Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Current Assets
Cash and Cash Equivalents	$ 194,000,000	$ 118,000,000
Other Temporary Investments	318,000,000	353,000,000
Fuel	472,000,000	701,000,000
Property, Plant and Equipment
Other Property, Plant and Equipment	5,688,000,000	5,470,000,000
Accumulated Depreciation and Amortization	20,059,000,000	19,288,000,000
Current Liabilities
Long-term Debt Due Within One Year	2,381,000,000	1,549,000,000
Noncurrent Liabilities
Long-term Debt	15,677,000,000	16,828,000,000
Equity
Common Stock, Par Value Per Share	$ 6.50	$ 6.50
Common Stock, Shares Authorized	600,000,000	600,000,000
Common Stock, Shares, Issued	509,563,446	508,113,964
Treasury Stock, Shares	20,336,592	20,336,592
Appalachian Power Co [Member]
Current Assets
Cash and Cash Equivalents	2,701,000	2,745,000
Fuel	111,120,000	191,811,000
Property, Plant and Equipment
Other Property, Plant and Equipment	374,940,000	357,517,000
Accumulated Depreciation and Amortization	3,797,663,000	3,617,990,000
Current Liabilities
Long-term Debt Due Within One Year	652,211,000	342,360,000
Noncurrent Liabilities
Long-term Debt	3,241,896,000	3,765,997,000
Equity
Common Stock, No Par Value
Common Stock, Shares Authorized	30,000,000	30,000,000
Common Stock, Shares Outstanding	13,499,500	13,499,500
Indiana Michigan Power Co [Member]
Current Assets
Cash and Cash Equivalents	1,418,000	1,317,000
Fuel	45,891,000	53,807,000
Property, Plant and Equipment
Other Property, Plant and Equipment	1,441,401,000	1,421,361,000
Accumulated Depreciation and Amortization	3,403,540,000	3,299,349,000
Current Liabilities
Long-term Debt Due Within One Year	238,698,000	294,845,000
Noncurrent Liabilities
Long-term Debt	1,710,233,000	1,744,171,000
Equity
Common Stock, No Par Value
Common Stock, Shares Authorized	2,500,000	2,500,000
Common Stock, Shares Outstanding	1,400,000	1,400,000
Indiana Michigan Power Co [Member] | DCC Fuel [Member]
Current Liabilities
Long-term Debt Due Within One Year	64,434,000	107,143,000
Ohio Power Co [Member]
Current Assets
Cash and Cash Equivalents	3,889,000	3,004,000
Property, Plant and Equipment
Other Property, Plant and Equipment	389,392,000	364,573,000
Accumulated Depreciation and Amortization	2,011,530,000	1,973,042,000
Current Liabilities
Long-term Debt Due Within One Year	131,496,000	438,595,000
Noncurrent Liabilities
Long-term Debt	2,165,508,000	2,296,580,000
Equity
Common Stock, No Par Value
Common Stock, Shares Authorized	40,000,000	40,000,000
Common Stock, Shares Outstanding	27,952,473	27,952,473
Ohio Power Co [Member] | Ohio Phase-In-Recovery Funding [Member]
Current Liabilities
Long-term Debt Due Within One Year	45,427,000	34,936,000
Noncurrent Liabilities
Long-term Debt	187,040,000	232,466,000
Public Service Co Of Oklahoma [Member]
Current Assets
Cash and Cash Equivalents	1,828,000	1,277,000
Fuel	10,524,000	15,191,000
Property, Plant and Equipment
Other Property, Plant and Equipment	426,221,000	393,026,000
Accumulated Depreciation and Amortization	1,333,626,000	1,323,522,000
Current Liabilities
Long-term Debt Due Within One Year	424,000	34,115,000
Noncurrent Liabilities
Long-term Debt	1,040,632,000	965,695,000
Equity
Common Stock, Par Value Per Share	$ 15	$ 15
Common Stock, Shares Authorized	11,000,000	11,000,000
Common Stock, Shares, Issued	10,482,000	10,482,000
Common Stock, Shares Outstanding	9,013,000	9,013,000
Southwestern Electric Power Co [Member]
Current Assets
Cash and Cash Equivalents	23,986,000	17,241,000
Fuel	100,176,000	122,026,000
Property, Plant and Equipment
Other Property, Plant and Equipment	876,552,000	869,230,000
Accumulated Depreciation and Amortization	2,485,292,000	2,391,652,000
Current Liabilities
Long-term Debt Due Within One Year	306,750,000	3,250,000
Noncurrent Liabilities
Long-term Debt	1,833,598,000	2,040,082,000
Equity
Common Stock, Par Value Per Share	$ 18	$ 18
Common Stock, Shares Authorized	7,600,000	7,600,000
Common Stock, Shares Outstanding	7,536,640	7,536,640
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member]
Current Assets
Cash and Cash Equivalents	21,649,000	15,827,000
Fuel	31,320,000	37,518,000
Property, Plant and Equipment
Other Property, Plant and Equipment	286,792,000	291,556,000
Accumulated Depreciation and Amortization	138,776,000	134,282,000
AEP Subsidiaries [Member]
Current Assets
Other Temporary Investments	304,000,000	335,000,000
Current Liabilities
Long-term Debt Due Within One Year	409,000,000	416,000,000
Noncurrent Liabilities
Long-term Debt	$ 2,230,000,000	$ 2,532,000,000