CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net unrealized loss, tax expense	$ 674	$ 546
Reclassification of net realized loss, tax expense	356	200
Pension and other postretirement benefits activity, tax expense	704	645
Arizona Public Service Company
Net unrealized loss, tax expense	674	546
Reclassification of net realized loss, tax expense	356	200
Pension and other postretirement benefits activity, tax expense	$ 590	$ 558