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Palo Verde Sale Leaseback Variable Interest Entities (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
item
Palo Verde Sale Leaseback Variable Interest Entities      
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts $ 8,392,000 $ 7,776,000  
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets      
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 128,027,000   128,995,000
Current maturities of long-term debt 122,828,000   122,828,000
Palo Verde sale leaseback lessor notes long-term debt excluding current maturities 38,869,000   38,869,000
Equity-Noncontrolling interests 137,875,000   129,483,000
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 8,392,000 7,767,000  
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets      
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 128,027,000   128,995,000
Current maturities of long-term debt 122,828,000   122,828,000
Palo Verde sale leaseback lessor notes long-term debt excluding current maturities 38,869,000   38,869,000
Equity-Noncontrolling interests 137,875,000   129,483,000
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 8,000,000 8,000,000  
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets      
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 128,000,000   129,000,000
Current maturities of long-term debt 27,000,000   27,000,000
Palo Verde sale leaseback lessor notes long-term debt excluding current maturities 39,000,000   39,000,000
Equity-Noncontrolling interests 138,000,000   129,000,000
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