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Palo Verde Sale Leaseback Variable Interest Entities (Details) (USD $)
12 Months Ended
Dec. 31, 2012
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Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2008
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Palo Verde Sale Leaseback Variable Interest Entities        
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts $ 31,622,000 $ 27,467,000 $ 20,156,000  
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets        
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 128,995,000 132,864,000    
Current maturities of long-term debt 122,828,000 477,435,000    
Palo Verde sale leaseback lessor notes long-term debt excluding current maturities 38,869,000 65,547,000    
Equity-Noncontrolling interests 129,483,000 108,736,000    
ARIZONA PUBLIC SERVICE COMPANY
       
Palo Verde Sale Leaseback Variable Interest Entities        
Number of VIE lessor trusts 3     3
Annual lease payments 49,000,000      
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts 31,613,000 27,524,000 20,163,000  
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets        
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 128,995,000 132,864,000    
Current maturities of long-term debt 122,828,000 477,435,000    
Palo Verde sale leaseback lessor notes long-term debt excluding current maturities 38,869,000 65,547,000    
Equity-Noncontrolling interests 129,483,000 108,399,000    
ARIZONA PUBLIC SERVICE COMPANY | Consolidation of VIEs
       
Palo Verde Sale Leaseback Variable Interest Entities        
Annual lease payment if lease is extended 23,000,000      
Number of options 2      
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts 32,000,000 28,000,000 20,000,000  
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets        
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 129,000,000 133,000,000    
Current maturities of long-term debt 27,000,000 31,000,000    
Palo Verde sale leaseback lessor notes long-term debt excluding current maturities 39,000,000 66,000,000    
Equity-Noncontrolling interests 129,000,000 108,000,000    
Maximum payment to the VIEs' noncontrolling equity participants upon the occurrence of certain unlikely events 139,000,000      
VIE debt to be assumed upon the occurrence of certain unlikely events $ 66,000,000