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Palo Verde Sale Leaseback Variable Interest Entities (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Palo Verde Sale Leaseback Variable Interest Entities      
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts $ 7,776,000 $ 5,461,000  
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets      
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 131,897,000   132,864,000
Current maturities of long-term debt 101,708,000   477,435,000
Palo Verde sale leaseback lessor notes long-term debt excluding current maturities 65,547,000   65,547,000
Equity-Noncontrolling interests 116,512,000   108,736,000
ARIZONA PUBLIC SERVICE COMPANY
     
Palo Verde Sale Leaseback Variable Interest Entities      
Number of VIE lessor trusts 3    
Annual lease payments 49,000,000    
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts 7,767,000 5,470,000  
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets      
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 131,897,000   132,864,000
Current maturities of long-term debt 101,708,000   477,435,000
Palo Verde sale leaseback lessor notes long-term debt excluding current maturities 65,547,000   65,547,000
Equity-Noncontrolling interests 116,166,000   108,399,000
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 8,000,000 5,000,000  
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets      
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 132,000,000   133,000,000
Current maturities of long-term debt 31,000,000   31,000,000
Palo Verde sale leaseback lessor notes long-term debt excluding current maturities 66,000,000   66,000,000
Equity-Noncontrolling interests 116,000,000   108,000,000
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