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Long-Term Debt and Liquidity Matters - Narrative (Details) | Jun. 27, 2018 | Jun. 26, 2018 USD ($) | May 30, 2018 USD ($) | Jul. 31, 2017 USD ($) | Jul. 12, 2018 USD ($) | Jun. 30, 2018 USD ($) Facility | Jun. 28, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Shot-term debt |  |  |  |  |  | $ 616,249,000 |  | $ 95,400,000
Debt Provisions |  |  |  |  |  |  |  |
Total shareholder equity |  |  |  |  |  | 5,032,019,000 |  | 5,006,690,000
Pinnacle West | Revolving Credit Facility | Revolving credit Facility maturing July 2023 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | 0 |  |
Pinnacle West | Revolving Credit Facility | Revolving credit facility maturing July 2018 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  | $ 125,000,000 |  |  |  |
Debt instrument, term | 364 days |  |  |  |  |  |  |
Pinnacle West | Revolving Credit Facility | Revolving credit facility maturing June 2019 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  |  |  |  | $ 150,000,000 |
Debt instrument, term |  | 364 days |  |  |  |  |  |
Shot-term debt |  |  |  |  |  | 86,000,000 |  |
Pinnacle West | Letter of Credit | Revolving credit Facility maturing July 2023 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  | 0 |  |
Pinnacle West | Commercial paper | Revolving credit Facility maturing July 2023 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  |  | 30,000,000 |  |
APS |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Shot-term debt |  |  |  |  |  | 499,949,000 |  | 0
Extinguishment of debt |  |  | $ 32,000,000 |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |
Total shareholder equity |  |  |  |  |  | 5,285,515,000 |  | $ 5,256,829,000
APS | ACC |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |
Total shareholder equity |  |  |  |  |  | 5,300,000,000 |  |
Total capitalization |  |  |  |  |  | 10,000,000,000 |  |
Dividend restrictions, shareholder equity required |  |  |  |  |  | $ 4,000,000,000 |  |
APS | ACC | Minimum |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |
Required common equity ratio ordered by ACC (as a percent) (at least) |  |  |  |  |  | 40.00% |  |
APS | Revolving Credit Facility | Revolving Credit Facility Maturing May 2021 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  |  | $ 500,000,000 |  |
APS | Revolving Credit Facility | Revolving credit Facility maturing July 2023 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  |  | 500,000,000 |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  |  |  | 700,000,000 |  |
APS | Revolving Credit Facility | Revolving Credit Facility Maturing in 2022 and 2023 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  |  | 1,000,000,000 |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  |  |  | 1,400,000,000 |  |
Long-term line of credit |  |  |  |  |  | $ 0 |  |
Number of line of credit facilities | Facility |  |  |  |  |  | 2 |  |
APS | Revolving Credit Facility | Term Loan Facility |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Extinguishment of debt |  | $ 50,000,000 |  |  |  |  |  |
APS | Revolving Credit Facility | Revolving credit facility maturing June 2022 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  |  | $ 500,000,000 |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  |  |  | 700,000,000 |  |
APS | Commercial paper |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Maximum commercial paper support available under credit facility |  |  |  |  |  | 500,000,000 |  |
APS | Commercial paper | Revolving Credit Facility Maturing in 2022 and 2023 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  |  | $ 500,000,000 |  |
LIBOR | Pinnacle West | Revolving Credit Facility | Revolving credit facility maturing June 2019 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 0.70% |  |  |  |
Subsequent Event | Pinnacle West | Revolving Credit Facility | Revolving Credit Facility Maturing May 2021 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  | $ 200,000,000 |  |  |
Subsequent Event | Pinnacle West | Revolving Credit Facility | Revolving credit Facility maturing July 2023 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  | 200,000,000 |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  |  | 300,000,000 |  |  |
Subsequent Event | APS | Revolving Credit Facility | Revolving credit Facility maturing July 2023 |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  | $ 500,000,000 |  |  |

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