
Total Liabilities 7,141,000   7,141,000   2,610,000
Total MTM Derivative Contract Net Assets (Liabilities) (6,418,000)   (6,418,000)   (1,731,000)
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts (618,000) 1,643,000 (5,797,000) 1,787,000  
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI 7,096,000 8,051,000 7,149,000 8,494,000 8,494,000
Changes in Fair Value Recognized in AOCI (155,000) (32,000) (16,000) (296,000)  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI 6,737,000 7,738,000 6,737,000 7,738,000  
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
AOCI Gain (Loss) Net of Tax 6,737,000 7,738,000 6,737,000 7,738,000  
Maximum Term for Exposure to Variability of Future Cash Flows (in months)      18    
Collateral Triggering Events [Abstract]          
Liabilities for Derivative Contracts with Credit Downgrade Triggers 0   0   0
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post 1,002,000   1,002,000   856,000
Amount Attributable to RTO and ISO Activities 269,000   269,000   414,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractural Netting Arrangements 150,000   150,000   142,000
Posted Cash Collateral Related to Contracts with Cross Default Provisions 0   0   0
Additional Settlement Liability if Cross Default Provision is Triggered 44,000   44,000   61,000
Derivatives and Hedging (Textuals) [Abstract]          
Cash Collateral Received Netted Against Risk Management Assets 30,000   30,000   53,000
Cash Collateral Paid Netted Against Risk Management Liabilities 136,000   136,000   130,000
Maximum Term for Exposure to Variability of Future Cash Flows (in months)      18    
Southwestern Electric Power Co [Member]
          
Commodity:          
Power (In MWHs) 44,000   44,000   49,000
Coal (In Tons) 2,857,000   2,857,000   2,974,000
Natural Gas (In MMBtus) 98,000   98,000   145,000
Heating Oil and Gasoline (In Gallons) 357,000   357,000   569,000
Interest Rate 0   0   203,000
Interest Rate and Foreign Currency 0   0   200,069,000
Cash Collateral Netting          
Cash Collateral Received Netted Against Risk Management Assets 37,000   37,000   66,000
Cash Collateral Paid Netted Against Risk Management Liabilities 133,000   133,000   124,000
Fair Value of Derivative Instruments          
Current Risk Management Assets 1,297,000   1,297,000   445,000
Long-term Risk Management Assets 368,000   368,000   282,000
Total Assets 1,665,000   1,665,000   727,000
Current Risk Management Liabilities 8,009,000   8,009,000   24,359,000
Long-term Risk Management Liabilities 335,000   335,000   221,000
Total Liabilities 8,344,000   8,344,000   24,580,000
Total MTM Derivative Contract Net Assets (Liabilities) (6,679,000)   (6,679,000)   (23,853,000)
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts (88,000) 1,498,000 (6,845,000) 3,604,000  
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI (17,299,000) (3,814,000) (15,524,000) (4,190,000) (4,190,000)
Changes in Fair Value Recognized in AOCI (150,000) 768,000 (2,794,000) 969,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (16,903,000) (2,925,000) (16,903,000) (2,925,000)  
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
AOCI Gain (Loss) Net of Tax (16,903,000) (2,925,000) (16,903,000) (2,925,000)  
Maximum Term for Exposure to Variability of Future Cash Flows (in months)      18    
Collateral Triggering Events [Abstract]          
Liabilities for Derivative Contracts with Credit Downgrade Triggers 0   0   0
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post 1,263,000   1,263,000   1,128,000
Amount Attributable to RTO and ISO Activities 339,000   339,000   522,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractural Netting Arrangements 189,000   189,000   19,322,000
Posted Cash Collateral Related to Contracts with Cross Default Provisions 0   0   0
Additional Settlement Liability if Cross Default Provision is Triggered 55,000   55,000   19,220,000
Derivatives and Hedging (Textuals) [Abstract]          
Cash Collateral Received Netted Against Risk Management Assets 37,000   37,000   66,000
Cash Collateral Paid Netted Against Risk Management Liabilities 133,000   133,000   124,000
Maximum Term for Exposure to Variability of Future Cash Flows (in months)      18    
Risk Management Contracts [Member]
          
Fair Value of Derivative Instruments          
Total Assets 597,000,000 [2],[3]   597,000,000 [2],[3]   548,000,000 [2],[4]
Total Liabilities 329,000,000 [2],[3]   329,000,000 [2],[3]   278,000,000 [2],[4]
Risk Management Contracts [Member] | Appalachian Power Co [Member]
          
Fair Value of Derivative Instruments          
Total Assets 84,677,000 [2],[5]   84,677,000 [2],[5]   76,907,000 [2],[5]
Total Liabilities 41,903,000 [2],[5]   41,903,000 [2],[5]   37,111,000 [2],[5]
Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
          
Fair Value of Derivative Instruments          
Total Assets 69,172,000 [2],[5]   69,172,000 [2],[5]   60,254,000 [2],[5]
Total Liabilities 29,446,000 [2],[5]   29,446,000 [2],[5]   23,691,000 [2],[5]
Risk Management Contracts [Member] | Ohio Power Co [Member]
          
Fair Value of Derivative Instruments          
Total Assets 126,539,000 [2],[5]   126,539,000 [2],[5]   105,247,000 [2],[5]
Total Liabilities 63,394,000 [2],[5]   63,394,000 [2],[5]   51,212,000 [2],[5]
Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
          
Fair Value of Derivative Instruments          
Total Assets 723,000 [2],[5]   723,000 [2],[5]   879,000 [2],[5]
Total Liabilities 7,000,000 [2],[5]   7,000,000 [2],[5]   2,503,000 [2],[5]
Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
          
Fair Value of Derivative Instruments          
Total Assets 1,665,000 [2],[5]   1,665,000 [2],[5]   724,000 [2],[5]
Total Liabilities 8,208,000 [2],[5]   8,208,000 [2],[5]   5,340,000 [2],[5]
Fair Value Hedges [Member]
          
Fair Value of Derivative Instruments          
Total Assets 2,000,000   2,000,000    
Other [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets (815,000,000) [6]   (815,000,000) [6]   (683,000,000) [6]
Long-term Risk Management Assets (310,000,000) [6]   (310,000,000) [6]   (253,000,000) [6]
Total Assets (1,125,000,000) [6]   (1,125,000,000) [6]   (936,000,000) [6]
Current Risk Management Liabilities (872,000,000) [6]   (872,000,000) [6]   (746,000,000) [6]
Long-term Risk Management Liabilities (350,000,000) [6]   (350,000,000) [6]   (325,000,000) [6]
Total Liabilities (1,222,000,000) [6]   (1,222,000,000) [6]   (1,071,000,000) [6]
Total MTM Derivative Contract Net Assets (Liabilities) 97,000,000 [6]   97,000,000 [6]   135,000,000 [6]
Other [Member] | Appalachian Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets (211,963,000) [6]   (211,963,000) [6]   (194,179,000) [6]
Long-term Risk Management Assets (67,862,000) [6]   (67,862,000) [6]   (60,615,000) [6]
Total Assets (279,825,000) [6]   (279,825,000) [6]   (254,794,000) [6]
Current Risk Management Liabilities (223,751,000) [6]   (223,751,000) [6]   (211,515,000) [6]
Long-term Risk Management Liabilities (73,954,000) [6]   (73,954,000) [6]   (69,485,000) [6]
Total Liabilities (297,705,000) [6]   (297,705,000) [6]   (281,000,000) [6]
Total MTM Derivative Contract Net Assets (Liabilities) 17,880,000 [6]   17,880,000 [6]   26,206,000 [6]
Other [Member] | Indiana Michigan Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets (148,563,000) [6]   (148,563,000) [6]   (123,143,000) [6]
Long-term Risk Management Assets (47,702,000) [6]   (47,702,000) [6]   (38,743,000) [6]
Total Assets (196,265,000) [6]   (196,265,000) [6]   (161,886,000) [6]
Current Risk Management Liabilities (156,819,000) [6]   (156,819,000) [6]   (134,233,000) [6]
Long-term Risk Management Liabilities (51,982,000) [6]   (51,982,000) [6]   (44,431,000) [6]
Total Liabilities (208,801,000) [6]   (208,801,000) [6]   (178,664,000) [6]
Total MTM Derivative Contract Net Assets (Liabilities) 12,536,000 [6]   12,536,000 [6]   16,778,000 [6]
Other [Member] | Ohio Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets (326,116,000) [6]   (326,116,000) [6]   (273,020,000) [6]
Long-term Risk Management Assets (100,856,000) [6]   (100,856,000) [6]   (83,027,000) [6]
Total Assets (426,972,000) [6]   (426,972,000) [6]   (356,047,000) [6]
Current Risk Management Liabilities (343,450,000) [6]   (343,450,000) [6]   (296,458,000) [6]
Long-term Risk Management Liabilities (109,834,000) [6]   (109,834,000) [6]   (95,038,000) [6]
Total Liabilities (453,284,000) [6]   (453,284,000) [6]   (391,496,000) [6]
Total MTM Derivative Contract Net Assets (Liabilities) 26,312,000 [6]   26,312,000 [6]   35,449,000 [6]
Other [Member] | Public Service Co Of Oklahoma [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets (4,369,000) [6]   (4,369,000) [6]   (6,415,000) [6]
Long-term Risk Management Assets (252,000) [6]   (252,000) [6]   (600,000) [6]
Total Assets (4,621,000) [6]   (4,621,000) [6]   (7,015,000) [6]
Current Risk Management Liabilities (4,456,000) [6]   (4,456,000) [6]   (6,492,000) [6]
Long-term Risk Management Liabilities (271,000) [6]   (271,000) [6]   (600,000) [6]
Total Liabilities (4,727,000) [6]   (4,727,000) [6]   (7,092,000) [6]
Total MTM Derivative Contract Net Assets (Liabilities) 106,000 [6]   106,000 [6]   77,000 [6]
Other [Member] | Southwestern Electric Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets (12,275,000) [6]   (12,275,000) [6]   (5,885,000) [6]
Long-term Risk Management Assets (706,000) [6]   (706,000) [6]   (536,000) [6]
Total Assets (12,981,000) [6]   (12,981,000) [6]   (6,421,000) [6]
Current Risk Management Liabilities (12,352,000) [6]   (12,352,000) [6]   (5,943,000) [6]
Long-term Risk Management Liabilities (725,000) [6]   (725,000) [6]   (536,000) [6]
Total Liabilities (13,077,000) [6]   (13,077,000) [6]   (6,479,000) [6]
Total MTM Derivative Contract Net Assets (Liabilities) 96,000 [6]   96,000 [6]   58,000 [6]
Interest Rate and Foreign Currency [Member]
          
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI (18,000,000) 4,000,000 (20,000,000) 4,000,000 4,000,000
Changes in Fair Value Recognized in AOCI (13,000,000) 0 (12,000,000) (1,000,000)  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (30,000,000) 5,000,000 (30,000,000) 5,000,000 (20,000,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 0 [1]   0 [1]   0 [1]
Hedging Liabilities 35,000,000 [1]   35,000,000 [1]   42,000,000 [1]
AOCI Gain (Loss) Net of Tax (30,000,000) 5,000,000 (30,000,000) 5,000,000 (20,000,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     (3,000,000)   (2,000,000)
Interest Rate and Foreign Currency [Member] | Appalachian Power Co [Member]
          
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI 1,293,000 217,000 1,024,000 217,000 217,000
Changes in Fair Value Recognized in AOCI 0 0 0 (373,000)  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI 1,562,000 486,000 1,562,000 486,000 1,024,000
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 0 [1]   0 [1]   0 [1]
Hedging Liabilities 0 [1]   0 [1]   0 [1]
AOCI Gain (Loss) Net of Tax 1,562,000 486,000 1,562,000 486,000 1,024,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     (1,021,000)   (1,052,000)
Interest Rate and Foreign Currency [Member] | Indiana Michigan Power Co [Member]
          
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI (11,320,000) (8,255,000) (14,465,000) (8,507,000) (8,507,000)
Changes in Fair Value Recognized in AOCI (7,844,000) 0 (4,848,000) 0  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (19,015,000) (8,004,000) (19,015,000) (8,004,000) (14,465,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 0 [1]   0 [1]   0 [1]
Hedging Liabilities 18,095,000 [1]   18,095,000 [1]   10,637,000 [1]
AOCI Gain (Loss) Net of Tax (19,015,000) (8,004,000) (19,015,000) (8,004,000) (14,465,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     (938,000)   (595,000)
Interest Rate and Foreign Currency [Member] | Ohio Power Co [Member]
          
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI 9,114,000 10,473,000 9,454,000 10,813,000 10,813,000
Changes in Fair Value Recognized in AOCI 0 0 0 0  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI 8,774,000 10,133,000 8,774,000 10,133,000 9,454,000
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 0 [1]   0 [1]   0 [1]
Hedging Liabilities 0 [1]   0 [1]   0 [1]
AOCI Gain (Loss) Net of Tax 8,774,000 10,133,000 8,774,000 10,133,000 9,454,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     1,359,000   1,359,000
Interest Rate and Foreign Currency [Member] | Public Service Co Of Oklahoma [Member]
          
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI 7,029,000 7,787,000 7,218,000 8,406,000 8,406,000
Changes in Fair Value Recognized in AOCI 0 0 0 (476,000)  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI 6,839,000 7,598,000 6,839,000 7,598,000 7,218,000
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 0 [1]   0 [1]   0 [1]
Hedging Liabilities 0 [1]   0 [1]   0 [1]
AOCI Gain (Loss) Net of Tax 6,839,000 7,598,000 6,839,000 7,598,000 7,218,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     759,000   759,000
Interest Rate and Foreign Currency [Member] | Southwestern Electric Power Co [Member]
          
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI (17,365,000) (4,058,000) (15,462,000) (4,272,000) (4,272,000)
Changes in Fair Value Recognized in AOCI (1,000) 794,000 (2,777,000) 801,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (16,806,000) (3,057,000) (16,806,000) (3,057,000) (15,462,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 0 [1]   0 [1]   3,000 [1]
Hedging Liabilities 0 [1]   0 [1]   19,143,000 [1]
AOCI Gain (Loss) Net of Tax (16,806,000) (3,057,000) (16,806,000) (3,057,000) (15,462,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     (2,369,000)   (1,864,000)
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 1,000,000 [7]   1,000,000 [7]   0 [7]
Long-term Risk Management Assets 1,000,000 [7]   1,000,000 [7]   0 [7]
Total Assets 2,000,000 [7]   2,000,000 [7]   0 [7]
Current Risk Management Liabilities 33,000,000 [7]   33,000,000 [7]   20,000,000 [7]
Long-term Risk Management Liabilities 2,000,000 [7]   2,000,000 [7]   22,000,000 [7]
Total Liabilities 35,000,000 [7]   35,000,000 [7]   42,000,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) (33,000,000) [7]   (33,000,000) [7]   (42,000,000) [7]
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Appalachian Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 0 [7]   0 [7]   0 [7]
Long-term Risk Management Assets 0 [7]   0 [7]   0 [7]
Total Assets 0 [7]   0 [7]   0 [7]
Current Risk Management Liabilities 0 [7]   0 [7]   0 [7]
Long-term Risk Management Liabilities 0 [7]   0 [7]   0 [7]
Total Liabilities 0 [7]   0 [7]   0 [7]
Total MTM Derivative Contract Net Assets (Liabilities) 0 [7]   0 [7]   0 [7]
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Indiana Michigan Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 0 [7]   0 [7]   0 [7]
Long-term Risk Management Assets 0 [7]   0 [7]   0 [7]
Total Assets 0 [7]   0 [7]   0 [7]
Current Risk Management Liabilities 18,095,000 [7]   18,095,000 [7]   0 [7]
Long-term Risk Management Liabilities 0 [7]   0 [7]   10,637,000 [7]
Total Liabilities 18,095,000 [7]   18,095,000 [7]   10,637,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) (18,095,000) [7]   (18,095,000) [7]   (10,637,000) [7]
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Ohio Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 0 [7]   0 [7]   0 [7]
Long-term Risk Management Assets 0 [7]   0 [7]   0 [7]
Total Assets 0 [7]   0 [7]   0 [7]
Current Risk Management Liabilities 0 [7]   0 [7]   0 [7]
Long-term Risk Management Liabilities 0 [7]   0 [7]   0 [7]
Total Liabilities 0 [7]   0 [7]   0 [7]
Total MTM Derivative Contract Net Assets (Liabilities) 0 [7]   0 [7]   0 [7]
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 0 [7]   0 [7]   0 [7]
Long-term Risk Management Assets 0 [7]   0 [7]   0 [7]
Total Assets 0 [7]   0 [7]   0 [7]
Current Risk Management Liabilities 0 [7]   0 [7]   0 [7]
Long-term Risk Management Liabilities 0 [7]   0 [7]   0 [7]
Total Liabilities 0 [7]   0 [7]   0 [7]
Total MTM Derivative Contract Net Assets (Liabilities) 0 [7]   0 [7]   0 [7]
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member] | Southwestern Electric Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 0 [7]   0 [7]   3,000 [7]
Long-term Risk Management Assets 0 [7]   0 [7]   0 [7]
Total Assets 0 [7]   0 [7]   3,000 [7]
Current Risk Management Liabilities 0 [7]   0 [7]   19,143,000 [7]
Long-term Risk Management Liabilities 0 [7]   0 [7]   0 [7]
Total Liabilities 0 [7]   0 [7]   19,143,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) 0 [7]   0 [7]   (19,140,000) [7]
Commodity [Member]
          
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI (16,000,000) 8,000,000 (3,000,000) 7,000,000 7,000,000
Changes in Fair Value Recognized in AOCI (3,000,000) 3,000,000 (23,000,000) 5,000,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (14,000,000) 12,000,000 (14,000,000) 12,000,000 (3,000,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 38,000,000 [1]   38,000,000 [1]   20,000,000 [1]
Hedging Liabilities 60,000,000 [1]   60,000,000 [1]   25,000,000 [1]
AOCI Gain (Loss) Net of Tax (14,000,000) 12,000,000 (14,000,000) 12,000,000 (3,000,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     (10,000,000)   (3,000,000)
Commodity [Member] | Appalachian Power Co [Member]
          
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI (2,117,000) 238,000 (1,309,000) (273,000) (273,000)
Changes in Fair Value Recognized in AOCI (403,000) (55,000) (2,248,000) 123,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (1,820,000) 669,000 (1,820,000) 669,000 (1,309,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 963,000 [1]   963,000 [1]   431,000 [1]
Hedging Liabilities 3,771,000 [1]   3,771,000 [1]   2,418,000 [1]
AOCI Gain (Loss) Net of Tax (1,820,000) 669,000 (1,820,000) 669,000 (1,309,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     (1,543,000)   (1,140,000)
Commodity [Member] | Indiana Michigan Power Co [Member]
          
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI (1,508,000) 101,000 (819,000) (178,000) (178,000)
Changes in Fair Value Recognized in AOCI (234,000) (25,000) (1,628,000) 53,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (1,246,000) 378,000 (1,246,000) 378,000 (819,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 677,000 [1]   677,000 [1]   277,000 [1]
Hedging Liabilities 2,606,000 [1]   2,606,000 [1]   1,523,000 [1]
AOCI Gain (Loss) Net of Tax (1,246,000) 378,000 (1,246,000) 378,000 (819,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     (1,057,000)   (712,000)
Commodity [Member] | Ohio Power Co [Member]
          
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI (3,149,000) 269,000 (1,748,000) (364,000) (364,000)
Changes in Fair Value Recognized in AOCI (525,000) (64,000) (3,402,000) 143,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (2,639,000) 837,000 (2,639,000) 837,000 (1,748,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 1,420,000 [1]   1,420,000 [1]   584,000 [1]
Hedging Liabilities 5,500,000 [1]   5,500,000 [1]   3,239,000 [1]
AOCI Gain (Loss) Net of Tax (2,639,000) 837,000 (2,639,000) 837,000 (1,748,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     (2,236,000)   (1,518,000)
Commodity [Member] | Public Service Co Of Oklahoma [Member]
          
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI 67,000 264,000 (69,000) 88,000 88,000
Changes in Fair Value Recognized in AOCI (155,000) (32,000) (16,000) 180,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (102,000) 140,000 (102,000) 140,000 (69,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 0 [1]   0 [1]   0 [1]
Hedging Liabilities 141,000 [1]   141,000 [1]   107,000 [1]
AOCI Gain (Loss) Net of Tax (102,000) 140,000 (102,000) 140,000 (69,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     (89,000)   (70,000)
Commodity [Member] | Southwestern Electric Power Co [Member]
          
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges          
Beginning Balance in AOCI 66,000 244,000 (62,000) 82,000 82,000
Changes in Fair Value Recognized in AOCI (149,000) (26,000) (17,000) 168,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Ending Balance in AOCI (97,000) 132,000 (97,000) 132,000 (62,000)
Impact of Cash Flow Hedges on the Condensed Balance Sheet          
Hedging Assets 0 [1]   0 [1]   0 [1]
Hedging Liabilities 136,000 [1]   136,000 [1]   97,000 [1]
AOCI Gain (Loss) Net of Tax (97,000) 132,000 (97,000) 132,000 (62,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months     (84,000)   (63,000)
Commodity [Member] | Risk Management Contracts [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 996,000,000 [7]   996,000,000 [7]   852,000,000 [7]
Long-term Risk Management Assets 733,000,000 [7]   733,000,000 [7]   641,000,000 [7]
Total Assets 1,729,000,000 [7]   1,729,000,000 [7]   1,493,000,000 [7]
Current Risk Management Liabilities 951,000,000 [7]   951,000,000 [7]   847,000,000 [7]
Long-term Risk Management Liabilities 586,000,000 [7]   586,000,000 [7]   483,000,000 [7]
Total Liabilities 1,537,000,000 [7]   1,537,000,000 [7]   1,330,000,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) 192,000,000 [7]   192,000,000 [7]   163,000,000 [7]
Commodity [Member] | Risk Management Contracts [Member] | Appalachian Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 252,825,000 [7]   252,825,000 [7]   232,784,000 [7]
Long-term Risk Management Assets 112,302,000 [7]   112,302,000 [7]   99,751,000 [7]
Total Assets 365,127,000 [7]   365,127,000 [7]   332,535,000 [7]
Current Risk Management Liabilities 243,424,000 [7]   243,424,000 [7]   235,354,000 [7]
Long-term Risk Management Liabilities 95,932,000 [7]   95,932,000 [7]   82,058,000 [7]
Total Liabilities 339,356,000 [7]   339,356,000 [7]   317,412,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) 25,771,000 [7]   25,771,000 [7]   15,123,000 [7]
Commodity [Member] | Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 186,932,000 [7]   186,932,000 [7]   154,628,000 [7]
Long-term Risk Management Assets 78,944,000 [7]   78,944,000 [7]   68,047,000 [7]
Total Assets 265,876,000 [7]   265,876,000 [7]   222,675,000 [7]
Current Risk Management Liabilities 170,637,000 [7]   170,637,000 [7]   149,466,000 [7]
Long-term Risk Management Liabilities 67,432,000 [7]   67,432,000 [7]   52,441,000 [7]
Total Liabilities 238,069,000 [7]   238,069,000 [7]   201,907,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) 27,807,000 [7]   27,807,000 [7]   20,768,000 [7]
Commodity [Member] | Risk Management Contracts [Member] | Ohio Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 387,633,000 [7]   387,633,000 [7]   325,904,000 [7]
Long-term Risk Management Assets 166,799,000 [7]   166,799,000 [7]   136,519,000 [7]
Total Assets 554,432,000 [7]   554,432,000 [7]   462,423,000 [7]
Current Risk Management Liabilities 373,685,000 [7]   373,685,000 [7]   329,307,000 [7]
Long-term Risk Management Liabilities 142,621,000 [7]   142,621,000 [7]   112,454,000 [7]
Total Liabilities 516,306,000 [7]   516,306,000 [7]   441,761,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) 38,126,000 [7]   38,126,000 [7]   20,662,000 [7]
Commodity [Member] | Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 4,961,000 [7]   4,961,000 [7]   6,980,000 [7]
Long-term Risk Management Assets 383,000 [7]   383,000 [7]   914,000 [7]
Total Assets 5,344,000 [7]   5,344,000 [7]   7,894,000 [7]
Current Risk Management Liabilities 8,987,000 [7]   8,987,000 [7]   7,665,000 [7]
Long-term Risk Management Liabilities 2,740,000 [7]   2,740,000 [7]   1,930,000 [7]
Total Liabilities 11,727,000 [7]   11,727,000 [7]   9,595,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) (6,383,000) [7]   (6,383,000) [7]   (1,701,000) [7]
Commodity [Member] | Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 13,572,000 [7]   13,572,000 [7]   6,327,000 [7]
Long-term Risk Management Assets 1,074,000 [7]   1,074,000 [7]   818,000 [7]
Total Assets 14,646,000 [7]   14,646,000 [7]   7,145,000 [7]
Current Risk Management Liabilities 20,246,000 [7]   20,246,000 [7]   11,062,000 [7]
Long-term Risk Management Liabilities 1,039,000 [7]   1,039,000 [7]   757,000 [7]
Total Liabilities 21,285,000 [7]   21,285,000 [7]   11,819,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) (6,639,000) [7]   (6,639,000) [7]   (4,674,000) [7]
Commodity [Member] | Hedging Contracts [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 37,000,000 [7]   37,000,000 [7]   24,000,000 [7]
Long-term Risk Management Assets 15,000,000 [7]   15,000,000 [7]   15,000,000 [7]
Total Assets 52,000,000 [7]   52,000,000 [7]   39,000,000 [7]
Current Risk Management Liabilities 53,000,000 [7]   53,000,000 [7]   29,000,000 [7]
Long-term Risk Management Liabilities 21,000,000 [7]   21,000,000 [7]   15,000,000 [7]
Total Liabilities 74,000,000 [7]   74,000,000 [7]   44,000,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) (22,000,000) [7]   (22,000,000) [7]   (5,000,000) [7]
Commodity [Member] | Hedging Contracts [Member] | Appalachian Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 979,000 [7]   979,000 [7]   1,040,000 [7]
Long-term Risk Management Assets 236,000 [7]   236,000 [7]   90,000 [7]
Total Assets 1,215,000 [7]   1,215,000 [7]   1,130,000 [7]
Current Risk Management Liabilities 3,363,000 [7]   3,363,000 [7]   2,767,000 [7]
Long-term Risk Management Liabilities 660,000 [7]   660,000 [7]   350,000 [7]
Total Liabilities 4,023,000 [7]   4,023,000 [7]   3,117,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) (2,808,000) [7]   (2,808,000) [7]   (1,987,000) [7]
Commodity [Member] | Hedging Contracts [Member] | Indiana Michigan Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 689,000 [7]   689,000 [7]   667,000 [7]
Long-term Risk Management Assets 166,000 [7]   166,000 [7]   58,000 [7]
Total Assets 855,000 [7]   855,000 [7]   725,000 [7]
Current Risk Management Liabilities 2,326,000 [7]   2,326,000 [7]   1,747,000 [7]
Long-term Risk Management Liabilities 458,000 [7]   458,000 [7]   224,000 [7]
Total Liabilities 2,784,000 [7]   2,784,000 [7]   1,971,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) (1,929,000) [7]   (1,929,000) [7]   (1,246,000) [7]
Commodity [Member] | Hedging Contracts [Member] | Ohio Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 1,445,000 [7]   1,445,000 [7]   1,409,000 [7]
Long-term Risk Management Assets 347,000 [7]   347,000 [7]   122,000 [7]
Total Assets 1,792,000 [7]   1,792,000 [7]   1,531,000 [7]
Current Risk Management Liabilities 4,906,000 [7]   4,906,000 [7]   3,712,000 [7]
Long-term Risk Management Liabilities 966,000 [7]   966,000 [7]   474,000 [7]
Total Liabilities 5,872,000 [7]   5,872,000 [7]   4,186,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) (4,080,000) [7]   (4,080,000) [7]   (2,655,000) [7]
Commodity [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 0 [7]   0 [7]   0 [7]
Long-term Risk Management Assets 0 [7]   0 [7]   0 [7]
Total Assets 0 [7]   0 [7]   0 [7]
Current Risk Management Liabilities 120,000 [7]   120,000 [7]   107,000 [7]
Long-term Risk Management Liabilities 21,000 [7]   21,000 [7]   0 [7]
Total Liabilities 141,000 [7]   141,000 [7]   107,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) (141,000) [7]   (141,000) [7]   (107,000) [7]
Commodity [Member] | Hedging Contracts [Member] | Southwestern Electric Power Co [Member]
          
Fair Value of Derivative Instruments          
Current Risk Management Assets 0 [7]   0 [7]   0 [7]
Long-term Risk Management Assets 0 [7]   0 [7]   0 [7]
Total Assets 0 [7]   0 [7]   0 [7]
Current Risk Management Liabilities 115,000 [7]   115,000 [7]   97,000 [7]
Long-term Risk Management Liabilities 21,000 [7]   21,000 [7]   0 [7]
Total Liabilities 136,000 [7]   136,000 [7]   97,000 [7]
Total MTM Derivative Contract Net Assets (Liabilities) (136,000) [7]   (136,000) [7]   (97,000) [7]
Utility Operations Revenues [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 4,000,000 18,000,000 14,000,000 38,000,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 2,000,000 0 2,000,000  
Utility Operations Revenues [Member] | Interest Rate and Foreign Currency [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Utility Operations Revenues [Member] | Commodity [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 2,000,000 0 2,000,000  
Electric Generation, Transmission and Distribution Revenues [Member] | Appalachian Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts (599,000) 883,000 (926,000) 2,699,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (3,000) 175,000 (3,000) 171,000  
Electric Generation, Transmission and Distribution Revenues [Member] | Indiana Michigan Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 2,579,000 3,702,000 5,392,000 9,117,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (9,000) 396,000 (9,000) 386,000  
Electric Generation, Transmission and Distribution Revenues [Member] | Ohio Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 2,538,000 11,564,000 11,031,000 22,154,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (24,000) 1,060,000 (24,000) 1,034,000  
Electric Generation, Transmission and Distribution Revenues [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 165,000 539,000 160,000 658,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Electric Generation, Transmission and Distribution Revenues [Member] | Southwestern Electric Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 303,000 403,000 252,000 526,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Electric Generation, Transmission and Distribution Revenues [Member] | Commodity [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (3,000) 175,000 (3,000) 171,000  
Electric Generation, Transmission and Distribution Revenues [Member] | Commodity [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (9,000) 396,000 (9,000) 386,000  
Electric Generation, Transmission and Distribution Revenues [Member] | Commodity [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (24,000) 1,060,000 (24,000) 1,034,000  
Electric Generation, Transmission and Distribution Revenues [Member] | Commodity [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Electric Generation, Transmission and Distribution Revenues [Member] | Commodity [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Sales to AEP Affiliates [Member] | Appalachian Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 0 13,000 0 33,000  
Sales to AEP Affiliates [Member] | Indiana Michigan Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 0 6,000 0 23,000  
Sales to AEP Affiliates [Member] | Ohio Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 0 13,000 0 45,000  
Sales to AEP Affiliates [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 0 (1,000) 0 0  
Sales to AEP Affiliates [Member] | Southwestern Electric Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 0 (1,000) 0 0  
Other Revenues [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 5,000,000 13,000,000 8,000,000 15,000,000  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (2,000,000) (1,000,000) (3,000,000) (2,000,000)  
Other Revenues [Member] | Interest Rate and Foreign Currency [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Other Revenues [Member] | Commodity [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (2,000,000) (1,000,000) (3,000,000) (2,000,000)  
Fuel and Other Consumables Used for Electric Generation [Member] | Appalachian Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 0 0 0 0  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Fuel and Other Consumables Used for Electric Generation [Member] | Indiana Michigan Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 0 0 0 0  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Fuel and Other Consumables Used for Electric Generation [Member] | Ohio Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 0 0 0 0  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Fuel and Other Consumables Used for Electric Generation [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 0 0 0 0  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Fuel and Other Consumables Used for Electric Generation [Member] | Southwestern Electric Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 0 0 0 0  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Fuel and Other Consumables Used for Electric Generation [Member] | Commodity [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Fuel and Other Consumables Used for Electric Generation [Member] | Commodity [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Fuel and Other Consumables Used for Electric Generation [Member] | Commodity [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Fuel and Other Consumables Used for Electric Generation [Member] | Commodity [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Fuel and Other Consumables Used for Electric Generation [Member] | Commodity [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Purchased Electricity for Resale [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 6,000,000 (1,000,000) 13,000,000 (1,000,000)  
Purchased Electricity for Resale [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 157,000 (41,000) 376,000 46,000  
Purchased Electricity for Resale [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 419,000 (92,000) 986,000 102,000  
Purchased Electricity for Resale [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 1,099,000 (246,000) 2,585,000 275,000  
Purchased Electricity for Resale [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Purchased Electricity for Resale [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Purchased Electricity for Resale [Member] | Interest Rate and Foreign Currency [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Purchased Electricity for Resale [Member] | Commodity [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 6,000,000 (1,000,000) 13,000,000 (1,000,000)  
Purchased Electricity for Resale [Member] | Commodity [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 157,000 (41,000) 376,000 46,000  
Purchased Electricity for Resale [Member] | Commodity [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 419,000 (92,000) 986,000 102,000  
Purchased Electricity for Resale [Member] | Commodity [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 1,099,000 (246,000) 2,585,000 275,000  
Purchased Electricity for Resale [Member] | Commodity [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Purchased Electricity for Resale [Member] | Commodity [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Other Operation Expense [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (14,000) (31,000) (16,000) (44,000)  
Other Operation Expense [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (8,000) (28,000) (10,000) (37,000)  
Other Operation Expense [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (19,000) (60,000) (24,000) (83,000)  
Other Operation Expense [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (9,000) (34,000) (11,000) (47,000)  
Other Operation Expense [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (7,000) (33,000) (9,000) (46,000)  
Other Operation Expense [Member] | Interest Rate and Foreign Currency [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Other Operation Expense [Member] | Interest Rate and Foreign Currency [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Other Operation Expense [Member] | Interest Rate and Foreign Currency [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Other Operation Expense [Member] | Interest Rate and Foreign Currency [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Other Operation Expense [Member] | Interest Rate and Foreign Currency [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Other Operation Expense [Member] | Commodity [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (14,000) (31,000) (16,000) (44,000)  
Other Operation Expense [Member] | Commodity [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (8,000) (28,000) (10,000) (37,000)  
Other Operation Expense [Member] | Commodity [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (19,000) (60,000) (24,000) (83,000)  
Other Operation Expense [Member] | Commodity [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (9,000) (34,000) (11,000) (47,000)  
Other Operation Expense [Member] | Commodity [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (7,000) (33,000) (9,000) (46,000)  
Maintenance Expense [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (6,000) (65,000) (9,000) (90,000)  
Maintenance Expense [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (3,000) (22,000) (4,000) (32,000)  
Maintenance Expense [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (8,000) (51,000) (10,000) (70,000)  
Maintenance Expense [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (2,000) (22,000) (2,000) (29,000)  
Maintenance Expense [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (2,000) (24,000) (3,000) (32,000)  
Maintenance Expense [Member] | Commodity [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (6,000) (65,000) (9,000) (90,000)  
Maintenance Expense [Member] | Commodity [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (3,000) (22,000) (4,000) (32,000)  
Maintenance Expense [Member] | Commodity [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (8,000) (51,000) (10,000) (70,000)  
Maintenance Expense [Member] | Commodity [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (2,000) (22,000) (2,000) (29,000)  
Maintenance Expense [Member] | Commodity [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (2,000) (24,000) (3,000) (32,000)  
Depreciation and Amortization Expense [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Depreciation and Amortization Expense [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Depreciation and Amortization Expense [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 1,000 1,000 2,000 2,000  
Depreciation and Amortization Expense [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Depreciation and Amortization Expense [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Depreciation and Amortization Expense [Member] | Interest Rate and Foreign Currency [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Depreciation and Amortization Expense [Member] | Interest Rate and Foreign Currency [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Depreciation and Amortization Expense [Member] | Interest Rate and Foreign Currency [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 1,000 1,000 2,000 2,000  
Depreciation and Amortization Expense [Member] | Interest Rate and Foreign Currency [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Depreciation and Amortization Expense [Member] | Interest Rate and Foreign Currency [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Interest Expense [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 1,000,000 1,000,000 2,000,000 2,000,000  
Interest Expense [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 269,000 269,000 538,000 642,000  
Interest Expense [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 149,000 251,000 298,000 503,000  
Interest Expense [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (341,000) (341,000) (682,000) (682,000)  
Interest Expense [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (190,000) (189,000) (379,000) (332,000)  
Interest Expense [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 560,000 207,000 1,433,000 414,000  
Interest Expense [Member] | Interest Rate and Foreign Currency [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 1,000,000 1,000,000 2,000,000 2,000,000  
Interest Expense [Member] | Interest Rate and Foreign Currency [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 269,000 269,000 538,000 642,000  
Interest Expense [Member] | Interest Rate and Foreign Currency [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 149,000 251,000 298,000 503,000  
Interest Expense [Member] | Interest Rate and Foreign Currency [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (341,000) (341,000) (682,000) (682,000)  
Interest Expense [Member] | Interest Rate and Foreign Currency [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (190,000) (189,000) (379,000) (332,000)  
Interest Expense [Member] | Interest Rate and Foreign Currency [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 560,000 207,000 1,433,000 414,000  
Interest Expense [Member] | Commodity [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income 0 0 0 0  
Property Plant and Equipment [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (10,000) (57,000) (12,000) (80,000)  
Property Plant and Equipment [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (6,000) (28,000) (7,000) (39,000)  
Property Plant and Equipment [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (13,000) (71,000) (16,000) (98,000)  
Property Plant and Equipment [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (3,000) (36,000) (4,000) (52,000)  
Property Plant and Equipment [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (5,000) (29,000) (6,000) (40,000)  
Property Plant and Equipment [Member] | Commodity [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (10,000) (57,000) (12,000) (80,000)  
Property Plant and Equipment [Member] | Commodity [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (6,000) (28,000) (7,000) (39,000)  
Property Plant and Equipment [Member] | Commodity [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (13,000) (71,000) (16,000) (98,000)  
Property Plant and Equipment [Member] | Commodity [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (3,000) (36,000) (4,000) (52,000)  
Property Plant and Equipment [Member] | Commodity [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income (5,000) (29,000) (6,000) (40,000)  
Regulatory Assets [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts (17,000,000) [8] (5,000,000) [8] (38,000,000) [8] (1,000,000) [8]  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 1,000,000 [8] 1,000,000 [8] 2,000,000 [8] 1,000,000 [8]  
Regulatory Assets [Member] | Appalachian Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts (3,796,000) [8] (150,000) [8] (7,277,000) [8] 223,000 [8]  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 576,000 [8] 505,000 [8] 1,401,000 [8] 816,000 [8]  
Regulatory Assets [Member] | Indiana Michigan Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts (2,905,000) [8] (1,018,000) [8] (6,015,000) [8] 115,000 [8]  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 103,000 [8] 76,000 [8] 245,000 [8] 123,000 [8]  
Regulatory Assets [Member] | Ohio Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts (8,895,000) [8] (4,603,000) [8] (12,026,000) [8] (4,208,000) [8]  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Assets [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts (757,000) [8] 644,000 [8] (5,958,000) [8] 276,000 [8]  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Assets [Member] | Southwestern Electric Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts (364,000) [8] 404,000 [8] (7,092,000) [8] 2,046,000 [8]  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Assets [Member] | Interest Rate and Foreign Currency [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Assets [Member] | Commodity [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 1,000,000 [8] 1,000,000 [8] 2,000,000 [8] 1,000,000 [8]  
Regulatory Assets [Member] | Commodity [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 576,000 [8] 505,000 [8] 1,401,000 [8] 816,000 [8]  
Regulatory Assets [Member] | Commodity [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 103,000 [8] 76,000 [8] 245,000 [8] 123,000 [8]  
Regulatory Assets [Member] | Commodity [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Assets [Member] | Commodity [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Assets [Member] | Commodity [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 13,000,000 [8] 5,000,000 [8] 27,000,000 [8] 11,000,000 [8]  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member] | Appalachian Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 4,711,000 [8] 4,142,000 [8] 11,120,000 [8] 10,896,000 [8]  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member] | Indiana Michigan Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 392,000 [8] (1,077,000) [8] 7,118,000 [8] (1,664,000) [8]  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member] | Ohio Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts 7,178,000 [8] 0 [8] 7,178,000 [8] (105,000) [8]  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts (26,000) [8] 461,000 [8] 1,000 [8] 853,000 [8]  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member] | Southwestern Electric Power Co [Member]
          
Amount of Gain (Loss) Recognized on Risk Management Contracts          
Amount of Gain (Loss) Recognized on Risk Management Contracts (27,000) [8] 692,000 [8] (5,000) [8] 1,032,000 [8]  
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member] | Interest Rate and Foreign Currency [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member] | Commodity [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member] | Commodity [Member] | Appalachian Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member] | Commodity [Member] | Indiana Michigan Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member] | Commodity [Member] | Ohio Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member] | Commodity [Member] | Public Service Co Of Oklahoma [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet 0 [8] 0 [8] 0 [8] 0 [8]  
Regulatory Liabilities [Member] | Commodity [Member] | Southwestern Electric Power Co [Member]
          
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:          
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet $ 0 [8] $ 0 [8] $ 0 [8] $ 0 [8]  
[1] Hedging Assets and Hedging Liabilities are included in Risk Management Assets and Liabilities on the condensed balance sheets.
[2] Amounts in ''Other'' column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for ''Derivatives and Hedging.''
[3] The June 30, 2012 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $2 million in 2012, $12 million in periods 2013-2015 and ($8) million in periods 2016-2018; Level 2 matures $12 million in 2012, $52 million in periods 2013-2015, $17 million in periods 2016-2017 and $9 million in periods 2018-2030; Level 3 matures $7 million in 2012, $38 million in periods 2013-2015, $24 million in periods 2016-2017 and $27 million in periods 2018-2030. Risk management commodity contracts are substantially comprised of power contracts.
[4] The December 31, 2011 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $3 million in 2012, $7 million in periods 2013-2015 and ($6) million in periods 2016-2018; Level 2 matures $21 million in 2012, $50 million in periods 2013-2015, $11 million in periods 2016-2017 and $8 million in periods 2018-2030; Level 3 matures ($19) million in 2012, $44 million in periods 2013-2015, $18 million in periods 2016-2017 and $26 million in periods 2018-2030. Risk management commodity contracts are substantially comprised of power contracts.
[5] Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.
[6] Amounts include counterparty netting of risk management and hedging contracts and associated cash collateral in accordance with the accounting guidance for "Derivatives and Hedging." Amounts also include de-designated risk management contracts.
[7] Derivative instruments within these categories are reported gross. These instruments are subject to master netting agreements and are presented on the condensed balance sheets on a net basis in accordance with the accounting guidance for "Derivatives and Hedging."
[8] Represents realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the condensed balance sheets.