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Long-Term Debt and Liquidity Matters (Details) - USD ($) | Jan. 15, 2020 | Dec. 31, 2019 | May 09, 2019 | Mar. 01, 2019 | Feb. 26, 2019 | Nov. 20, 2019 | Aug. 19, 2019 | Feb. 28, 2019 | Nov. 27, 2018
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Maximum |  |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |  |
Ratio of consolidated debt to consolidated capitalization (as a percent) |  | 65.00% |  |  |  |  |  |  |
Pinnacle West |  |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |  |
Actual ratio of consolidated debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) |  | 52.00% |  |  |  |  |  |  |
Pinnacle West | Term loan |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity on credit facility |  |  | $ 50,000,000 |  |  |  |  |  |
ARIZONA PUBLIC SERVICE COMPANY | Term loan |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity on credit facility |  |  |  |  | $ 200,000,000 |  |  |  |
ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |  |
Actual ratio of consolidated debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) |  | 47.00% |  |  |  |  |  |  |
ARIZONA PUBLIC SERVICE COMPANY | ACC |  |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |  |
Long term debt authorization |  | $ 5,900,000,000 |  |  |  |  |  |  | $ 5,100,000,000
ARIZONA PUBLIC SERVICE COMPANY | Senior notes |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 500,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  | 8.75% |  |  |  |  |
Senior unsecured notes | Pinnacle West |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 2.25% |  |  |  |  |  |  |
Senior unsecured notes | ARIZONA PUBLIC SERVICE COMPANY | Maximum |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 6.88% |  |  |  |  |  |  |
Senior unsecured notes | ARIZONA PUBLIC SERVICE COMPANY | Minimum |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 2.20% |  |  |  |  |  |  |
Senior unsecured notes | ARIZONA PUBLIC SERVICE COMPANY | Senior notes |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  | $ 100,000,000 |  |  |  |  |  |  |
Notes issued |  |  |  |  |  | $ 300,000,000 | $ 300,000,000 | $ 300,000,000 |
Interest rate (as a percent) |  |  |  |  |  | 3.50% | 2.60% | 4.25% |
Subsequent Event | Senior unsecured notes | ARIZONA PUBLIC SERVICE COMPANY | Senior notes |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt | $ 150,000,000 |  |  |  |  |  |  |  |
Notes issued | $ 250,000,000 |  |  |  |  |  |  |  |
LIBOR | Pinnacle West | Term loan |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 0.55% |  |  |  |  |  |
LIBOR | ARIZONA PUBLIC SERVICE COMPANY | Term loan |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  | 0.50% |  |  |  |

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