Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Cash Flow Hedges, Tax	$ (3,000)	$ (1,000)	$ (6,000)	$ 3,000
Securities Available for Sale, Tax	(1,000)	0	(1,000)	0
Amortization of Pension and OPEB Deferred Costs, Tax	0	1,000	0	2,000
Appalachian Power Co [Member]
Cash Flow Hedges, Tax	(120)	92	(49)	314
Amortization of Pension and OPEB Deferred Costs, Tax	(247)	(179)	(740)	(538)
Indiana Michigan Power Co [Member]
Cash Flow Hedges, Tax	144	220	432	638
Amortization of Pension and OPEB Deferred Costs, Tax	6	22	18	68
Ohio Power Co [Member]
Cash Flow Hedges, Tax	(185)	(185)	(555)	(611)
Public Service Co Of Oklahoma [Member]
Cash Flow Hedges, Tax	(101)	(102)	(306)	(337)
Southwestern Electric Power Co [Member]
Cash Flow Hedges, Tax	232	305	843	881
Amortization of Pension and OPEB Deferred Costs, Tax	$ (129)	$ (126)	$ (387)	$ (379)