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Long-Term Debt and Liquidity Matters - Narrative (Details) |  | 3 Months Ended |
--- | --- | --- | ---
Jul. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) Facility | Dec. 31, 2017 USD ($)
Long-Term Debt and Liquidity Matters |  |  |
Shot-term debt |  | $ 369,900,000 | $ 95,400,000
Debt Provisions |  |  |
Total shareholder equity |  | $ 5,019,757,000 | 5,006,690,000
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 |
Shot-term debt |  | $ 77,000,000 |
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 |
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 |
Pinnacle West | Letter of Credit | Revolving credit facility maturing May 2021 |  |  |
Long-Term Debt and Liquidity Matters |  |  |
Outstanding letters of credit |  | 0 |
Pinnacle West | Commercial paper | Revolving credit facility maturing May 2021 |  |  |
Long-Term Debt and Liquidity Matters |  |  |
Commercial paper |  | 37,400,000 |
APS |  |  |
Long-Term Debt and Liquidity Matters |  |  |
Shot-term debt |  | 255,500,000 | 0
Debt Provisions |  |  |
Total shareholder equity |  | 5,267,598,000 | $ 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 Facilities Maturing in 2021 and 2022 |  |  |
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 | Revolving credit facility maturing May 2021 |  |  |
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 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 | Letter of Credit | Revolving Credit Facilities Maturing in 2021 and 2022 |  |  |
Long-Term Debt and Liquidity Matters |  |  |
Outstanding letters of credit |  | 0 |
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 Facilities Maturing in 2021 and 2022 |  |  |
Long-Term Debt and Liquidity Matters |  |  |
Commercial paper |  | $ 255,500,000 |
LIBOR | Pinnacle West | Revolving Credit Facility | Revolving credit facility maturing July 2018 |  |  |
Long-Term Debt and Liquidity Matters |  |  |
Debt instrument, basis spread on variable rate | 0.80% |  |

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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://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6876686&loc=d3e534808-122878 + Details
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