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Commitments and Contingencies - Superfund-Related Matters, Southwest Power Outage, Clean Air Act and Four Corners (Details) - APS
$ in Millions
6 Months Ended
Aug. 02, 2021
USD ($)
Jun. 30, 2021
USD ($)
Apr. 05, 2018
plaintiff
Defendant
Dec. 16, 2016
plaintiff
Aug. 06, 2013
Defendant
Jun. 30, 2021
USD ($)
SCE | Four Corners Units 4 and 5            
Loss Contingencies [Line Items]            
Estimated write-off of cost deferrals   $ 75        
SCR plant investments   $ 320       $ 320
SCE | Four Corners Units 4 and 5 | Subsequent Event            
Loss Contingencies [Line Items]            
Disallowance of plant investments $ 399          
Cost deferrals $ 61          
Contaminated groundwater wells            
Loss Contingencies [Line Items]            
Costs related to investigation and study under Superfund site           $ 3
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