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Long-Term Debt and Liquidity Matters - Components of Long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Long-Term Debt and Liquidity Matters [Line Items] |  |
Total long-term debt | $ 7,063,735 | $ 6,314,266
TOTAL LONG-TERM DEBT LESS CURRENT MATURITIES | 6,913,735 | 6,314,266
Pinnacle West |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | 7,115,975 |
Unamortized discount | (34) | (44)
Unamortized debt issue costs | (2,924) | (3,635)
Total long-term debt | 797,042 | 496,321
Less current maturities | 150,000 | 0
Total long-term debt less current maturities | 647,042 | 496,321
TOTAL LONG-TERM DEBT LESS CURRENT MATURITIES | 647,139 | 496,321
Arizona Public Service Company |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | 6,315,975 |
Unamortized discount | (14,995) | (15,900)
Unamortized premium | 13,575 | 14,781
Unamortized debt issue costs | (47,862) | (46,911)
Total long-term debt | 6,266,693 | 5,817,945
Less current maturities | 0 | 0
Total long-term debt less current maturities | 6,266,693 | 5,817,945
TOTAL LONG-TERM DEBT LESS CURRENT MATURITIES | 6,266,693 | 5,817,945
Pollution control bonds - Variable | Arizona Public Service Company |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 35,975 | $ 35,975
Weighted-average interest rate (as a percent) | 0.22% | 0.18%
Total pollution control bonds | Arizona Public Service Company |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 35,975 | $ 35,975
Senior unsecured notes | Pinnacle West |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 500,000 | 500,000
Interest rate (as a percent) | 1.30% |
Senior unsecured notes | Arizona Public Service Company |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 6,280,000 | 5,830,000
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 | Maximum |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Interest rate (as a percent) | 6.88% |
Term loan | Pinnacle West |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Term loans | $ 300,000 | $ 0
Term loan | Arizona Public Service Company |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Weighted-average interest rate (as a percent) | 0.81% |

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- Definition Sum of the carrying values as of the balance sheet date of total long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: 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 Reference 3: 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 4: 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 + Details
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