Income Taxes (APSC) (Details 3) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Regulatory liabilities:
Asset retirement obligation and removal costs	$ 236,739,000	$ 222,448,000
Deferred fuel and purchased power		23,089,000
Renewable energy standard	19,722,000	18,749,000
Unamortized investment tax credits	31,460,000	642,000
Other	33,155,000	27,718,000
Risk management activities	117,765,000	124,731,000
Pension and other postretirement liabilities	501,202,000	321,182,000
Renewable energy incentives	57,901,000	37,327,000
Credit and loss carryforwards	171,915,000	42,971,000
Other	73,759,000	68,684,000
Total deferred tax assets	1,243,618,000	907,396,000
DEFERRED TAX LIABILITIES
Plant-related	(2,446,908,000)	(2,210,976,000)
Risk management activities	(30,171,000)	(30,125,000)
Regulatory assets:
Allowance for equity funds used during construction	(33,347,000)	(28,276,000)
Deferred fuel and purchased power	(10,884,000)
Deferred fuel and purchased power - mark-to-market	(30,559,000)	(30,276,000)
Pension and other postretirement benefits	(408,716,000)	(264,313,000)
Other	(73,087,000)	(77,078,000)
Other	(4,763,000)	(5,316,000)
Total deferred tax liabilities	(3,038,435,000)	(2,646,360,000)
Deferred income taxes - net	(1,794,817,000)	(1,738,964,000)
ARIZONA PUBLIC SERVICE COMPANY
Regulatory liabilities:
Asset retirement obligation and removal costs	236,739,000	222,448,000
Deferred fuel and purchased power		23,089,000
Renewable energy standard	19,722,000	18,749,000
Unamortized investment tax credits	31,460,000	642,000
Other	33,155,000	27,718,000
Risk management activities	117,765,000	124,731,000
Pension and other postretirement liabilities	494,744,000	303,055,000
Renewable energy incentives	57,901,000	37,327,000
Credit and loss carryforwards	106,668,000
Other	99,176,000	97,989,000
Total deferred tax assets	1,197,330,000	855,748,000
DEFERRED TAX LIABILITIES
Plant-related	(2,446,908,000)	(2,210,976,000)
Risk management activities	(30,171,000)	(30,125,000)
Regulatory assets:
Allowance for equity funds used during construction	(33,347,000)	(28,276,000)
Deferred fuel and purchased power	(10,884,000)
Deferred fuel and purchased power - mark-to-market	(30,559,000)	(30,276,000)
Pension and other postretirement benefits	(408,716,000)	(264,313,000)
Other	(73,087,000)	(77,078,000)
Other	(4,763,000)	(5,316,000)
Total deferred tax liabilities	(3,038,435,000)	(2,646,360,000)
Deferred income taxes - net	(1,841,105,000)	(1,790,612,000)
Amount of federal general business credits carryforwards which begin to expire in 2031	60,000,000
Amount of federal net operating losses carryforwards which begin to expire in 2031	37,000,000
Amount of federal and state loss carryforwards which begin to expire in 2013	$ 10,000,000