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Commitments and Contingencies - Additional Information (Details)
$ in Thousands
9 Months Ended 12 Months Ended 108 Months Ended
Oct. 31, 2022
claim
Sep. 30, 2022
USD ($)
Nov. 02, 2021
USD ($)
Nov. 01, 2021
USD ($)
Feb. 22, 2021
USD ($)
Jul. 03, 2018
USD ($)
Jul. 06, 2016
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Trust
Jun. 30, 2020
USD ($)
timePeriod
claim
Feb. 11, 2022
USD ($)
Financial Assurances                      
Production tax credit guarantees                 $ 34,000    
Arizona Public Service Company                      
Palo Verde Nuclear Generating Station [Abstract]                      
Maximum insurance against public liability per occurrence for a nuclear incident                 13,700,000    
Maximum available nuclear liability insurance                 450,000    
Remaining nuclear liability insurance through mandatory industry wide retrospective assessment program                 13,200,000    
Maximum assessment per reactor for each nuclear incident                 137,600    
Annual limit per incident with respect to maximum assessment                 $ 20,500    
Number of VIE lessor trusts | Trust                 3    
Maximum potential retrospective assessment per incident of APS                 $ 120,100    
Annual payment limitation with respect to maximum potential retrospective assessment                 17,900    
Amount of "all risk" (including nuclear hazards) insurance for property damage to, and decontamination of, property at Palo Verde                 2,800,000    
Request second-year energy price for exported energy                 22,300    
Collateral assurance based on rating triggers                 $ 62,800    
Period to provide collateral assurance based on rating triggers                 20 days    
Arizona Public Service Company | Contaminated Groundwater Wells                      
Palo Verde Nuclear Generating Station [Abstract]                      
Costs claimed               $ 21,000      
Arizona Public Service Company | Pending Litigation | Contaminated Groundwater Wells                      
Arizona Attorney General [Abstract]                      
Settlement amount   $ 20,700                  
Bright Canyon Energy Corporation | Clear Creek Wind Farm                      
BCE Matters [Abstract]                      
Equity method investments   $ 17,100           $ 17,100 $ 0    
Impairment of equity method investments                 12,800    
2017 Settlement Agreement and its Customer Education and Outreach Plan | Arizona Public Service Company                      
Arizona Attorney General [Abstract]                      
Settlement amount         $ 24,750            
Settlement amount returned to customers         $ 24,000            
Arizona Public Service Company and Palo Verde Owners vs. United States Department of Energy - Spent Nuclear Fuel and Waste Disposal                      
Palo Verde Nuclear Generating Station [Abstract]                      
Settlement amount, awarded to company       $ 14,300           $ 123,900  
Arizona Public Service Company and Palo Verde Owners vs. United States Department of Energy - Spent Nuclear Fuel and Waste Disposal | Arizona Public Service Company                      
Palo Verde Nuclear Generating Station [Abstract]                      
Gain contingency, new claims filed, number | claim 9                 8  
Gain contingency, number of settlement agreement time periods | timePeriod                   8  
Settlement amount, awarded to company       $ 4,200           $ 36,000  
Letter of Credit | Arizona Public Service Company                      
Financial Assurances                      
Outstanding letters of credit                 10,000    
Bridge Loan | Bright Canyon Energy Corporation | Pinnacle West                      
Financial Assurances                      
Debt guarantee                     $ 42,000
Four Corners Units 4 and 5 | Arizona Public Service Company | SCE                      
Four Corners SCR Cost Recovery [Abstract]                      
Disallowance of plant investments     $ 194,000                
Cost deferrals     $ 215,500                
Amount not recoverable                 $ 154,400    
Four Corners | NTEC                      
Environmental Matters                      
Option to purchase, ownership interest (as a percent)           7.00% 7.00%        
Payment received for coal supply agreement           $ 70,000          
Financial Assurances                      
Option to purchase, ownership interest (as a percent)           7.00%          
Four Corners | 4CA                      
Environmental Matters                      
Percentage share cost of control             7.00%        
Regional Haze Rules | Four Corners Units 4 and 5 | Arizona Public Service Company                      
Environmental Matters                      
Percentage share cost of control                 63.00%    
Expected environmental cost                 $ 400,000    
Regional Haze Rules | Four Corners Units 4 and 5 | Four Corners | Arizona Public Service Company                      
Environmental Matters                      
Additional expected environment cost                 $ 45,000    
Regional Haze Rules | Four Corners Units 4 and 5 | Natural Gas Tolling Letter of Credit | Arizona Public Service Company                      
Environmental Matters                      
Additional percentage share of cost of control                 7.00%    
Coal Combustion Waste | Four Corners | Arizona Public Service Company                      
Environmental Matters                      
Additional expected environment cost                 $ 30,000    
Coal Combustion Waste | Navajo Generating Station | Arizona Public Service Company                      
Environmental Matters                      
Additional expected environment cost                 1,000    
Coal Combustion Waste | Minimum | Cholla | Arizona Public Service Company                      
Environmental Matters                      
Additional expected environment cost                 16,000    
Coal Combustion Waste | Minimum | Cholla and Four Corners | Arizona Public Service Company                      
Environmental Matters                      
Additional expected environment cost                 10,000    
Coal Combustion Waste | Maximum | Cholla and Four Corners | Arizona Public Service Company                      
Environmental Matters                      
Additional expected environment cost                 15,000    
Surety Bonds Expiring in 2025 | Arizona Public Service Company                      
Financial Assurances                      
Surety bonds expiring, amount                 $ 8,000