Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Current Assets
Cash and Cash Equivalents	$ 190,000,000	$ 163,000,000
Other Temporary Investments	293,000,000	386,000,000
Fuel	452,000,000	587,000,000
Property, Plant and Equipment
Other Property, Plant and Equipment	5,834,000,000	5,770,000,000
Accumulated Depreciation and Amortization	20,496,000,000	20,188,000,000
Current Liabilities
Long-term Debt Due Within One Year	2,451,000,000	2,503,000,000
Noncurrent Liabilities
Long-term Debt	16,778,000,000	16,181,000,000
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	510,266,134	509,739,159
Treasury Stock, Shares	20,336,592	20,336,592
Appalachian Power Co [Member]
Current Assets
Cash and Cash Equivalents	3,902,000	2,613,000
Fuel	71,131,000	113,386,000
Property, Plant and Equipment
Other Property, Plant and Equipment	380,512,000	373,520,000
Accumulated Depreciation and Amortization	3,897,327,000	3,823,664,000
Current Liabilities
Long-term Debt Due Within One Year	552,409,000	552,212,000
Noncurrent Liabilities
Long-term Debt	3,330,996,000	3,342,062,000
Equity
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	1,771,000	1,020,000
Fuel	47,969,000	54,623,000
Property, Plant and Equipment
Other Property, Plant and Equipment	1,474,324,000	1,490,820,000
Accumulated Depreciation and Amortization	3,440,400,000	3,410,341,000
Current Liabilities
Long-term Debt Due Within One Year	374,347,000	382,187,000
Noncurrent Liabilities
Long-term Debt	1,627,262,000	1,645,210,000
Equity
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	80,535,000	85,657,000
Ohio Power Co [Member]
Current Assets
Cash and Cash Equivalents	4,366,000	2,870,000
Property, Plant and Equipment
Other Property, Plant and Equipment	417,682,000	390,848,000
Accumulated Depreciation and Amortization	2,053,450,000	2,038,120,000
Current Liabilities
Long-term Debt Due Within One Year	132,044,000	131,497,000
Noncurrent Liabilities
Long-term Debt	2,142,997,000	2,165,626,000
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	45,973,000	45,427,000
Noncurrent Liabilities
Long-term Debt	164,295,000	187,041,000
Public Service Co Of Oklahoma [Member]
Current Assets
Cash and Cash Equivalents	1,424,000	1,352,000
Fuel	16,639,000	16,436,000
Property, Plant and Equipment
Other Property, Plant and Equipment	428,190,000	421,568,000
Accumulated Depreciation and Amortization	1,342,464,000	1,319,554,000
Current Liabilities
Long-term Debt Due Within One Year	430,000	427,000
Noncurrent Liabilities
Long-term Debt	1,290,585,000	1,040,609,000
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	7,975,000	14,356,000
Fuel	117,097,000	116,955,000
Property, Plant and Equipment
Other Property, Plant and Equipment	887,719,000	878,753,000
Accumulated Depreciation and Amortization	2,541,492,000	2,503,290,000
Current Liabilities
Long-term Debt Due Within One Year	253,250,000	306,750,000
Noncurrent Liabilities
Long-term Debt	2,282,111,000	1,833,687,000
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	6,201,000	12,695,000
Fuel	34,131,000	38,920,000
Property, Plant and Equipment
Other Property, Plant and Equipment	290,242,000	288,183,000
Accumulated Depreciation and Amortization	146,704,000	142,983,000
AEP Subsidiaries [Member]
Current Assets
Other Temporary Investments	281,000,000	371,000,000
Current Liabilities
Long-term Debt Due Within One Year	434,000,000	431,000,000
Noncurrent Liabilities
Long-term Debt	$ 2,084,000,000	$ 2,260,000,000