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Variable Interest Entities (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Variable Interest Entities (Textuals) [Abstract]      
Securitization Bonds $ 2,281,000,000 [1] $ 1,688,000,000 [1]  
Securitized Transition Assets 2,117,000,000 1,627,000,000  
Percentage Ownership of "Allegheny Series" by a Nonaffiliated Company 100.00%    
Sabine Mining Co [Member]
      
Billings to Affiliates [Abstract]      
Billings from VIE 147,000,000 128,000,000 133,000,000
Variable Interest Entities (Textuals) [Abstract]      
Billings from VIE 147,000,000 128,000,000 133,000,000
Sabine Mining Co [Member] | Current Assets [Member]
      
ASSETS      
Assets 57,000,000 48,000,000  
Sabine Mining Co [Member] | Net Property Plant And Equipment [Member]
      
ASSETS      
Assets 170,000,000 154,000,000  
Sabine Mining Co [Member] | Other Non Current Assets [Member]
      
ASSETS      
Assets 55,000,000 42,000,000  
Sabine Mining Co [Member] | Total Assets [Member]
      
ASSETS      
Assets 282,000,000 244,000,000  
Sabine Mining Co [Member] | Current Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 32,000,000 68,000,000  
Sabine Mining Co [Member] | Noncurrent Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 250,000,000 176,000,000  
Sabine Mining Co [Member] | Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 0 0  
Sabine Mining Co [Member] | Total Liabilities And Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 282,000,000 244,000,000  
DCC Fuel [Member]
      
Variable Interest Entities (Textuals) [Abstract]      
Payments Made by I&M to DCC Fuel 127,000,000 85,000,000 59,000,000
DCC Fuel [Member] | Current Assets [Member]
      
ASSETS      
Assets 133,000,000 118,000,000  
DCC Fuel [Member] | Net Property Plant And Equipment [Member]
      
ASSETS      
Assets 176,000,000 188,000,000  
DCC Fuel [Member] | Other Non Current Assets [Member]
      
ASSETS      
Assets 92,000,000 118,000,000  
DCC Fuel [Member] | Total Assets [Member]
      
ASSETS      
Assets 401,000,000 424,000,000  
DCC Fuel [Member] | Current Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 121,000,000 103,000,000  
DCC Fuel [Member] | Noncurrent Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 280,000,000 321,000,000  
DCC Fuel [Member] | Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 0 0  
DCC Fuel [Member] | Total Liabilities And Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 401,000,000 424,000,000  
Protected Cell Of Energy Insurance Services, Inc. [Member]
      
Variable Interest Entities (Textuals) [Abstract]      
Insurance Premium Expense to Protected Cell 32,000,000 48,000,000 35,000,000
Protected Cell Of Energy Insurance Services, Inc. [Member] | Current Assets [Member]
      
ASSETS      
Assets 130,000,000 121,000,000  
Protected Cell Of Energy Insurance Services, Inc. [Member] | Net Property Plant And Equipment [Member]
      
ASSETS      
Assets 0 0  
Protected Cell Of Energy Insurance Services, Inc. [Member] | Other Non Current Assets [Member]
      
ASSETS      
Assets 4,000,000 6,000,000  
Protected Cell Of Energy Insurance Services, Inc. [Member] | Total Assets [Member]
      
ASSETS      
Assets 134,000,000 127,000,000  
Protected Cell Of Energy Insurance Services, Inc. [Member] | Current Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 43,000,000 40,000,000  
Protected Cell Of Energy Insurance Services, Inc. [Member] | Noncurrent Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 66,000,000 71,000,000  
Protected Cell Of Energy Insurance Services, Inc. [Member] | Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 25,000,000 16,000,000  
Protected Cell Of Energy Insurance Services, Inc. [Member] | Total Liabilities And Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 134,000,000 127,000,000  
AEP Credit, Inc. [Member]
      
Variable Interest Entities (Textuals) [Abstract]      
Minimum Percentage of Equity AEP Provides 5.00%    
Percentage of Short Term Borrowing Needs in Excess of Third Party Financings 20.00%    
AEP Credit, Inc. [Member] | Current Assets [Member]
      
ASSETS      
Assets 843,000,000 910,000,000  
AEP Credit, Inc. [Member] | Net Property Plant And Equipment [Member]
      
ASSETS      
Assets 0 0  
AEP Credit, Inc. [Member] | Other Non Current Assets [Member]
      
ASSETS      
Assets 1,000,000 1,000,000  
AEP Credit, Inc. [Member] | Total Assets [Member]
      
ASSETS      
Assets 844,000,000 911,000,000  
AEP Credit, Inc. [Member] | Current Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 800,000,000 864,000,000  
AEP Credit, Inc. [Member] | Noncurrent Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 1,000,000 1,000,000  
AEP Credit, Inc. [Member] | Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 43,000,000 46,000,000  
AEP Credit, Inc. [Member] | Total Liabilities And Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 844,000,000 911,000,000  
PATH West Virginia Transmission Co, LLC [Member] | Capital Contribution From Parent [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 19,000,000 19,000,000  
Maximum Exposure 19,000,000 19,000,000  
PATH West Virginia Transmission Co, LLC [Member] | Retained Earnings [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 12,000,000 10,000,000  
Maximum Exposure 12,000,000 10,000,000  
PATH West Virginia Transmission Co, LLC [Member] | Total Investment [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 31,000,000 29,000,000  
Maximum Exposure 31,000,000 29,000,000  
Dolet Hills Lignite Co, LLC [Member]
      
Billings to Affiliates [Abstract]      
Billings from VIE 77,000,000 62,000,000 56,000,000
Variable Interest Entities (Textuals) [Abstract]      
Billings from VIE 77,000,000 62,000,000 56,000,000
Percentage of VIE Sales of Lignite Produced 50.00%    
Percentage of DHLCs Debt Guaranteed by Each SWEPCo and CLECO 50.00%    
Percentage of Management Fee Received by SWEPCo from DHLC 100.00%    
Dolet Hills Lignite Co, LLC [Member] | Capital Contribution From Parent [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 8,000,000 8,000,000  
Maximum Exposure 8,000,000 8,000,000  
Dolet Hills Lignite Co, LLC [Member] | Retained Earnings [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 1,000,000 1,000,000  
Maximum Exposure 1,000,000 1,000,000  
Dolet Hills Lignite Co, LLC [Member] | SWEPCo's Guarantee Of Debt [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 0 0  
Maximum Exposure 49,000,000 52,000,000  
Dolet Hills Lignite Co, LLC [Member] | Total Investment [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 9,000,000 9,000,000  
Maximum Exposure 58,000,000 61,000,000  
AEP Texas Central Transition Funding Co [Member] | Current Assets [Member]
      
ASSETS      
Assets 250,000,000 220,000,000  
AEP Texas Central Transition Funding Co [Member] | Net Property Plant And Equipment [Member]
      
ASSETS      
Assets 0 0  
AEP Texas Central Transition Funding Co [Member] | Other Non Current Assets [Member]
      
ASSETS      
Assets 2,167,000,000 [2] 1,580,000,000  
Variable Interest Entities (Textuals) [Abstract]      
Intercompany Item Eliminated in Consolidation 89,000,000    
AEP Texas Central Transition Funding Co [Member] | Total Assets [Member]
      
ASSETS      
Assets 2,417,000,000 1,800,000,000  
AEP Texas Central Transition Funding Co [Member] | Current Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 304,000,000 229,000,000  
AEP Texas Central Transition Funding Co [Member] | Noncurrent Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 2,095,000,000 1,557,000,000  
AEP Texas Central Transition Funding Co [Member] | Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 18,000,000 14,000,000  
AEP Texas Central Transition Funding Co [Member] | Total Liabilities And Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 2,417,000,000 1,800,000,000  
Appalachian Power Co [Member] | Billings from AEP Service Corporation [Member]
      
Billings to Affiliates [Abstract]      
Billings from VIE 195,176,000 195,787,000 238,367,000
Variable Interest Entities (Textuals) [Abstract]      
Billings from VIE 195,176,000 195,787,000 238,367,000
Appalachian Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 29,819,000 20,812,000  
Maximum Exposure 29,819,000 20,812,000  
Indiana Michigan Power Co [Member] | DCC Fuel [Member]
      
Variable Interest Entities (Textuals) [Abstract]      
Payments Made by I&M to DCC Fuel 127,000,000 85,000,000 59,000,000
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Current Assets [Member]
      
ASSETS      
Assets 132,886,000 118,144,000  
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Net Property Plant And Equipment [Member]
      
ASSETS      
Assets 176,065,000 188,375,000  
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Other Non Current Assets [Member]
      
ASSETS      
Assets 92,473,000 117,772,000  
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Total Assets [Member]
      
ASSETS      
Assets 401,424,000 424,291,000  
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Current Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 120,873,000 102,946,000  
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Noncurrent Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 280,551,000 321,345,000  
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 0 0  
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Total Liabilities And Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 401,424,000 424,291,000  
Indiana Michigan Power Co [Member] | Billings from AEP Service Corporation [Member]
      
Billings to Affiliates [Abstract]      
Billings from VIE 127,232,000 126,505,000 139,920,000
Variable Interest Entities (Textuals) [Abstract]      
Billings from VIE 127,232,000 126,505,000 139,920,000
Indiana Michigan Power Co [Member] | Billings from AEP Generating Company [Member]
      
Billings to Affiliates [Abstract]      
Billings from VIE 238,865,000 228,739,000 235,741,000
Variable Interest Entities (Textuals) [Abstract]      
Billings from VIE 238,865,000 228,739,000 235,741,000
Indiana Michigan Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 17,911,000 13,741,000  
Maximum Exposure 17,911,000 13,741,000  
Indiana Michigan Power Co [Member] | Carrying Amount in AEP Generating Company's Accounts Payable [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 25,498,000 25,731,000  
Maximum Exposure 25,498,000 25,731,000  
Ohio Power Co [Member] | Billings from AEP Service Corporation [Member]
      
Billings to Affiliates [Abstract]      
Billings from VIE 277,232,000 279,652,000 332,431,000
Variable Interest Entities (Textuals) [Abstract]      
Billings from VIE 277,232,000 279,652,000 332,431,000
Ohio Power Co [Member] | Billings from AEP Generating Company [Member]
      
Billings to Affiliates [Abstract]      
Billings from VIE 203,582,000 185,741,000 113,801,000
Variable Interest Entities (Textuals) [Abstract]      
Billings from VIE 203,582,000 185,741,000 113,801,000
Ohio Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 39,323,000 29,823,000  
Maximum Exposure 39,323,000 29,823,000  
Ohio Power Co [Member] | Carrying Amount in AEP Generating Company's Accounts Payable [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 16,302,000 22,139,000  
Maximum Exposure 16,302,000 22,139,000  
Public Service Co of Oklahoma [Member] | Billings from AEP Service Corporation [Member]
      
Billings to Affiliates [Abstract]      
Billings from VIE 89,199,000 84,028,000 102,116,000
Variable Interest Entities (Textuals) [Abstract]      
Billings from VIE 89,199,000 84,028,000 102,116,000
Public Service Co of Oklahoma [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 13,381,000 9,280,000  
Maximum Exposure 13,381,000 9,280,000  
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member]
      
Billings to Affiliates [Abstract]      
Billings from VIE 147,000,000 128,000,000 133,000,000
Variable Interest Entities (Textuals) [Abstract]      
Billings from VIE 147,000,000 128,000,000 133,000,000
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Current Assets [Member]
      
ASSETS      
Assets 56,535,000 48,044,000  
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Net Property Plant And Equipment [Member]
      
ASSETS      
Assets 170,436,000 153,715,000  
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Other Non Current Assets [Member]
      
ASSETS      
Assets 55,076,000 42,574,000  
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Total Assets [Member]
      
ASSETS      
Assets 282,047,000 244,333,000  
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Current Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 31,446,000 67,779,000  
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Noncurrent Liabilities [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 250,340,000 176,163,000  
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 261,000 391,000  
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Total Liabilities And Equity [Member]
      
LIABILITIES AND EQUITY      
Liabilities and Equity 282,047,000 244,333,000  
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member]
      
Billings to Affiliates [Abstract]      
Billings from VIE 77,000,000 62,000,000 56,000,000
Variable Interest Entities (Textuals) [Abstract]      
Billings from VIE 77,000,000 62,000,000 56,000,000
Percentage of VIE Sales of Lignite Produced 50.00%    
Percentage of DHLCs Debt Guaranteed by Each SWEPCo and CLECO 50.00%    
Percentage of Management Fee Received by SWEPCo from DHLC 100.00%    
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member] | Capital Contribution From Parent [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 7,643,000 7,643,000  
Maximum Exposure 7,643,000 7,643,000  
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member] | Retained Earnings [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 946,000 1,120,000  
Maximum Exposure 946,000 1,120,000  
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member] | SWEPCo's Guarantee Of Debt [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 0 0  
Maximum Exposure 49,564,000 52,310,000  
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member] | Total Investment [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 8,589,000 8,763,000  
Maximum Exposure 58,153,000 61,073,000  
Southwestern Electric Power Co [Member] | Billings from AEP Service Corporation [Member]
      
Billings to Affiliates [Abstract]      
Billings from VIE 136,642,000 130,148,000 147,928,000
Variable Interest Entities (Textuals) [Abstract]      
Billings from VIE 136,642,000 130,148,000 147,928,000
Southwestern Electric Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
As Reported on the Balance Sheet 19,669,000 14,699,000  
Maximum Exposure $ 19,669,000 $ 14,699,000  
AEP Generating Co [Member] | Rockport Generating Plant (Unit No. 1) [Member]
      
Variable Interest Entities (Textuals) [Abstract]      
Jointly Owned Utility Plant, Proportionate Ownership Share 50.00%    
AEP Generating Co [Member] | Rockport Generating Plant (Unit No. 2) [Member]
      
Variable Interest Entities (Textuals) [Abstract]      
Percentage Interest in Rockport Plant Unit 2 Lease 50.00%    
AEP Generating Co [Member] | Lawrenceburg Generating Station [Member]
      
Variable Interest Entities (Textuals) [Abstract]      
Jointly Owned Utility Plant, Proportionate Ownership Share 100.00%    
Cleco Power, LLC [Member]
      
Variable Interest Entities (Textuals) [Abstract]      
Percentage of VIE Sales of Lignite Produced 50.00%    
[1] In 2012, AEP Texas Central Transition Funding III LLC issued $800 million of Securitization Bonds (see Note 15).
[2] Includes an intercompany item eliminated in consolidation of $89 million.