Income Taxes (Details)	6 Months Ended
	Jun. 30, 2015
Income Taxes (Textuals) [Abstract]
Pre-2016 TX Income/Franchise Tax Rate	0.95%
New TX Income/Franchise Tax Rate	0.75%
Anticipated TX Income/Franchise Tax Rate	1.00%
Public Service Co Of Oklahoma [Member]
Income Taxes (Textuals) [Abstract]
Pre-2016 TX Income/Franchise Tax Rate	0.95%
New TX Income/Franchise Tax Rate	0.75%
Anticipated TX Income/Franchise Tax Rate	1.00%
Southwestern Electric Power Co [Member]
Income Taxes (Textuals) [Abstract]
Pre-2016 TX Income/Franchise Tax Rate	0.95%
New TX Income/Franchise Tax Rate	0.75%
Anticipated TX Income/Franchise Tax Rate	1.00%