SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 9,526	$ 26,202	$ 33,583	$ 110,188
Accounts receivable	299,904	277,225
Current deferred income taxes	91,152	152,191
Income tax receivable	135,517	2,423
Other current assets	39,895	37,102
Total current assets	1,043,609	1,005,726
Investments and other assets
Other assets	60,875	62,694
Total investments and other assets	726,697	669,210
TOTAL ASSETS	13,508,686	13,379,615
Current liabilities
Accounts payable	284,516	221,312
Accrued taxes (Note 4)	130,998	124,939
Common dividends payable	62,528	59,789
Other current liabilities	158,540	171,573
Total current liabilities	1,618,644	1,083,542
Long-term debt less current maturities	2,796,465	3,199,088
Deferred credits and other
Deferred income taxes (Note 4)	2,351,882	2,151,371
Pension and other postretirement liabilities	513,628	1,058,755
Other	185,659	183,835
Total deferred credits and other	4,753,117	4,994,696
Common stock equity
Common stock	2,491,558	2,466,923
Accumulated other comprehensive loss	(78,053)	(114,008)
Retained earnings	1,785,273	1,624,102
Total shareholders' equity	4,194,470	3,972,806
Noncontrolling interests	145,990	129,483
Total equity	4,340,460	4,102,289	3,930,586
TOTAL LIABILITIES AND EQUITY	13,508,686	13,379,615
Pinnacle West
Current assets
Cash and cash equivalents	5,798	22,679	12,710	7,725
Accounts receivable	80,108	92,906
Current deferred income taxes	93,185	77,771
Income tax receivable	1,853	3,350
Other current assets	242	25
Total current assets	181,186	196,731
Investments and other assets
Investments in subsidiaries	4,455,049	4,223,301
Other assets	13,789	13,833
Total investments and other assets	4,468,838	4,237,134
TOTAL ASSETS	4,650,024	4,433,865
Current liabilities
Accounts payable	3,279	5,735
Accrued taxes (Note 4)	8,538	8,239
Common dividends payable	62,528	59,789
Other current liabilities	31,295	41,000
Total current liabilities	105,640	114,763
Long-term debt less current maturities	125,000	125,000
Deferred credits and other
Deferred income taxes (Note 4)	4,158	17,395
Pension and other postretirement liabilities	37,611	41,199
Other	37,155	33,219
Total deferred credits and other	78,924	91,813
Common stock equity
Common stock	2,487,250	2,462,712
Accumulated other comprehensive loss	(78,053)	(114,008)
Retained earnings	1,785,273	1,624,102
Total shareholders' equity	4,194,470	3,972,806
Noncontrolling interests	145,990	129,483
Total equity	4,340,460	4,102,289
TOTAL LIABILITIES AND EQUITY	$ 4,650,024	$ 4,433,865