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Leases (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
ARIZONA PUBLIC SERVICE COMPANY
item
Dec. 31, 2011
ARIZONA PUBLIC SERVICE COMPANY
Dec. 31, 2010
ARIZONA PUBLIC SERVICE COMPANY
Dec. 31, 2008
ARIZONA PUBLIC SERVICE COMPANY
item
Dec. 31, 1986
Palo Verde Lessor Trusts
item
Leases                
Lease expense $ 19 $ 21 $ 23 $ 16 $ 18 $ 19    
Estimated future minimum lease payments for operating leases, excluding purchased power agreements                
2013 21     18        
2014 17     15        
2015 15     12        
2016 4     4        
2017 3     3        
Thereafter 41     40        
Total future lease commitments $ 101     $ 92        
Number of VIE lessor trusts       3     3 3