CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (APSC) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension and other postretirement benefits (Note 8):
Unrealized actuarial loss, net of tax benefit	$ (6,067)	$ (7,738)	$ (4,223)
Amortization to income:
Actuarial loss, net of tax benefit	1,950	1,870	1,705
Prior service cost, tax benefit	179	201	215
Derivative instruments:
Net unrealized gain (loss), net of tax	(37,389)	(61,348)	(61,329)
Reclassification of net realized (gain) loss to income, net of tax (expense) benefit	46,288	48,453	72,877
ARIZONA PUBLIC SERVICE COMPANY
Pension and other postretirement benefits (Note 8):
Unrealized actuarial loss, net of tax benefit	(3,828)	(6,344)	(2,938)
Amortization to income:
Actuarial loss, net of tax benefit	1,724	1,658	1,387
Prior service cost, tax benefit	194	193	190
Derivative instruments:
Net unrealized gain (loss), net of tax	(37,397)	(61,358)	(61,317)
Reclassification of net realized (gain) loss to income, net of tax (expense) benefit	$ 46,298	$ 48,462	$ 73,261