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Income Taxes (Details) - USD ($)
12 Months Ended
Apr. 04, 2013
Feb. 17, 2011
Dec. 31, 2016
Income Taxes      
Interest income to be received on the overpayment of income taxes for certain adjustments that we have filed, or will file, with the IRS (less than)     $ 1,000,000
General business tax credit carryforwards that will begin to expire in 2031     98,000,000
Amount of federal and state loss carryforwards which will begin to expire in 2019     5,000,000
increase (decrease) in deferred income taxes due to regulation adoption     27,000,000
ARIZONA | State Jurisdiction | ARIZONA PUBLIC SERVICE COMPANY      
Income Taxes      
Phase-in period of corporate income tax rate reductions beginning in 2014   4 years  
Decrease in long term deferred tax liability due to rate changes     74,000,000
NEW MEXICO | State Jurisdiction | ARIZONA PUBLIC SERVICE COMPANY      
Income Taxes      
Phase-in period of corporate income tax rate reductions beginning in 2014 5 years    
Decrease in long term deferred tax liability due to rate changes     2,000,000
Palo Verde VIE      
Income Taxes      
Income tax expense benefit attributable to non controlling interests     $ 0