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, 2013	$ 16,086,000,000	$ 3,229,432,000	$ 1,922,153,000	$ 1,625,265,000	$ 942,101,000	$ 2,055,917,000	$ 3,303,000,000	$ 260,458,000	$ 56,584,000	$ 321,201,000	$ 157,230,000	$ 135,660,000	$ 6,131,000,000	$ 1,809,562,000	$ 980,896,000	$ 663,782,000	$ 364,037,000	$ 674,606,000	$ 6,766,000,000	$ 1,156,461,000	$ 900,182,000	$ 633,203,000	$ 415,076,000	$ 1,253,617,000	$ (115,000,000)	$ 2,951,000	$ (15,509,000)	$ 7,079,000	$ 5,758,000	$ (8,444,000)	$ 1,000,000	$ 478,000
Beginning Balance, Shares at Dec. 31, 2013							508,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Value	15,000,000						2,000,000						13,000,000
Issuance of Common Stock, Shares
Common Stock Dividends	(245,000,000)																		(244,000,000)
Common Stock Dividends		(20,000,000)	(25,000,000)	(25,000,000)		(25,000,000)														(20,000,000)	(25,000,000)	(25,000,000)		(25,000,000)
Common Stock Dividends						(1,236,000)																									(1,000,000)	(1,236,000)
Other Changes in Equity	(4,000,000)																		(6,000,000)												2,000,000
Net Income (Loss)																			560,000,000					21,860,000
Net Income (Loss) Attributable to Noncontrolling Interests	1,000,000					1,102,000																									1,000,000	1,102,000
Net Income (Loss)	561,000,000	101,851,000	87,089,000	60,774,000	8,448,000	22,962,000														101,851,000	87,089,000	60,774,000	8,448,000
Other Comprehensive Income (Loss)	6,000,000	(87,000)	468,000	(448,000)	(246,000)	268,000																			6,000,000	(87,000)	468,000	(448,000)	(246,000)	268,000
Ending Balance at Mar. 31, 2014	16,419,000,000	3,311,196,000	1,984,710,000	1,660,591,000	950,303,000	2,052,911,000	3,305,000,000	260,458,000	56,584,000	321,201,000	157,230,000	135,660,000	6,144,000,000	1,809,562,000	980,896,000	663,782,000	364,037,000	674,606,000	7,076,000,000	1,238,312,000	962,271,000	668,977,000	423,524,000	1,250,477,000	(109,000,000)	2,864,000	(15,041,000)	6,631,000	5,512,000	(8,176,000)	3,000,000	344,000
Ending Balance, Shares at Mar. 31, 2014							508,000,000
Beginning Balance at Dec. 31, 2014	16,824,000,000	3,366,928,000	1,953,949,000	1,980,210,000	1,028,215,000	2,097,201,000	3,313,000,000	260,458,000	56,584,000	321,201,000	157,230,000	135,660,000	6,204,000,000	1,809,562,000	980,896,000	838,782,000	364,037,000	674,606,000	7,406,000,000	1,291,876,000	930,829,000	814,625,000	502,005,000	1,293,986,000	(103,000,000)	5,032,000	(14,360,000)	5,602,000	4,943,000	(7,466,000)	4,000,000	415,000
Beginning Balance, Shares at Dec. 31, 2014	509,739,159				10,482,000		510,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Value	31,000,000						4,000,000						27,000,000
Issuance of Common Stock, Shares
Common Stock Dividends	(260,000,000)																		(259,000,000)
Common Stock Dividends		(56,250,000)	(30,000,000)	(37,500,000)		(30,000,000)														(56,250,000)	(30,000,000)	(37,500,000)		(30,000,000)
Common Stock Dividends						(1,062,000)																									(1,000,000)	(1,062,000)
Other Changes in Equity	5,000,000												3,000,000																		2,000,000
Deferred State Income Tax Rate Adjustment	17,000,000												17,000,000
Net Income (Loss)																			629,000,000					45,704,000
Net Income (Loss) Attributable to Noncontrolling Interests	2,000,000					1,033,000																									2,000,000	1,033,000
Net Income (Loss)	631,000,000	141,793,000	72,674,000	65,367,000	13,685,000	46,737,000														141,793,000	72,674,000	65,367,000	13,685,000
Other Comprehensive Income (Loss)	(5,000,000)	(329,000)	279,000	(343,000)	(190,000)	327,000																			(5,000,000)	(329,000)	279,000	(343,000)	(190,000)	327,000
Pension and OPEB Adjustment Related to Mitchell Plant	5,000,000																								5,000,000
Ending Balance at Mar. 31, 2015	$ 17,248,000,000	$ 3,452,142,000	$ 1,996,902,000	$ 2,007,734,000	$ 1,041,710,000	$ 2,113,203,000	$ 3,317,000,000	$ 260,458,000	$ 56,584,000	$ 321,201,000	$ 157,230,000	$ 135,660,000	$ 6,251,000,000	$ 1,809,562,000	$ 980,896,000	$ 838,782,000	$ 364,037,000	$ 674,606,000	$ 7,776,000,000	$ 1,377,419,000	$ 973,503,000	$ 842,492,000	$ 515,690,000	$ 1,309,690,000	$ (103,000,000)	$ 4,703,000	$ (14,081,000)	$ 5,259,000	$ 4,753,000	$ (7,139,000)	$ 7,000,000	$ 386,000
Ending Balance, Shares at Mar. 31, 2015	510,266,134				10,482,000		510,000,000