| **Schedule I - Condensed Financial Information of Registrant - Cash Flows (Details) - USD ($) $ in Thousands** | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Cash flows from operating activities**                                                                       |            |   |   |
| Net income                                                                                                     | $ 518,781       | $ 500,826 | $ 635,944 |
| **Adjustments to reconcile net income to net cash provided by operating activities:**                          |            |   |   |
| Depreciation and amortization                                                                                  | 854,136         | 817,814 | 719,141 |
| Deferred income taxes                                                                                          | (24,310)        | 43,202 | 117,471 |
| Accounts receivable                                                                                            | (61,983)        | (63,869) | (72,559) |
| Accounts payable                                                                                               | (75,623)        | 90,076 | 20,267 |
| Net cash provided by operating activities                                                                      | 1,207,697       | 1,241,441 | 860,014 |
| **Cash flows from investing activities**                                                                       |            |   |   |
| Proceeds from sale relating to BCE                                                                             | 23,400          | 0 | 0 |
| Net cash used for investing activities                                                                         | (1,694,249)     | (1,618,046) | (1,386,929) |
| **Cash flows from financing activities**                                                                       |            |   |   |
| Issuance of long-term debt                                                                                     | 689,349         | 875,537 | 746,999 |
| Short-term debt repayments under revolving credit facility                                                     | 0               | 0 | (19,000) |
| Short-term borrowings and (repayments) — net                                                             | 241,900         | 48,720 | 142,000 |
| Dividends paid on common stock                                                                                 | (386,486)       | (378,881) | (369,478) |
| Repayment of long-term debt                                                                                    | (32,740)        | (150,000) | 0 |
| Common stock equity issuance and purchases — net                                                         | (4,093)         | (2,653) | (2,350) |
| Net cash provided by financing activities                                                                      | 486,675         | 371,468 | 476,916 |
| NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                                           | 123             | (5,137) | (49,999) |
| CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR                                                                 | 4,832           | 9,969 | 59,968 |
| CASH AND CASH EQUIVALENTS AT END OF YEAR                                                                       | 4,955           | 4,832 | 9,969 |
| Pinnacle West                                                                                                  |            |   |   |
| **Cash flows from operating activities**                                                                       |            |   |   |
| Net income                                                                                                     | 501,557         | 483,602 | 618,720 |
| **Adjustments to reconcile net income to net cash provided by operating activities:**                          |            |   |   |
| Equity in earnings of subsidiaries — net                                                                 | (539,962)       | (500,042) | (628,916) |
| Gain on sale relating to BCE                                                                                   | (6,423)         | 0 | 0 |
| Depreciation and amortization                                                                                  | 76              | 76 | 93 |
| Deferred income taxes                                                                                          | (13,955)        | 17,256 | (11,381) |
| Accounts receivable                                                                                            | (28,273)        | (8,535) | 8,897 |
| Accounts payable                                                                                               | 1,839           | 3,431 | (2,598) |
| Accrued taxes and income tax receivables — net                                                           | 9,505           | (25,157) | 16,079 |
| Dividends received from subsidiaries                                                                           | 393,600         | 385,800 | 376,500 |
| Other                                                                                                          | (14,201)        | 47,719 | 4,214 |
| Net cash provided by operating activities                                                                      | 303,763         | 404,150 | 381,608 |
| **Cash flows from investing activities**                                                                       |            |   |   |
| Proceeds from sale relating to BCE                                                                             | 23,400          | 0 | 0 |
| Investments in subsidiaries                                                                                    | (119,682)       | (186,630) | (145,266) |
| Repayments of loans from subsidiaries and other                                                                | 6,526           | 14,308 | 4,017 |
| Advances of loans to subsidiaries                                                                              | (59,349)        | (3,308) | (12,256) |
| Net cash used for investing activities                                                                         | (149,105)       | (175,630) | (153,505) |
| **Cash flows from financing activities**                                                                       |            |   |   |
| Issuance of long-term debt                                                                                     | 175,000         | 300,000 | 300,000 |
| Short-term debt repayments under revolving credit facility                                                     | 0               | 0 | (19,000) |
| Short-term borrowings and (repayments) — net                                                             | 60,930          | 2,420 | (136,700) |
| Dividends paid on common stock                                                                                 | (386,486)       | (378,881) | (369,478) |
| Repayment of long-term debt                                                                                    | 0               | (150,000) | 0 |
| Common stock equity issuance and purchases — net                                                         | (4,093)         | (2,653) | (2,350) |
| Net cash provided by financing activities                                                                      | (154,649)       | (229,114) | (227,528) |
| NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                                           | 9               | (594) | 575 |
| CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR                                                                 | 0               | 594 | 19 |
| CASH AND CASH EQUIVALENTS AT END OF YEAR                                                                       | $ 9             | $ 0 | $ 594 |

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Represents the cash outflow associated with the advances of loans to subsidiaries.
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Represents the equity in earnings or losses of subsidiaries for the reporting period.
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Represents the cash outflow associated with the contributions paid to the consolidated subsidiaries of the entity.
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Represents dividends received from subsidiaries.
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Proceeds from (Repayments of) Short-term Debt, Net
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Represents the cash inflow associated with the repayments of loans from subsidiaries.
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| - Definition
Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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| - Definition
Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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| - Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
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| - Definition
Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.
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| - Definition
The increase (decrease) during the reporting period of the sum of amounts due within one year (or one business cycle) from customers for the credit sale of goods and services; and from note holders for outstanding loans.
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| - Definition
The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.
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The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.
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| - Definition
Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
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| - Definition
Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
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Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).
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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.
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This element represents the cash inflow during the period from the sale of a component of the entity.
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The cash inflow from the additional capital contribution to the entity.
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| - Definition
The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.
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| - Definition
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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.
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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.
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