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Lines of Credit and Short-Term Borrowings (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Lines of Credit and Short-Term Borrowings    
Amount Committed $ 1,200,000,000 $ 1,200,000,000
Unused Amount 1,047,000,000 1,108,000,000
Long term debt
    
Lines of Credit and Short-Term Borrowings    
Amount Committed 847,000,000 908,000,000
Number of credit facilities 2 2
Pinnacle West
    
Lines of Credit and Short-Term Borrowings    
Outstanding amount of debt 3,340,000,000  
Pinnacle West | Long term debt
    
Lines of Credit and Short-Term Borrowings    
Outstanding amount of debt 0 0
Pinnacle West | Revolving credit facility maturing in 2016
    
Lines of Credit and Short-Term Borrowings    
Amount Committed 200,000,000 200,000,000
Unused Amount 200,000,000 200,000,000
Commitment Fees (as a percent) 0.175% 0.225%
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders 300,000,000 300,000,000
Pinnacle West | Commercial Paper
    
Lines of Credit and Short-Term Borrowings    
Amount Committed 200,000,000 200,000,000
Outstanding amount of debt 0 0
Pinnacle West | Letters of credit
    
Lines of Credit and Short-Term Borrowings    
Outstanding amount of debt 0 0
ARIZONA PUBLIC SERVICE COMPANY
    
Lines of Credit and Short-Term Borrowings    
Amount Committed 1,000,000,000  
Outstanding amount of debt 3,215,000,000  
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders 700,000,000 700,000,000
ARIZONA PUBLIC SERVICE COMPANY | ACC
    
Debt Provisions    
Percentage of APS's capitalization used in calculation of short-term debt authorization 7.00%  
Required amount to be used in purchases of natural gas and power which is used in calculation of short-term debt authorization 500,000,000  
Long-term debt authorization before increase 4,200,000,000  
Long-term debt authorization 5,100,000,000  
ARIZONA PUBLIC SERVICE COMPANY | Long term debt
    
Lines of Credit and Short-Term Borrowings    
Maximum commercial paper support available under credit facility 250,000,000 250,000,000
ARIZONA PUBLIC SERVICE COMPANY | Revolving credit facility maturing in 2016
    
Lines of Credit and Short-Term Borrowings    
Amount Committed 500,000,000 500,000,000
Unused Amount 347,000,000 408,000,000
Commitment Fees (as a percent) 0.125% 0.175%
ARIZONA PUBLIC SERVICE COMPANY | Revolving credit facility maturing in 2015
    
Lines of Credit and Short-Term Borrowings    
Amount Committed   500,000,000
Unused Amount   500,000,000
Commitment Fees (as a percent)   0.20%
ARIZONA PUBLIC SERVICE COMPANY | Revolving credit facility maturing in 2018
    
Lines of Credit and Short-Term Borrowings    
Amount Committed 500,000,000  
Unused Amount 500,000,000  
Commitment Fees (as a percent) 0.125%  
ARIZONA PUBLIC SERVICE COMPANY | Commercial Paper
    
Lines of Credit and Short-Term Borrowings    
Outstanding amount of debt 153,000,000 92,000,000
ARIZONA PUBLIC SERVICE COMPANY | Letters of credit
    
Lines of Credit and Short-Term Borrowings    
Outstanding amount of debt $ 0 $ 0