Condensed Consolidated Statements of Changes in Equity (USD $)	Total	Appalachian Power Co [Member]	Indiana Michigan Power Co [Member]	Ohio Power Co [Member]	Public Service Co Of Oklahoma [Member]	Southwestern Electric Power Co [Member]	Common Stock [Member]	Common Stock [Member] Appalachian Power Co [Member]	Common Stock [Member] Indiana Michigan Power Co [Member]	Common Stock [Member] Ohio Power Co [Member]	Common Stock [Member] Public Service Co Of Oklahoma [Member]	Common Stock [Member] Southwestern Electric Power Co [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Appalachian Power Co [Member]	Additional Paid-in Capital [Member] Indiana Michigan Power Co [Member]	Additional Paid-in Capital [Member] Ohio Power Co [Member]	Additional Paid-in Capital [Member] Public Service Co Of Oklahoma [Member]	Additional Paid-in Capital [Member] Southwestern Electric Power Co [Member]	Retained Earnings [Member]	Retained Earnings [Member] Appalachian Power Co [Member]	Retained Earnings [Member] Indiana Michigan Power Co [Member]	Retained Earnings [Member] Ohio Power Co [Member]	Retained Earnings [Member] Public Service Co Of Oklahoma [Member]	Retained Earnings [Member] Southwestern Electric Power Co [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Other Comprehensive Income [Member] Appalachian Power Co [Member]	Accumulated Other Comprehensive Income [Member] Indiana Michigan Power Co [Member]	Accumulated Other Comprehensive Income [Member] Ohio Power Co [Member]	Accumulated Other Comprehensive Income [Member] Public Service Co Of Oklahoma [Member]	Accumulated Other Comprehensive Income [Member] Southwestern Electric Power Co [Member]	Noncontrolling Interests [Member]	Noncontrolling Interests [Member] Southwestern Electric Power Co [Member]
Beginning Balance at Dec. 31, 2011	$ 14,665,000,000	$ 2,936,414,000	$ 1,760,980,000	$ 4,450,178,000	$ 892,805,000	$ 1,813,757,000	$ 3,274,000,000	$ 260,458,000	$ 56,584,000	$ 321,201,000	$ 157,230,000	$ 135,660,000	$ 5,970,000,000	$ 1,573,752,000	$ 980,896,000	$ 1,744,099,000	$ 364,037,000	$ 674,606,000	$ 5,890,000,000	$ 1,160,747,000	$ 751,721,000	$ 2,582,600,000	$ 364,389,000	$ 1,029,915,000	$ (470,000,000)	$ (58,543,000)	$ (28,221,000)	$ (197,722,000)	$ 7,149,000	$ (26,815,000)	$ 1,000,000	$ 391,000
Beginning Balance, Shares at Dec. 31, 2011							504,000,000
Issuance of Common Stock, Value	50,000,000						10,000,000						40,000,000
Issuance of Common Stock, Shares							1,000,000
Common Stock Dividends		(100,000,000)	(25,000,000)	(150,000,000)	(30,000,000)															(100,000,000)	(25,000,000)	(150,000,000)	(30,000,000)
Common Stock Dividends	(458,000,000)					(2,195,000)													(456,000,000)												(2,000,000)	(2,195,000)
Other Changes in Equity	3,000,000												3,000,000
Net Income (Loss)																			751,000,000					89,153,000
Net Income (Loss) Attributable to Noncontrolling Interests	2,000,000					2,144,000																									2,000,000	2,144,000
Net Income (Loss)	753,000,000	137,643,000	69,031,000	252,253,000	47,859,000	91,297,000														137,643,000	69,031,000	252,253,000	47,859,000
Other Comprehensive Income (Loss)	(5,000,000)	1,826,000	(4,420,000)	4,910,000	(412,000)	(1,047,000)																			(5,000,000)	1,826,000	(4,420,000)	4,910,000	(412,000)	(1,047,000)
Ending Balance at Jun. 30, 2012	15,008,000,000	2,975,883,000	1,800,591,000	4,557,341,000	910,252,000	1,901,812,000	3,284,000,000	260,458,000	56,584,000	321,201,000	157,230,000	135,660,000	6,013,000,000	1,573,752,000	980,896,000	1,744,099,000	364,037,000	674,606,000	6,185,000,000	1,198,390,000	795,752,000	2,684,853,000	382,248,000	1,119,068,000	(475,000,000)	(56,717,000)	(32,641,000)	(192,812,000)	6,737,000	(27,862,000)	1,000,000	340,000
Ending Balance, Shares at Jun. 30, 2012							505,000,000
Beginning Balance at Mar. 31, 2012
Net Income (Loss) Attributable to Noncontrolling Interests	1,000,000					1,061,000
Net Income (Loss)	363,000,000	62,332,000	29,810,000	101,423,000	35,211,000	54,902,000
Other Comprehensive Income (Loss)	(3,000,000)	1,465,000	(7,155,000)	3,410,000		563,000
Ending Balance at Jun. 30, 2012	15,008,000,000	2,975,883,000	1,800,591,000	4,557,341,000	910,252,000	1,901,812,000		260,458,000	56,584,000	321,201,000	157,230,000	135,660,000		1,573,752,000	980,896,000	1,744,099,000	364,037,000	674,606,000
Beginning Balance at Dec. 31, 2012	15,237,000,000	3,052,562,000	1,803,775,000	4,525,709,000	916,278,000	2,021,473,000	3,289,000,000	260,458,000	56,584,000	321,201,000	157,230,000	135,660,000	6,049,000,000	1,573,752,000	980,896,000	1,744,099,000	364,037,000	674,606,000	6,236,000,000	1,248,250,000	795,178,000	2,626,134,000	388,530,000	1,228,806,000	(337,000,000)	(29,898,000)	(28,883,000)	(165,725,000)	6,481,000	(17,860,000)	0	261,000
Beginning Balance, Shares at Dec. 31, 2012	506,004,962				10,482,000
Issuance of Common Stock, Value	41,000,000						7,000,000						34,000,000
Issuance of Common Stock, Shares							1,000,000
Common Stock Dividends		(90,000,000)	(25,000,000)	(175,000,000)	(27,500,000)	(62,500,000)														(90,000,000)	(25,000,000)	(175,000,000)	(27,500,000)	(62,500,000)
Common Stock Dividends	(469,000,000)					(2,040,000)													(467,000,000)												(2,000,000)	(2,040,000)
Other Changes in Equity	1,000,000												1,000,000
Net Income (Loss)																			701,000,000					39,629,000
Net Income (Loss) Attributable to Noncontrolling Interests	2,000,000					2,146,000																									2,000,000	2,146,000
Net Income (Loss)	703,000,000	100,410,000	84,211,000	150,830,000	42,125,000	41,775,000														100,410,000	84,211,000	150,830,000	42,125,000
Other Comprehensive Income (Loss)	24,000,000	2,063,000	3,795,000	7,060,000	(421,000)	959,000																			24,000,000	2,063,000	3,795,000	7,060,000	(421,000)	959,000
Ending Balance at Jun. 30, 2013	15,537,000,000	3,065,035,000	1,866,781,000	4,508,599,000	930,482,000	1,999,667,000	3,296,000,000	260,458,000	56,584,000	321,201,000	157,230,000	135,660,000	6,084,000,000	1,573,752,000	980,896,000	1,744,099,000	364,037,000	674,606,000	6,470,000,000	1,258,660,000	854,389,000	2,601,964,000	403,155,000	1,205,935,000	(313,000,000)	(27,835,000)	(25,088,000)	(158,665,000)	6,060,000	(16,901,000)	0	367,000
Ending Balance, Shares at Jun. 30, 2013	507,071,824				10,482,000
Beginning Balance at Mar. 31, 2013
Net Income (Loss) Attributable to Noncontrolling Interests	1,000,000					1,056,000
Net Income (Loss)	339,000,000	29,862,000	40,754,000	21,056,000	28,432,000	30,227,000
Other Comprehensive Income (Loss)	(7,000,000)	447,000	496,000	2,725,000	(254,000)	426,000
Ending Balance at Jun. 30, 2013	$ 15,537,000,000	$ 3,065,035,000	$ 1,866,781,000	$ 4,508,599,000	$ 930,482,000	$ 1,999,667,000		$ 260,458,000	$ 56,584,000	$ 321,201,000	$ 157,230,000	$ 135,660,000		$ 1,573,752,000	$ 980,896,000	$ 1,744,099,000	$ 364,037,000	$ 674,606,000
Ending Balance, Shares at Jun. 30, 2013	507,071,824				10,482,000