CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 414,161,000	$ 407,152,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	371,722,000	377,971,000
Deferred fuel and purchased power	(26,880,000)	13,093,000
Deferred fuel and purchased power amortization	31,724,000	23,158,000
Allowance for equity funds used during construction	(21,979,000)	(18,698,000)
Deferred income taxes	136,777,000	256,132,000
Deferred investment tax credit	25,206,000	16,164,000
Change in derivative instruments fair value	300,000	537,000
Changes in current assets and liabilities:
Customer and other receivables	(149,053,000)	(178,029,000)
Accrued unbilled revenues	(59,240,000)	(37,710,000)
Materials, supplies and fossil fuel	(3,346,000)	(8,914,000)
Income tax receivable	135,517,000	(131,128,000)
Other current assets	(4,428,000)	(12,246,000)
Accounts payable	(7,171,000)	44,704,000
Accrued taxes	118,934,000	58,919,000
Other current liabilities	48,407,000	4,096,000
Change in margin and collateral accounts — assets	(475,000)	(327,000)
Change in margin and collateral accounts — liabilities	(20,875,000)	15,000,000
Change in long-term income tax receivable	0	137,270,000
Change in unrecognized tax benefits	1,744,000	(57,585,000)
Change in other long-term assets	(50,005,000)	(24,345,000)
Change in other long-term liabilities	(54,122,000)	(2,884,000)
Net cash flow provided by operating activities	886,918,000	882,330,000
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(618,658,000)	(581,515,000)
Contributions in aid of construction	8,537,000	34,910,000
Allowance for borrowed funds used during construction	(11,039,000)	(10,861,000)
Proceeds from nuclear decommissioning trust sales	269,276,000	363,944,000
Investment in nuclear decommissioning trust	(282,212,000)	(376,881,000)
Other	339,000	(1,553,000)
Net cash flow used for investing activities	(633,757,000)	(571,956,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	574,126,000	136,307,000
Repayment of long-term debt	(503,583,000)	(72,777,000)
Short-term borrowings and payments — net	(133,975,000)	(92,175,000)
Dividends paid on common stock	(187,778,000)	(174,485,000)
Dividends paid on common stock	14,860,000	10,396,000
Distributions to noncontrolling interests	(15,869,000)	(9,197,000)
Other	3,000	812,000
Net cash flow used for financing activities	(252,216,000)	(201,119,000)
NET INCREASE IN CASH AND CASH EQUIVALENTS	945,000	109,255,000
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	9,526,000	26,202,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD	10,471,000	135,457,000
Cash paid (received) during the period for:
Income taxes, net of refunds	(131,154,000)	3,412,000
Interest, net of amounts capitalized	145,285,000	141,047,000
Significant non-cash investing and financing activities:
Accrued capital expenditures	24,135,000	11,377,000
Arizona Public Service Company
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	427,460,000	420,283,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	371,651,000	377,899,000
Deferred fuel and purchased power	(26,880,000)	13,093,000
Deferred fuel and purchased power amortization	31,724,000	23,158,000
Allowance for equity funds used during construction	(21,979,000)	(18,698,000)
Deferred income taxes	77,435,000	256,253,000
Deferred investment tax credit	25,206,000	16,164,000
Change in derivative instruments fair value	300,000	537,000
Changes in current assets and liabilities:
Customer and other receivables	(149,725,000)	(179,494,000)
Accrued unbilled revenues	(59,240,000)	(37,710,000)
Materials, supplies and fossil fuel	(3,346,000)	(8,914,000)
Income tax receivable	135,179,000	(125,509,000)
Other current assets	(4,575,000)	(11,449,000)
Accounts payable	(10,055,000)	43,886,000
Accrued taxes	178,186,000	61,649,000
Other current liabilities	55,127,000	1,073,000
Change in margin and collateral accounts — assets	(474,000)	(327,000)
Change in margin and collateral accounts — liabilities	(20,875,000)	15,000,000
Change in long-term income tax receivable	0	137,665,000
Change in unrecognized tax benefits	1,744,000	(57,585,000)
Change in other long-term assets	(49,635,000)	(28,686,000)
Change in other long-term liabilities	(54,940,000)	691,000
Net cash flow provided by operating activities	902,288,000	898,979,000
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(618,658,000)	(581,515,000)
Contributions in aid of construction	8,537,000	34,910,000
Allowance for borrowed funds used during construction	(11,039,000)	(10,861,000)
Proceeds from nuclear decommissioning trust sales	269,276,000	363,944,000
Investment in nuclear decommissioning trust	(282,212,000)	(376,881,000)
Other	339,000	(1,561,000)
Net cash flow used for investing activities	(633,757,000)	(571,964,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	574,126,000	136,307,000
Repayment of long-term debt	(503,583,000)	(72,777,000)
Short-term borrowings and payments — net	(133,975,000)	(92,175,000)
Dividends paid on common stock	(187,800,000)	(179,600,000)
Distributions to noncontrolling interests	(15,869,000)	(9,197,000)
Net cash flow used for financing activities	(267,101,000)	(217,442,000)
NET INCREASE IN CASH AND CASH EQUIVALENTS	1,430,000	109,573,000
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	3,725,000	3,499,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD	5,155,000	113,072,000
Cash paid (received) during the period for:
Income taxes, net of refunds	(119,440,000)	3,412,000
Interest, net of amounts capitalized	142,364,000	138,626,000
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 24,135,000	$ 11,377,000