Income Taxes (APSC) (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Regulatory liabilities:
Asset retirement obligation and removal costs	$ 235,959	$ 238,669
Unamortized investment tax credits	82,116	53,837
Other	42,609	33,764
Risk management activities	44,920	72,243
Pension and other postretirement liabilities	198,642	408,764
Renewable energy incentives	65,434	66,941
Credit and loss carryforwards	133,070	139,022
Other	148,492	68,844
Total deferred tax assets	951,242	1,082,084
DEFERRED TAX LIABILITIES
Plant-related	(2,903,730)	(2,584,166)
Risk management activities	(16,191)	(23,940)
Regulatory assets:
Allowance for equity funds used during construction	(43,058)	(37,899)
Deferred fuel and purchased power	(8,282)	(28,858)
Deferred fuel and purchased power - mark-to-market	(13,343)	(15,796)
Pension and other postretirement benefits	(129,250)	(316,757)
Other	(93,202)	(68,170)
Other	(4,916)	(5,678)
Total deferred tax liabilities	(3,211,972)	(3,081,264)
Deferred income taxes - net	(2,260,730)	(1,999,180)
ARIZONA PUBLIC SERVICE COMPANY
Regulatory liabilities:
Asset retirement obligation and removal costs	235,959	238,669
Unamortized investment tax credits	82,116	53,837
Other	42,609	33,764
Risk management activities	44,920	72,243
Pension and other postretirement liabilities	186,213	392,486
Renewable energy incentives	65,434	66,941
Credit and loss carryforwards	38,183	52,441
Other	166,781	111,327
Total deferred tax assets	862,215	1,021,708
DEFERRED TAX LIABILITIES
Plant-related	(2,903,730)	(2,584,166)
Risk management activities	(16,191)	(23,940)
Regulatory assets:
Allowance for equity funds used during construction	(43,058)	(37,899)
Deferred fuel and purchased power	(8,282)	(28,858)
Deferred fuel and purchased power - mark-to-market	(13,343)	(15,796)
Pension and other postretirement benefits	(129,250)	(316,757)
Other	(93,202)	(68,170)
Other	(4,916)	(5,678)
Total deferred tax liabilities	(3,211,972)	(3,081,264)
Deferred income taxes - net	$ (2,349,757)	$ (2,059,556)