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Long-Term Debt and Liquidity Matters - Narrative (Details) |  |  |  | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 17, 2020 USD ($) | May 22, 2020 USD ($) | Jan. 15, 2020 USD ($) | Sep. 30, 2020 USD ($) Facility | Sep. 30, 2019 USD ($) | Sep. 11, 2020 USD ($) | Jun. 16, 2020 USD ($) | May 05, 2020 USD ($) | May 04, 2020 USD ($) | Mar. 26, 2020 USD ($) | Nov. 27, 2018 USD ($)
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Percentage of capitalization |  |  |  |  |  |  |  |  |  |  | 7.00%
Capacity available for trade purchases |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Repayment of long-term debt |  |  |  | $ 800,000,000 | $ 500,000,000 |  |  |  |  |  |
Long-term debt limit |  |  |  | 7,500,000,000 |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.30% |  |  |  |  |  | 2.25% |  |  |  |
Senior Unsecured Notes | Senior notes |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 500,000,000 |  |  |  |  |  | $ 300,000,000 |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt | $ 150,000,000 |  |  |  |  |  |  |  |  |  |
Pinnacle West | Revolving Credit Facility | Revolving credit Facility maturing July 2023 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  | 300,000,000 |  |  |  |  |  |  |
Long-term line of credit |  |  |  | 0 |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  | 200,000,000 |  |  |  |  |  |  |
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 |  |  |  | 34,000,000 |  |  |  |  |  |  |
Pinnacle West | Term Loan |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  | $ 24,000,000 |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 31,000,000 | $ 50,000,000 |  |
Variable rate |  |  |  | 1.40% |  |  |  |  |  |  |
APS |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  | $ 350,000,000 | $ 500,000,000 |  |  |  |  |  |
Long-term debt limit |  |  |  |  |  |  |  |  |  | $ 5,900,000,000 |
APS | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  | 3.35% |  |  |  | 2.65% |  |  |  |  |
APS | Senior Unsecured Notes | Senior notes |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 600,000,000 | $ 250,000,000 |  |  | $ 400,000,000 |  |  |  |  |
Extinguishment of debt |  |  | $ 150,000,000 |  |  |  |  |  |  |  |
APS | Revolving Credit Facility | Revolving credit Facility maturing July 2023 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  | 700,000,000 |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  | 500,000,000 |  |  |  |  |  |  |
APS | Revolving Credit Facility | Revolving Credit Facility Maturing in 2022 and 2023 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |
Number of line of credit facilities | Facility |  |  |  | 2 |  |  |  |  |  |  |
APS | Revolving Credit Facility | Revolving credit facility maturing June 2022 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  | $ 700,000,000 |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  | 500,000,000 |  |  |  |  |  |  |
APS | Commercial paper |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Maximum commercial paper support available under credit facility |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
APS | Term Loan |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  | $ 200,000,000 |  |  |  |  |  |  |  |  |
Minimum | APS | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 2.20% |  |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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