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Retirement Plans and Other Postretirement Benefits - Fair Value of Pinnacle West's Pension Plan (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Pension Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | $ 429,391 | $ 530,171 |
Fair value of plan assets | 2,829,485 | 3,812,041 | $ 3,886,544
Pension Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 893,285 | 1,350,751 |
Pension Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 1,506,809 | 1,931,119 |
Other Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 106,356 | 126,552 |
Fair value of plan assets | 652,287 | 872,435 | $ 961,165
Other Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 371,731 | 491,981 |
Other Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 174,200 | 253,902 |
Cash and cash equivalents | Pension Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 0 | 0 |
Fair value of plan assets | 1,252 | 821 |
Cash and cash equivalents | Pension Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 1,252 | 821 |
Cash and cash equivalents | Pension Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Cash and cash equivalents | Other Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 0 | 0 |
Fair value of plan assets | 204 | 121 |
Cash and cash equivalents | Other Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 204 | 121 |
Cash and cash equivalents | Other Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Corporate | Pension Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 0 | 0 |
Fair value of plan assets | 1,374,810 | 1,765,623 |
Corporate | Pension Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Corporate | Pension Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 1,374,810 | 1,765,623 |
Corporate | Other Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 0 | 0 |
Fair value of plan assets | 166,879 | 244,572 |
Corporate | Other Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Corporate | Other Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 166,879 | 244,572 |
U.S. Treasury | Pension Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 0 | 0 |
Fair value of plan assets | 635,245 | 1,008,211 |
U.S. Treasury | Pension Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 635,245 | 1,008,211 |
U.S. Treasury | Pension Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
U.S. Treasury | Other Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 0 | 0 |
Fair value of plan assets | 221,936 | 287,057 |
U.S. Treasury | Other Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 221,936 | 287,057 |
U.S. Treasury | Other Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Other fixed income | Pension Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 0 | 0 |
Fair value of plan assets | 131,999 | 165,496 |
Other fixed income | Pension Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Other fixed income | Pension Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 131,999 | 165,496 |
Other fixed income | Other Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 0 | 0 |
Fair value of plan assets | 7,321 | 9,330 |
Other fixed income | Other Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Other fixed income | Other Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 7,321 | 9,330 |
Common stock equities | Pension Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 0 | 0 |
Fair value of plan assets | 155,231 | 209,063 |
Common stock equities | Pension Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 155,231 | 209,063 |
Common stock equities | Pension Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Common stock equities | Other Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 0 | 0 |
Fair value of plan assets | 127,493 | 176,024 |
Common stock equities | Other Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 127,493 | 176,024 |
Common stock equities | Other Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Mutual funds | Pension Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 0 | 0 |
Fair value of plan assets | 101,557 | 132,656 |
Mutual funds | Pension Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 101,557 | 132,656 |
Mutual funds | Pension Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Mutual funds | Other Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 0 | 0 |
Fair value of plan assets | 18,824 | 26,262 |
Mutual funds | Other Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 18,824 | 26,262 |
Mutual funds | Other Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Equities | Pension Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 181,912 | 255,141 |
Fair value of plan assets | 181,912 | 255,141 |
Equities | Pension Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Equities | Pension Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Equities | Other Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 73,956 | 96,547 |
Fair value of plan assets | 73,956 | 96,547 |
Equities | Other Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Equities | Other Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Real estate | Pension Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 174,228 | 173,197 |
Fair value of plan assets | 174,228 | 173,197 |
Real estate | Pension Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Real estate | Pension Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Real estate | Other Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 23,541 | 23,851 |
Fair value of plan assets | 23,541 | 23,851 |
Real estate | Other Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Real estate | Other Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Partnerships | Pension Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 13,359 | 15,730 |
Fair value of plan assets | 13,359 | 15,730 |
Partnerships | Pension Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Partnerships | Pension Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Short-term investments and other | Pension Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 59,892 | 86,103 |
Fair value of plan assets | 59,892 | 86,103 |
Short-term investments and other | Pension Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Short-term investments and other | Pension Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 0 | 0 |
Short-term investments and other | Other Benefits |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Other | 8,859 | 6,154 |
Fair value of plan assets | 12,133 | 8,671 |
Short-term investments and other | Other Benefits | Level 1 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | 3,274 | 2,517 |
Short-term investments and other | Other Benefits | Level 2 |  |  |
Fair value of Pinnacle West's pension plan and other postretirement benefit plan assets, by asset category |  |  |
Gross fair value of plan assets | $ 0 | $ 0 |

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