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Earnings Per Share and Equity Forward Sale Agreements - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Feb. 28, 2024
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Subsidiary, Sale of Stock [Line Items]        
Antidilutive securities excluded from computation of EPS (in shares)   0 239,000  
Common stock, issued shares (in shares)   113,686,849   113,537,689
Forward Sale Agreements        
Subsidiary, Sale of Stock [Line Items]        
Sale of stock, issued in transaction (in shares) 11,240,601      
Forward Sale Agreements | Pinnacle West        
Subsidiary, Sale of Stock [Line Items]        
Sale of stock (in dollars per share) $ 64.51      
Sale of stock, settlement terms (in shares)   11,240,601    
Sale of stock, settlement proceeds from issuance of common stock   $ 728