XML 98 R52.htm IDEA: XBRL DOCUMENT v3.7.0.1
Commitments and Contingencies - Palo Verde Nuclear Generating Station and Contractual Obligations (Details)
3 Months Ended
Aug. 18, 2014
USD ($)
Mar. 31, 2017
USD ($)
time_period
power_plant
claim
Dec. 31, 1986
Trust
Commitments and Contingencies      
Purchase obligation, increase (decrease) as a result of variable components   $ 600,000,000  
Breach of Contract for Disposal of Spent Nuclear Fuel and/or High Level Radioactive Waste      
Commitments and Contingencies      
Litigation settlement amount $ 57,400,000    
Proceeds from legal settlements   65,200,000  
Arizona Public Service Company      
Commitments and Contingencies      
Maximum insurance against public liability per occurrence for a nuclear incident (up to)   13,400,000,000  
Maximum available nuclear liability insurance (up to)   450,000,000  
Remaining nuclear liability insurance through mandatory industry wide retrospective assessment program   13,000,000,000  
Maximum retrospective premium assessment per reactor for each nuclear liability incident   127,300,000  
Annual limit per incident with respect to maximum retrospective premium assessment   $ 19,000,000  
Number of VIE lessor trusts   3 3
Maximum potential retrospective assessment per incident of APS   $ 111,100,000  
Annual payment limitation with respect to maximum potential retrospective premium assessment   16,600,000  
Amount of "all risk" (including nuclear hazards) insurance for property damage to, and decontamination of, property at Palo Verde   2,800,000,000  
Maximum amount that APS could incur under the current NEIL policies for each retrospective assessment   24,000,000  
Collateral assurance provided based on rating triggers   $ 64,800,000  
Period to provide collateral assurance based on rating triggers   20 days  
Arizona Public Service Company | Breach of Contract for Disposal of Spent Nuclear Fuel and/or High Level Radioactive Waste      
Commitments and Contingencies      
Litigation settlement amount $ 16,700,000    
Number of claims submitted | claim   3  
Number of settlement agreement time periods | time_period   3  
Proceeds from legal settlements   $ 19,000,000