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Earnings Per Share and Equity Forward Sale Agreements - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2024
Sep. 30, 2024
Sep. 30, 2024
Subsidiary, Sale of Stock [Line Items]      
Antidilutive securities excluded from computation of EPS (in shares)   460,231,000 808,729,000
Pinnacle West | Convertible Notes Due Maturing June 2027 | Convertible Debt      
Subsidiary, Sale of Stock [Line Items]      
Debt instrument, face amount   $ 525 $ 525
Debt instrument, interest rate   4.75% 4.75%
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     $ 725