Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Income (Loss)	$ 431,000	$ 391,000	$ 1,062,000	$ 952,000
OTHER COMPREHENSIVE INCOME
Cash Flow Hedges, Net of Tax	1,000	3,000	(5,000)	8,000
Securities Available for Sale, Net of Tax	(1,000)	1,000	0	1,000
Amortization of Pension and OPEB Deferred Costs, Net of Tax	1,000	1,000	1,000	2,000
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	1,000	5,000	(4,000)	11,000
TOTAL COMPREHENSIVE INCOME (LOSS)	432,000	396,000	1,058,000	963,000
Total Comprehensive Income Attributable to Noncontrolling Interest	1,000	1,000	3,000	2,000
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO COMMON SHAREHOLDERS	431,000	395,000	1,055,000	961,000
Appalachian Power Co [Member]
Net Income (Loss)	59,052	36,247	200,845	138,098
OTHER COMPREHENSIVE INCOME
Cash Flow Hedges, Net of Tax	2	166	131	412
Amortization of Pension and OPEB Deferred Costs, Net of Tax	(458)	(333)	(916)	(666)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	(456)	(167)	(785)	(254)
TOTAL COMPREHENSIVE INCOME (LOSS)	58,596	36,080	200,060	137,844
Indiana Michigan Power Co [Member]
Net Income (Loss)	50,581	27,334	123,255	114,423
OTHER COMPREHENSIVE INCOME
Cash Flow Hedges, Net of Tax	268	350	535	775
Amortization of Pension and OPEB Deferred Costs, Net of Tax	10	43	22	86
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	278	393	557	861
TOTAL COMPREHENSIVE INCOME (LOSS)	50,859	27,727	123,812	115,284
Ohio Power Co [Member]
Net Income (Loss)	47,752	56,535	113,119	117,309
OTHER COMPREHENSIVE INCOME
Cash Flow Hedges, Net of Tax	(343)	(343)	(686)	(791)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	(343)	(343)	(686)	(791)
TOTAL COMPREHENSIVE INCOME (LOSS)	47,409	56,192	112,433	116,518
Public Service Co Of Oklahoma [Member]
Net Income (Loss)	27,098	22,449	40,783	30,897
OTHER COMPREHENSIVE INCOME
Cash Flow Hedges, Net of Tax	(190)	(190)	(380)	(436)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	(190)	(190)	(380)	(436)
TOTAL COMPREHENSIVE INCOME (LOSS)	26,908	22,259	40,403	30,461
Southwestern Electric Power Co [Member]
Net Income (Loss)	59,426	32,823	106,163	55,785
OTHER COMPREHENSIVE INCOME
Cash Flow Hedges, Net of Tax	567	567	1,134	1,069
Amortization of Pension and OPEB Deferred Costs, Net of Tax	(239)	(235)	(479)	(469)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	328	332	655	600
TOTAL COMPREHENSIVE INCOME (LOSS)	59,754	33,155	106,818	56,385
Total Comprehensive Income Attributable to Noncontrolling Interest	956	1,126	1,989	2,228
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 58,798	$ 32,029	$ 104,829	$ 54,157