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Earnings Per Share and Equity Forward Sale Agreements - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 28, 2024 | Jun. 30, 2024 | Jun. 30, 2024
Subsidiary, Sale of Stock [Line Items] |  |  |
Antidilutive securities excluded from computation of EPS (in shares) |  | 348,499,000 | 348,499,000
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 |  |  | $ 726

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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