Income Taxes Income Taxes - Deferred Income Tax Liability Recognized on the Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Net deferred income tax liability recognized on the Consolidated Balance Sheets
Deferred tax asset, current	$ 0	$ 122,232
Long-term liability	(2,723,425)	(2,582,636)
Deferred income taxes — net	(2,723,425)	(2,460,404)
ARIZONA PUBLIC SERVICE COMPANY
Net deferred income tax liability recognized on the Consolidated Balance Sheets
Deferred tax asset, current	0	55,253
Long-term liability	(2,764,489)	(2,571,365)
Deferred income taxes — net	$ (2,764,489)	$ (2,516,112)