CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net unrealized loss, tax expense	$ 4	$ 80	$ 679	$ 626
Reclassification of net realized loss, tax expense (benefit)	(348)	(392)	8	(191)
Pension and other postretirement benefits activity, tax benefit (expense)	823	439	119	(206)
Arizona Public Service Company
Net unrealized loss, tax expense	4	80	679	626
Reclassification of net realized loss, tax expense (benefit)	(348)	(392)	8	(191)
Pension and other postretirement benefits activity, tax benefit (expense)	$ 808	$ 403	$ 218	$ (156)