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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Current Assets  
Other Temporary Investments$ 240,000,000$ 416,000,000
Fuel544,000,000837,000,000
Property, Plant and Equipment  
Other Property, Plant and Equipment3,880,000,0003,846,000,000
Accumulated Depreciation and Amortization18,680,000,00018,066,000,000
Current Liabilities  
Long-term Debt Due Within One Year1,267,000,0001,309,000,000
Noncurrent Liabilities  
Long-term Debt15,183,000,00015,502,000,000
Equity  
Common Stock, Par Value Per Share$ 6.50$ 6.50
Common Stock, Shares Authorized600,000,000600,000,000
Common Stock, Shares, Issued503,177,402501,114,881
Treasury Stock, Shares20,307,72520,307,725
Appalachian Power Co [Member]
  
Current Assets  
Fuel90,260,000230,697,000
Property, Plant and Equipment  
Other Property, Plant and Equipment356,081,000348,013,000
Accumulated Depreciation and Amortization2,975,417,0002,843,087,000
Current Liabilities  
Long-term Debt Due Within One Year545,024,000479,672,000
Noncurrent Liabilities  
Long-term Debt3,181,045,0003,081,469,000
Equity  
Common Stock, Par Value Per Share$ 0$ 0
Common Stock, Shares Authorized30,000,00030,000,000
Common Stock, Shares Outstanding13,499,50013,499,500
Columbus Southern Power Co [Member]
  
Current Assets  
Fuel50,022,00072,882,000
Property, Plant and Equipment  
Other Property, Plant and Equipment207,235,000203,593,000
Accumulated Depreciation and Amortization2,021,245,0001,927,112,000
Current Liabilities  
Long-term Debt Due Within One Year194,500,0000
Noncurrent Liabilities  
Long-term Debt1,244,539,0001,438,830,000
Equity  
Common Stock, Par Value Per Share$ 0$ 0
Common Stock, Shares Authorized24,000,00024,000,000
Common Stock, Shares Outstanding16,410,42616,410,426
Indiana Michigan Power Co [Member]
  
Current Assets  
Fuel60,545,00087,551,000
Property, Plant and Equipment  
Other Property, Plant and Equipment729,393,000719,708,000
Accumulated Depreciation and Amortization3,203,493,0003,124,998,000
Current Liabilities  
Long-term Debt Due Within One Year155,307,000154,457,000
Noncurrent Liabilities  
Long-term Debt1,830,426,0001,849,769,000
Equity  
Common Stock, Par Value Per Share$ 0$ 0
Common Stock, Shares Authorized2,500,0002,500,000
Common Stock, Shares Outstanding1,400,0001,400,000
Indiana Michigan Power Co [Member] | DCC Fuel [Member]
  
Current Liabilities  
Long-term Debt Due Within One Year72,819,00077,457,000
Ohio Power Co [Member]
  
Current Assets  
Fuel168,077,000257,289,000
Property, Plant and Equipment  
Other Property, Plant and Equipment360,175,000359,254,000
Accumulated Depreciation and Amortization3,671,813,0003,606,777,000
Current Liabilities  
Long-term Debt Due Within One Year50,000,000165,000,000
Noncurrent Liabilities  
Long-term Debt2,364,910,0002,364,522,000
Equity  
Common Stock, Par Value Per Share$ 0$ 0
Common Stock, Shares Authorized40,000,00040,000,000
Common Stock, Shares Outstanding27,952,47327,952,473
Public Service Co Of Oklahoma [Member]
  
Current Assets  
Fuel17,248,00020,176,000
Property, Plant and Equipment  
Other Property, Plant and Equipment239,615,000235,406,000
Accumulated Depreciation and Amortization1,281,237,0001,255,064,000
Current Liabilities  
Long-term Debt Due Within One Year350,00025,000,000
Noncurrent Liabilities  
Long-term Debt945,385,000946,186,000
Equity  
Common Stock, Par Value Per Share$ 15$ 15
Common Stock, Shares Authorized11,000,00011,000,000
Common Stock, Shares, Issued10,482,00010,482,000
Common Stock, Shares Outstanding9,013,0009,013,000
Southwestern Electric Power Co [Member]
  
Current Assets  
Fuel96,908,00091,777,000
Property, Plant and Equipment  
Other Property, Plant and Equipment642,833,000632,158,000
Accumulated Depreciation and Amortization2,206,849,0002,130,351,000
Current Liabilities  
Long-term Debt Due Within One Year20,000,00041,135,000
Noncurrent Liabilities  
Long-term Debt1,708,574,0001,728,385,000
Equity  
Common Stock, Par Value Per Share$ 18$ 18
Common Stock, Shares Authorized7,600,0007,600,000
Common Stock, Shares Outstanding7,536,6407,536,640
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member]
  
Current Assets  
Fuel26,484,00035,055,000
Property, Plant and Equipment  
Other Property, Plant and Equipment231,991,000224,857,000
Accumulated Depreciation and Amortization99,690,00091,840,000
AEP Subsidiaries [Member]
  
Current Assets  
Other Temporary Investments211,000,000287,000,000
Current Liabilities  
Long-term Debt Due Within One Year264,000,000237,000,000
Noncurrent Liabilities  
Long-term Debt$ 1,625,000,000$ 1,857,000,000