Commitments and Contingencies (Details 2) (ARIZONA PUBLIC SERVICE COMPANY, USD $)	0 Months Ended	1 Months Ended	12 Months Ended		12 Months Ended						0 Months Ended
	Jan. 22, 2014 item	Sep. 30, 2011 kV item MW	Dec. 31, 2013 item	Sep. 08, 2011	Dec. 31, 2013 Coal take-or-pay commitments	Dec. 31, 2012 Coal take-or-pay commitments	Dec. 31, 2011 Coal take-or-pay commitments	Dec. 31, 2013 Renewable energy credits	Dec. 31, 2013 Coal Mine Reclamation Obligations	Dec. 31, 2012 Coal Mine Reclamation Obligations	Aug. 06, 2013 Contaminated groundwater wells item
Contractual Obligations
2014			$ 729,000,000		$ 152,000,000			$ 48,000,000	$ 1,000,000
2015			628,000,000		157,000,000			42,000,000	1,000,000
2016			638,000,000		166,000,000			42,000,000	8,000,000
2017			613,000,000		180,000,000			42,000,000	14,000,000
2018			580,000,000		175,000,000			42,000,000	14,000,000
Thereafter			8,700,000,000		2,539,000,000			453,000,000	170,000,000
Total commitments					3,400,000,000				207,000,000	119,000,000
Total net present value of commitments					2,200,000,000
Actual purchases under commitment obligations					188,000,000	196,000,000	191,000,000
Superfund
Costs related to investigation and study under Superfund site			2,000,000
Number of defendants against whom Roosevelt Irrigation District ("RID") filed lawsuit											24
Southwest Power Outage
Capacity of transmission line that tripped out of service (in kV)		500
Period, after the transmission line went off-line, over which generation and transmission resources for the Yuma area were lost		10 minutes
Number of customers losing service in Yuma area		69,700
Capacity of firm load that were reported to have been affected due to outages affecting portions of southern Arizona, southern California and northern Mexico (in MW)		7,900
Number of customers that were reported to have been affected due to outages		2,700,000
Number of alleged entities	6
Number of Reliability Standard Requirements Violations alleged	7
Maximum possible fine per violation per day that the violation is found to have been in existence				1,000,000
Financial Assurances
Outstanding letters of credit to support existing variable interest rate pollution control bonds			76,000,000
Number of letters of credit expiring in 2015			1
Number of letters of credit expiring in 2016			2
Letters of credit to support certain equity lessors in the Palo Verde sale leaseback transactions			32,000,000
Outstanding letters of credit to support natural gas tolling contract obligations			$ 55,000,000