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Long-Term Debt and Liquidity Matters - Estimated Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Estimated fair value of long-term debt, including current maturities |  |
Carrying Amount | $ 6,316,420 | $ 5,632,558
Fair Value | 7,393,608 | 6,194,392
Pinnacle West |  |
Estimated fair value of long-term debt, including current maturities |  |
Carrying Amount | 496,117 | 449,425
Fair Value | 507,500 | 450,822
APS |  |
Estimated fair value of long-term debt, including current maturities |  |
Carrying Amount | 5,820,303 | 5,183,133
Fair Value | $ 6,886,108 | $ 5,743,570

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- Definition Amount of short-term and long-term debt and lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 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 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Details
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