Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended		6 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013 Uk Windfall Tax Issue [Member]	Dec. 31, 2012 Uk Windfall Tax Issue [Member]	Sep. 30, 2013 Appalachian Power Co [Member]	Sep. 30, 2012 Appalachian Power Co [Member]	Sep. 30, 2013 Appalachian Power Co [Member]	Sep. 30, 2012 Appalachian Power Co [Member]	Sep. 30, 2013 Indiana Michigan Power Co [Member]	Sep. 30, 2012 Indiana Michigan Power Co [Member]	Sep. 30, 2013 Indiana Michigan Power Co [Member]	Sep. 30, 2012 Indiana Michigan Power Co [Member]	Sep. 30, 2013 Ohio Power Co [Member]	Sep. 30, 2012 Ohio Power Co [Member]	Sep. 30, 2013 Ohio Power Co [Member]	Sep. 30, 2012 Ohio Power Co [Member]	Sep. 30, 2013 Public Service Co Of Oklahoma [Member]	Sep. 30, 2012 Public Service Co Of Oklahoma [Member]	Sep. 30, 2013 Public Service Co Of Oklahoma [Member]	Sep. 30, 2012 Public Service Co Of Oklahoma [Member]	Sep. 30, 2013 Southwestern Electric Power Co [Member]	Sep. 30, 2012 Southwestern Electric Power Co [Member]	Sep. 30, 2013 Southwestern Electric Power Co [Member]	Sep. 30, 2012 Southwestern Electric Power Co [Member]
Income Taxes (Textuals) [Abstract]
Reduction in Expected Future Cash Flow													$ (10,000,000)
Original WV Corporate Income Tax Rate			7.00%						7.00%				7.00%				7.00%
Reduced WV Corporate Income Tax Rate			6.50%						6.50%				6.50%				6.50%
Income Tax Benefit	(257,000,000)	(241,000,000)	(520,000,000)	(620,000,000)	80,000,000		(41,645,000)	(34,185,000)	(108,554,000)	(120,377,000)	(27,953,000)	(16,974,000)	(69,102,000)	(45,755,000)	(93,141,000)	(82,578,000)	(174,313,000)	(213,290,000)	(32,217,000)	(35,355,000)	(58,778,000)	(64,872,000)	(14,935,000)	(25,229,000)	(37,057,000)	(49,206,000)
Interest and Investment Income	3,000,000	2,000,000	55,000,000	6,000,000	43,000,000
Net Income (Loss)	434,000,000	488,000,000	1,137,000,000	1,241,000,000	108,000,000		62,625,000	63,191,000	163,035,000	200,834,000	57,880,000	39,254,000	142,091,000	108,285,000	178,901,000	151,510,000	329,731,000	403,763,000	51,096,000	58,103,000	93,221,000	105,962,000	7,920,000	89,218,000	49,695,000	180,515,000
Unrecognized Tax Benefits						$ 64,000,000