| **Regulatory Matters - Retail Rate Case Filing (Details)**                                                                                                  | Mar. 31, 2022 MW | Dec. 17, 2021 USD ($) | Oct. 27, 2021 USD ($) | Aug. 02, 2021 USD ($) | Nov. 06, 2020 USD ($) | Oct. 31, 2019 USD ($) $ / kWh MW | Jun. 30, 2019 USD ($) | Aug. 13, 2018 USD ($) | Mar. 27, 2017 USD ($) $ / kWh | Apr. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 04, 2020 USD ($) | Oct. 02, 2020 USD ($) |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------|-----------------------|-----------------------|-----------------------|-----------------------|----------------------------------|-----------------------|-----------------------|-------------------------------|-----------------------|-----------------------|-----------------------|-----------------------|-----------------------|
| ACC                                                                                                                                                         |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Revenue increase (decrease)                                                                                                                                 |             |                  |                  |                  | $ 169,000,000         |                             |                  |                  |                          |                  |                  |                  | $ 59,800,000          | $ 89,700,000          |
| Average annual customer bill increase (decrease), percent                                                                                                   |             |                  |                  |                  | 5.14%                 |                             |                  |                  |                          |                  |                  |                  | 1.82%                 | 2.70%                 |
| Recommended return on equity, percentage                                                                                                                    |             |                  |                  |                  | 10.00%                |                             |                  |                  |                          |                  |                  |                  |                  | 9.40%                 |
| Alternative, percentage                                                                                                                                     |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  | 0.30%                 |
| Increment of fair value rate, percentage                                                                                                                    |             |                  |                  |                  | 0.80%                 |                             |                  |                  |                          |                  |                  |                  |                  | 0.00%                 |
| Residential Utility Consumer Office                                                                                                                         |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Revenue increase (decrease)                                                                                                                                 |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  | $ (50,100,000)        | $ (20,800,000)        |
| Average annual customer bill increase (decrease), percent                                                                                                   |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  | (1.52%)               | (0.63%)               |
| Recommended return on equity, percentage                                                                                                                    |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  | 8.74%                 |
| Increment of fair value rate, percentage                                                                                                                    |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  | 0.00%                 |
| ACC | APS                                                                                                                                                   |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Proposed annual revenue increase                                                                                                                            |             |                  |                  |                  |                  | $ 184,000,000                    |                  | $ (86,500,000)        |                          |                  |                  |                  |                  |                  |
| Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS                                                                                     |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Base rate decrease, elimination of tax expense adjustment mechanism                                                                                         |             |                  |                  |                  |                  | $ 115,000,000                    |                  |                  |                          |                  |                  |                  |                  |                  |
| Approximate percentage of increase in average customer bill                                                                                                 |             |                  |                  |                  |                  | 5.60%                            |                  |                  |                          |                  |                  |                  |                  |                  |
| Approximate percentage of increase in average residential customer bill                                                                                     |             |                  |                  |                  |                  | 5.40%                            |                  |                  |                          |                  |                  |                  |                  |                  |
| Rate matter, cost base rate                                                                                                                                 |             |                  |                  |                  |                  |                             | $ 8,870,000,000       |                  |                          |                  |                  |                  |                  |                  |
| Base fuel rate (in dollars per kWh) | $ / kWh                                                                                                               |             |                  |                  |                  |                  | 0.030168                         |                  |                  |                          |                  |                  |                  |                  |                  |
| Funding limited income crisis bill program                                                                                                                  |             |                  |                  |                  |                  | $ 1,250,000                      |                  |                  |                          |                  |                  |                  |                  |                  |
| Commercial customers, market pricing, threshold | MW                                                                                                        | 280              |                  |                  |                  |                  | 0.02                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Revenue increase (decrease)                                                                                                                                 |             |                  |                  | $ (111,000,000)       |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Recommended return on equity, percentage                                                                                                                    |             |                  | 8.70%                 | 9.16%                 |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Increment of fair value rate, percentage                                                                                                                    |             |                  |                  | 0.30%                 |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Reduction on equity percentage                                                                                                                              |             |                  |                  | 0.03%                 |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Effective fair value percentage                                                                                                                             |             |                  |                  | 4.95%                 |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Net retail base rate, increase                                                                                                                              |             |                  |                  |                  |                  |                             |                  |                  | $ 94,600,000                  |                  |                  |                  |                  |                  |
| Non-fuel and non-depreciation base rate, increase                                                                                                           |             |                  |                  |                  |                  |                             |                  |                  | 87,200,000                    |                  |                  |                  |                  |                  |
| Fuel-related base rate decrease                                                                                                                             |             |                  |                  |                  |                  |                             |                  |                  | 53,600,000                    |                  |                  |                  |                  |                  |
| Base rate increase, changes in depreciation schedules                                                                                                       |             |                  |                  |                  |                  |                             |                  |                  | $ 61,000,000                  |                  |                  |                  |                  |                  |
| Authorized return on common equity (as a percent)                                                                                                           |             |                  |                  |                  |                  |                             |                  |                  | 10.00%                        |                  |                  |                  |                  |                  |
| Percentage of debt in capital structure                                                                                                                     |             |                  |                  |                  |                  |                             |                  |                  | 44.20%                        |                  |                  |                  |                  |                  |
| Percentage of common equity in capital structure                                                                                                            |             |                  |                  |                  |                  |                             |                  |                  | 55.80%                        |                  |                  |                  |                  |                  |
| Rate matter, resource comparison proxy for exported energy (in dollars per kWh) | $ / kWh                                                                   |             |                  |                  |                  |                  |                             |                  |                  | 0.129                         |                  |                  |                  |                  |                  |
| AZ Sun Program Phase 2 | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS                                                            |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Public utilities, minimum annual renewable energy standard and tariff                                                                                       |             |                  |                  |                  |                  |                             |                  |                  | $ 10,000,000                  |                  |                  |                  |                  |                  |
| Public utilities, maximum annual renewable energy standard and tariff                                                                                       |             |                  |                  |                  |                  |                             |                  |                  | $ 15,000,000                  |                  |                  |                  |                  |                  |
| Coal Community Transition Plan | ACC                                                                                                                        |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by customers                                                                                                                                  |             |                  |                  |                  | $ 100,000,000         |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by customers, term                                                                                                                            |             |                  |                  |                  | 10 years              |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders                                                                                                                               |             |                  |                  |                  | $ 25,000,000          |                             |                  |                  |                          |                  |                  | $ 25,000,000          |                  |                  |
| Coal Community Transition Plan | ACC | Navajo Nation, Economic Development Organization                                                                     |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders                                                                                                                               |             |                  |                  |                  | $ 1,250,000           |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders, term                                                                                                                         |             |                  |                  |                  | 5 years               |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Coal Community Transition Plan | ACC | Navajo Nation, Electrification Projects                                                                              |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by customers                                                                                                                                  |             |                  |                  |                  | $ 10,000,000          |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders                                                                                                                               |             |                  |                  |                  | 10,000,000            |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Coal Community Transition Plan | ACC | Navajo Nation, Electrification Projects | Subsequent Event                                                           |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders                                                                                                                               |             |                  |                  |                  |                  |                             |                  |                  |                          | $ 500,000             |                  |                  |                  |                  |
| Coal Community Transition Plan | ACC | Navajo Nation, Transmission Revenue Sharing                                                                          |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders                                                                                                                               |             |                  |                  |                  | 2,500,000             |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Coal Community Transition Plan | ACC | Navajo County Communities                                                                                            |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by customers                                                                                                                                  |             |                  |                  |                  | $ 12,000,000          |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by customers, term                                                                                                                            |             |                  |                  |                  | 5 years               |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Coal Community Transition Plan | ACC | Navajo Nation, Generation Station                                                                                    |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by customers                                                                                                                                  |             |                  |                  |                  | $ 3,700,000           |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Coal Community Transition Plan | ACC | Navajo Nation, Hopi Tribe | Subsequent Event                                                                         |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount recoverable through rates related to the CCT                                                                                                         |             |                  |                  |                  |                  |                             |                  |                  |                          | 1,000,000             |                  |                  |                  |                  |
| Coal Community Transition Plan | ACC | Navajo Nation | Subsequent Event                                                                                     |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount recoverable through rates related to the CCT                                                                                                         |             |                  |                  |                  |                  |                             |                  |                  |                          | 3,330,000             |                  |                  |                  |                  |
| Coal Community Transition Plan | ACC | Navajo Nation, Hopi Reservation | Subsequent Event                                                                   |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount recoverable through rates related to the CCT                                                                                                         |             |                  |                  |                  |                  |                             |                  |                  |                          | 1,250,000             |                  |                  |                  |                  |
| Coal Community Transition Plan | ACC | Navajo Nation, Navajo Plant                                                                                          |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by customers                                                                                                                                  |             |                  |                  |                  |                  |                             |                  |                  |                          |                  | $ 900,000             |                  |                  |                  |
| Coal Community Transition Plan | ACC | Navajo County Communities | Subsequent Event                                                                         |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount recoverable through rates related to the CCT                                                                                                         |             |                  |                  |                  |                  |                             |                  |                  |                          | 500,000               |                  |                  |                  |                  |
| Coal Community Transition Plan | ACC | Navajo County Communities, CCT and Economic Development | Subsequent Event                                           |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders                                                                                                                               |             |                  |                  |                  |                  |                             |                  |                  |                          | 1,100,000             |                  |                  |                  |                  |
| Coal Community Transition Plan | ACC | Navajo Nation, Hopi Tribe for CCT and Economic Development | Subsequent Event                                        |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders                                                                                                                               |             |                  |                  |                  |                  |                             |                  |                  |                          | $ 1,250,000           |                  |                  |                  |                  |
| Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Navajo Nation, Economic Development Organization |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Disallowance of annual amortization percentage                                                                                                              |             |                  |                  | 15.00%                |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by customers                                                                                                                                  |             |                  |                  | $ 50,000,000          |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by customers, term                                                                                                                            |             |                  |                  | 10 years              |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Navajo County Communities                        |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders                                                                                                                               |             |                  | $ 500,000             | $ 5,000,000           |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders, term                                                                                                                         |             |                  | 60 days               | 5 years               |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Navajo Nation, Hopi Tribe                        |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount not recoverable                                                                                                                                      |             |                  | $ 215,500,000         |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders                                                                                                                               |             |                  | $ 1,000,000           | $ 1,675,000           |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders, term                                                                                                                         |             |                  | 60 days               |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Navajo Nation                                    |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders                                                                                                                               |             |                  | $ 10,000,000          |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders, term                                                                                                                         |             |                  | 3 years               |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Navajo Nation, Hopi Reservation                  |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders                                                                                                                               |             |                  | $ 1,250,000           |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Navajo Nation Reservation                        |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Revenue increase (decrease)                                                                                                                                 |             |                  | 4,800,000             |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Amount funded by shareholders                                                                                                                               |             |                  | $ 1,250,000           |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Disallowance of plant investments                                                                                                                           |             | $ 215,000,000         |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Minimum | ACC | APS                                                                                                                                         |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Annual increase in retail base rates                                                                                                                        |             |                  |                  |                  |                  | $ 69,000,000                     |                  |                  |                          |                  |                  |                  |                  |                  |
| Minimum | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS                                                                           |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Rate matter, environmental surcharge cap rate (in dollars per kWh) | $ / kWh                                                                                |             |                  |                  |                  |                  |                             |                  |                  | 0.00016                       |                  |                  |                  |                  |                  |
| Maximum | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS                                                                           |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| **Public Utilities, General Disclosures [Line Items]**                                                                                                      |             |                  |                  |                  |                  |                             |                  |                  |                          |                  |                  |                  |                  |                  |
| Rate matter, environmental surcharge cap rate (in dollars per kWh) | $ / kWh                                                                                |             |                  |                  |                  |                  |                             |                  |                  | 0.00050                       |                  |                  |                  |                  |                  |

| X                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Average Annual Customer Bill Increase, Percent
+ References
No definition available.
+ Details**Name:**pnw_AverageAnnualCustomerBillIncreasePercent**Namespace Prefix:**pnw_**Data Type:**dtr-types:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Base Fuel Rate
+ References
No definition available.
+ Details**Name:**pnw_BaseFuelRate**Namespace Prefix:**pnw_**Data Type:**srt-types:perUnitItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Base Rate Decrease, Elimination of Tax Expense Adjustment Mechanism
+ References
No definition available.
+ Details**Name:**pnw_BaseRateDecreaseEliminationofTaxExpenseAdjustmentMechanism**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Commercial Customers, Market Pricing, Threshold
+ References
No definition available.
+ Details**Name:**pnw_CommercialCustomersMarketPricingThreshold**Namespace Prefix:**pnw_**Data Type:**dtr-types:powerItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Public Utilities, Alternative, Percentage
+ References
No definition available.
+ Details**Name:**pnw_PublicUtilitiesAlternativePercentage**Namespace Prefix:**pnw_**Data Type:**dtr-types:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Public Utilities, Disallowance Of Annual Amortization, Percentage
+ References
No definition available.
+ Details**Name:**pnw_PublicUtilitiesDisallowanceOfAnnualAmortizationPercentage**Namespace Prefix:**pnw_**Data Type:**dtr-types:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Public Utilities, Effective Fair Value Rate, Percentage
+ References
No definition available.
+ Details**Name:**pnw_PublicUtilitiesEffectiveFairValueRatePercentage**Namespace Prefix:**pnw_**Data Type:**dtr-types:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Public Utilities, Increment of Fair Value Rate, Percentage
+ References
No definition available.
+ Details**Name:**pnw_PublicUtilitiesIncrementOfFairValueRatePercentage**Namespace Prefix:**pnw_**Data Type:**dtr-types:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Public Utilities, Maximum Annual Renewable Energy Standard and Tariff
+ References
No definition available.
+ Details**Name:**pnw_PublicUtilitiesMaximumAnnualRenewableEnergyStandardandTariff**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Public Utilities, Minimum Annual Renewable Energy Standard and Tariff
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Public Utilities, Recommended Return on Equity, Percentage
+ References
No definition available.
+ Details**Name:**pnw_PublicUtilitiesRecommendedReturnOnEquityPercentage**Namespace Prefix:**pnw_**Data Type:**dtr-types:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Public Utilities, Reduction Of Equity Rate, Percentage
+ References
No definition available.
+ Details**Name:**pnw_PublicUtilitiesReductionOfEquityRatePercentage**Namespace Prefix:**pnw_**Data Type:**dtr-types:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Public Utilities, Requested Rate Increase (Decrease), Income Tax Amount
+ References
No definition available.
+ Details**Name:**pnw_PublicUtilitiesRequestedRateIncreaseDecreaseIncomeTaxAmount**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Rate Matter, Approximate Percentage of Increase in Average Customer Bill
+ References
No definition available.
+ Details**Name:**pnw_RateMatterApproximatePercentageofIncreaseinAverageCustomerBill**Namespace Prefix:**pnw_**Data Type:**dtr-types:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Rate Matter, Approximate Percentage of Increase in Average Residential Customer Bill
+ References
No definition available.
+ Details**Name:**pnw_RateMatterApproximatePercentageofIncreaseinAverageResidentialCustomerBill**Namespace Prefix:**pnw_**Data Type:**dtr-types:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Rate Matter, Cost Base Rate
+ References
No definition available.
+ Details**Name:**pnw_RateMatterCostBaseRate**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Rate Matter, Environmental Surcharge Cap Rate1
+ References
No definition available.
+ Details**Name:**pnw_RateMatterEnvironmentalSurchargeCapRate1**Namespace Prefix:**pnw_**Data Type:**srt-types:perUnitItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Rate Matter, Funding Limited Income Crisis Bill Program
+ References
No definition available.
+ Details**Name:**pnw_RateMatterFundingLimitedIncomeCrisisBillProgram**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Rate Matter, Resource Comparison Proxy for Exported Energy1
+ References
No definition available.
+ Details**Name:**pnw_RateMatterResourceComparisonProxyforExportedEnergy1**Namespace Prefix:**pnw_**Data Type:**srt-types:perUnitItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Recommended rate adjustment, annualized customer impact, disallowance of investments
+ References
No definition available.
+ Details**Name:**pnw_RecommendedRateAdjustmentAnnualizedCustomerImpactDisallowanceOfInvestments**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Regulatory Impact, Operating Results
+ References
No definition available.
+ Details**Name:**pnw_RegulatoryImpactOperatingResults**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Regulatory Matters, Amount Funded By Customers
+ References
No definition available.
+ Details**Name:**pnw_RegulatoryMattersAmountFundedByCustomers**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Regulatory Matters, Amount Not Recoverable
+ References
No definition available.
+ Details**Name:**pnw_RegulatoryMattersAmountNotRecoverable**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Regulatory Matters, Amounts Funded By Customers, Term
+ References
No definition available.
+ Details**Name:**pnw_RegulatoryMattersAmountsFundedByCustomersTerm**Namespace Prefix:**pnw_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Regulatory Matters, Amounts Funded By Shareholders
+ References
No definition available.
+ Details**Name:**pnw_RegulatoryMattersAmountsFundedByShareholders**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Regulatory Matters, Amounts Funded By Shareholders, Term
+ References
No definition available.
+ Details**Name:**pnw_RegulatoryMattersAmountsFundedByShareholdersTerm**Namespace Prefix:**pnw_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Regulatory Matters, Amounts Recoverable by Rates
+ References
No definition available.
+ Details**Name:**pnw_RegulatoryMattersAmountsRecoverableByRates**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Regulatory Matters, Revenue Increase (Decrease)
+ References
No definition available.
+ Details**Name:**pnw_RegulatoryMattersRevenueIncreaseDecrease**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Settlement Agreement, Base Rate Increase, Changes in Depreciation Schedules
+ References
No definition available.
+ Details**Name:**pnw_SettlementAgreementBaseRateIncreaseChangesinDepreciationSchedules**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of decrease in fuel-related base rates as per the terms of the settlement agreement of a regulatory matter.
+ References
No definition available.
+ Details**Name:**pnw_SettlementAgreementFuelRelatedBaseRateDecrease**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Settlement Agreement, Net Retail Base Rate, Increase
+ References
No definition available.
+ Details**Name:**pnw_SettlementAgreementNetRetailBaseRateIncrease**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Settlement Agreement, Non Fuel and Non Depreciation Base Rate, Increase
+ References
No definition available.
+ Details**Name:**pnw_SettlementAgreementNonFuelandNonDepreciationBaseRateIncrease**Namespace Prefix:**pnw_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of public utility's approved debt to capital, including debt and equity.
+ References
No definition available.
+ Details**Name:**us-gaap_PublicUtilitiesApprovedDebtCapitalStructurePercentage**Namespace Prefix:**us-gaap_**Data Type:**dtr-types:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of public utility's approved equity to capital, including debt and equity.
+ References
No definition available.
+ Details**Name:**us-gaap_PublicUtilitiesApprovedEquityCapitalStructurePercentage**Namespace Prefix:**us-gaap_**Data Type:**dtr-types:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of public utility's approved return on equity.
+ References
No definition available.
+ Details**Name:**us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage**Namespace Prefix:**us-gaap_**Data Type:**dtr-types:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
+ Details**Name:**us-gaap_PublicUtilitiesGeneralDisclosuresLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**dei_LegalEntityAxis=pnw_ArizonaCorporationCommissionMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**dei_LegalEntityAxis=pnw_ResidentialUtilityConsumerOfficeMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RegulatoryAgencyAxis=pnw_ArizonaCorporationCommissionMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**dei_LegalEntityAxis=pnw_ArizonaPublicServiceCompanyMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_RetailRateCaseFilingwithArizonaCorporationCommissionMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilityProgramAxis=pnw_AZSunProgramPhase2Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilityProgramAxis=pnw_CoalCommunityTransitionPlanMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoNationEconomicDevelopmentOrganizationMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoNationElectrificationProjectsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoNationTransmissionRevenueSharingMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoCountyCommunitiesChollaPowerPlantClosureMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoNationGenerationStationMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoNationHopiTribeMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoNationMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoNationHopiReservationMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoNationNavajoPlantMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoCountyCommunitiesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoCountyCommunitiesCCTAndEconomicDevelopmentMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoNationHopiTribeForCCTAndEconomicDevelopmentMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_NavajoNationReservationMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**srt_RangeAxis=srt_MinimumMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**srt_RangeAxis=srt_MaximumMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |