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Commitments and Contingencies - Superfund-Related Matters, Southwest Power Outage, Clean Air Act and Four Corners (Details) - APS
$ in Millions
9 Months Ended
Nov. 02, 2021
USD ($)
Oct. 27, 2021
USD ($)
Sep. 30, 2021
USD ($)
Aug. 02, 2021
USD ($)
Apr. 05, 2018
plaintiff
defendant
Dec. 16, 2016
plaintiff
Aug. 06, 2013
defendant
Sep. 30, 2021
USD ($)
SCE | Four Corners Units 4 and 5                
Loss Contingencies [Line Items]                
Disallowance of plant investments       $ 399.0        
Cost deferrals       $ 61.0        
Estimated write-off of cost deferrals     $ 77.0          
SCR plant investments     $ 331.0         $ 331.0
SCE | Four Corners Units 4 and 5 | Subsequent Event                
Loss Contingencies [Line Items]                
Disallowance of plant investments   $ 194.0            
Cost deferrals $ 215.5 $ 215.5            
Contaminated groundwater wells                
Loss Contingencies [Line Items]                
Costs related to investigation and study under Superfund site               $ 3.0
Number of defendants against whom Roosevelt Irrigation District (RID) filed lawsuit | defendant         28   24  
Number of plaintiffs | plaintiff           2    
Settled Litigation | Contaminated groundwater wells                
Loss Contingencies [Line Items]                
Number of plaintiffs | plaintiff         2