Changes in Accumulated Other Comprehensive Loss (APSC) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	$ (104,457)		$ (114,008)
Other comprehensive loss before reclassifications	(145)		(1,882)
Amounts reclassified from accumulated other comprehensive loss	15,267		26,555
Net current period other comprehensive income	15,122	30,843	24,673	32,688
Ending balance	(89,335)		(89,335)
Derivative Instruments
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	(40,319)		(49,592)
Other comprehensive loss before reclassifications	(145)		(247)
Amounts reclassified from accumulated other comprehensive loss	14,310		23,685
Net current period other comprehensive income	14,165		23,438
Ending balance	(26,154)		(26,154)
Pension and other postretirement benefits
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	(64,138)		(64,416)
Other comprehensive loss before reclassifications			(1,635)
Amounts reclassified from accumulated other comprehensive loss	957		2,870
Net current period other comprehensive income	957		1,235
Ending balance	(63,181)		(63,181)
ARIZONA PUBLIC SERVICE COMPANY
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	(79,552)		(89,095)
Other comprehensive loss before reclassifications	(145)		(1,877)
Amounts reclassified from accumulated other comprehensive loss	15,261		26,536
Net current period other comprehensive income	15,116	30,728	24,659	32,090
Ending balance	(64,436)		(64,436)
ARIZONA PUBLIC SERVICE COMPANY \| Derivative Instruments
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	(40,320)		(49,592)
Other comprehensive loss before reclassifications	(145)		(247)
Amounts reclassified from accumulated other comprehensive loss	14,310		23,684
Net current period other comprehensive income	14,165		23,437
Ending balance	(26,155)		(26,155)
ARIZONA PUBLIC SERVICE COMPANY \| Pension and other postretirement benefits
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	(39,232)		(39,503)
Other comprehensive loss before reclassifications			(1,630)
Amounts reclassified from accumulated other comprehensive loss	951		2,852
Net current period other comprehensive income	951		1,222
Ending balance	$ (38,281)		$ (38,281)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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