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Palo Verde Sale Leaseback Variable Interest Entities (Details) (USD $)
12 Months Ended
Dec. 31, 2011
trust
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
trust
Palo Verde Sale Leaseback Variable Interest Entities        
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts $ 27,467,000 $ 20,156,000 $ 4,434,000  
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets        
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 132,864,000 137,956,000    
Current maturities of long-term debt 477,435,000 631,879,000    
Palo Verde sale leaseback lessor notes long-term debt excluding current maturities 65,547,000 96,803,000    
Equity-Noncontrolling interests 108,736,000 91,899,000    
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 (27,524,000) (20,163,000) (19,209,000)  
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets        
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 132,864,000 137,956,000    
Current maturities of long-term debt 477,435,000 456,879,000    
Palo Verde sale leaseback lessor notes long-term debt excluding current maturities 65,547,000 96,803,000    
Equity-Noncontrolling interests 108,399,000 91,084,000    
ARIZONA PUBLIC SERVICE COMPANY | Consolidation of VIEs
       
Palo Verde Sale Leaseback Variable Interest Entities        
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts 28,000,000 20,000,000 19,000,000  
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets        
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 133,000,000 137,956,000    
Current maturities of long-term debt 31,000,000 29,000,000    
Palo Verde sale leaseback lessor notes long-term debt excluding current maturities 66,000,000 96,803,000    
Equity-Noncontrolling interests 108,000,000 91,084,000    
Maximum payment to the VIEs' noncontrolling equity participants upon the occurrence of certain unlikely events 141,000,000      
VIE debt to be assumed upon the occurrence of certain unlikely events $ 97,000,000