CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
NET INCOME	$ 507,949	$ 461,527	$ 456,190
Derivative instruments:
Net unrealized loss, net of tax benefit (expense)	(35)	(538)	(957)
Reclassification of net realized loss, net of tax benefit	2,225	2,941	4,187
Pension and other postretirement benefits activity, net of tax (expense) benefit	(3,370)	(1,477)	20,163
Total other comprehensive income (loss)	(1,180)	926	23,393
COMPREHENSIVE INCOME	506,769	462,453	479,583
Less: Comprehensive income attributable to noncontrolling interests	19,493	19,493	18,933
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	487,276	442,960	460,650
ARIZONA PUBLIC SERVICE COMPANY
NET INCOME	523,802	481,634	469,207
Derivative instruments:
Net unrealized loss, net of tax benefit (expense)	(35)	(538)	(957)
Reclassification of net realized loss, net of tax benefit	2,225	2,941	4,187
Pension and other postretirement benefits activity, net of tax (expense) benefit	(3,750)	(729)	18,006
Total other comprehensive income (loss)	(1,560)	1,674	21,236
COMPREHENSIVE INCOME	522,242	483,308	490,443
Less: Comprehensive income attributable to noncontrolling interests	19,493	19,493	18,933
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 502,749	$ 463,815	$ 471,510