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Long-Term Debt and Liquidity Matters - Estimated Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Estimated fair value of long-term debt, including current maturities |  |
Carrying Amount | $ 4,872,533 | $ 4,871,713
Fair Value | 5,138,726 | 5,304,956
Pinnacle West |  |
Estimated fair value of long-term debt, including current maturities |  |
Carrying Amount | 298,326 | 298,421
Fair Value | 293,061 | 298,608
Arizona Public Service Company |  |
Estimated fair value of long-term debt, including current maturities |  |
Carrying Amount | 4,574,207 | 4,573,292
Fair Value | $ 4,845,665 | $ 5,006,348

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 + Details
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- References No definition available. + 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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- Details
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