CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
NET INCOME	$ 344,104	$ 351,245	$ 604,054	$ 584,570
Derivative instruments:
Net unrealized gain (loss), net of tax benefit (expense)	(194)	(659)	938	(1,916)
Reclassification of net realized gain, net of tax expense	0	0	0	282
Pension and other postretirement benefit activity, net of tax expense	1,106	1,043	2,192	1,239
Total other comprehensive income	912	384	3,130	(395)
COMPREHENSIVE INCOME	345,016	351,629	607,184	584,175
Less: Comprehensive income attributable to noncontrolling interests	4,306	4,873	12,918	14,620
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	340,710	346,756	594,266	569,555
APS
NET INCOME	347,969	355,236	611,616	597,446
Derivative instruments:
Net unrealized gain (loss), net of tax benefit (expense)	0	0	0	292
Reclassification of net realized gain, net of tax expense	0	0	0	282
Pension and other postretirement benefit activity, net of tax expense	1,000	900	2,086	823
Total other comprehensive income	1,000	900	2,086	1,397
COMPREHENSIVE INCOME	348,969	356,136	613,702	598,843
Less: Comprehensive income attributable to noncontrolling interests	4,306	4,873	12,918	14,620
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 344,663	$ 351,263	$ 600,784	$ 584,223