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Lines of Credit and Short-Term Borrowings (Details) | Aug. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) Facility | May 13, 2016 USD ($) | May 12, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 02, 2015 USD ($) | Feb. 06, 2013 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Short-term borrowings |  | $ 177,200,000 |  |  |  | $ 0 |  |
Pinnacle West |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Short-term borrowings |  | 41,700,000 |  |  |  | 0 |  |
ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Short-term borrowings |  | 135,500,000 |  |  |  | 0 |  |
ARIZONA PUBLIC SERVICE COMPANY | ACC |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |
Percentage of APS's capitalization used in calculation of short-term debt authorization |  |  |  |  |  |  |  | 7.00%
Required amount to be used in purchases of natural gas and power which is used in calculation of short-term debt authorization |  |  |  |  |  |  |  | $ 500,000,000
Revolving credit facility |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Amount committed |  | 1,275,000,000 |  |  |  | 1,200,000,000 |  |
Long-term line of credit |  | 177,200,000 |  |  |  | 0 |  |
Revolving credit facility | Pinnacle West |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Amount committed |  | 275,000,000 |  |  |  | 200,000,000 |  |
Long-term line of credit |  | 41,700,000 |  |  |  | 0 |  |
Revolving credit facility | Pinnacle West | Revolving credit facility maturing August 2017 |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders | $ 75,000,000 |  |  |  |  |  |  |
Debt instrument, term | 364 days |  |  |  |  |  |  |
Short-term borrowings |  | 40,000,000 |  |  |  |  |  |
Revolving credit facility | Pinnacle West | Revolving credit facility maturing in May 2019 |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Amount committed |  |  |  | $ 200,000,000 |  |  |  |
Revolving credit facility | Pinnacle West | Revolving credit facility maturing May 2021 |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Amount committed |  |  | $ 200,000,000 |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders |  | 300,000,000 |  |  |  |  |  |
Long-term line of credit |  | 0 |  |  |  |  |  |
Revolving credit facility | ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Amount committed |  | 1,000,000,000 |  |  |  | 1,000,000,000 |  |
Long-term line of credit |  | 135,500,000 |  |  |  | 0 |  |
Revolving credit facility | ARIZONA PUBLIC SERVICE COMPANY | Revolving credit facility maturing September 2020 |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Amount committed |  | 500,000,000 |  |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders |  | 700,000,000 |  |  |  |  |  |
Revolving credit facility | ARIZONA PUBLIC SERVICE COMPANY | Revolving credit facility maturing in May 2019 |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Amount committed |  |  |  |  |  |  | $ 500,000,000 |
Revolving credit facility | ARIZONA PUBLIC SERVICE COMPANY | Revolving credit facility maturing May 2021 |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Amount committed |  | 500,000,000 | $ 500,000,000 |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders |  | 700,000,000 |  |  |  |  |  |
Revolving credit facility | ARIZONA PUBLIC SERVICE COMPANY | Revolving credit facilities maturing in 2020 and 2021 |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Amount committed |  | 1,000,000,000 |  |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders |  | 1,400,000,000 |  |  |  |  |  |
Long-term line of credit |  | $ 0 |  |  |  |  |  |
Number of credit facilities | Facility |  | 2 |  |  |  |  |  |
Letter of credit | Pinnacle West | Revolving credit facility maturing May 2021 |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Outstanding letters of credit |  | $ 0 |  |  |  |  |  |
Letter of credit | ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Outstanding letters of credit |  | 35,000,000 |  |  |  |  |  |
Letter of credit | ARIZONA PUBLIC SERVICE COMPANY | Revolving credit facilities maturing in 2020 and 2021 |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Outstanding letters of credit |  | 0 |  |  |  |  |  |
Commercial paper | Pinnacle West | Revolving credit facility maturing May 2021 |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Commercial paper |  | 1,700,000 |  |  |  |  |  |
Commercial paper | ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Maximum commercial paper support available under credit facility |  | 500,000,000 |  |  | $ 500,000,000 | $ 250,000,000 |  |
Commercial paper | ARIZONA PUBLIC SERVICE COMPANY | Revolving credit facilities maturing in 2020 and 2021 |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
Long-term line of credit |  | $ 135,500,000 |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving credit facility | Pinnacle West | Revolving credit facility maturing August 2017 |  |  |  |  |  |  |  |
Lines of Credit and Short-Term Borrowings |  |  |  |  |  |  |  |
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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