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Regulatory Matters - Four Corners, Cholla and Navajo Plant (Details) - Arizona Public Service Company - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 02, 2021
Sep. 30, 2018
Apr. 30, 2018
Dec. 31, 2022
Aug. 02, 2021
Coal Community Transition Plan | Navajo Nation, Economic Development Organization | Retail Rate Case Filing with Arizona Corporation Commission | ACC          
Acquisition          
Disallowance of annual amortization percentage         15.00%
Retired power plant costs          
Acquisition          
Net book value       $ 37.2  
Navajo Plant          
Acquisition          
Net book value       52.6  
Navajo Plant, Coal Reclamation Regulatory Asset          
Acquisition          
Net book value       13.9  
SCE | Four Corners Units 4 and 5          
Acquisition          
Settlement agreement, ACC approved rate adjustment, annualized customer impact   $ 58.5 $ 67.5    
Disallowance of plant investments $ 194.0        
Cost deferrals $ 215.5        
Amount not recoverable       $ 154.4