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Asset Retirement Obligations Narrative (Details) (USD $) | 3 Months Ended |
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Mar. 31, 2015 | Dec. 31, 2014
Asset Retirement Obligations |  |
Asset retirement obligation, current | $ 28,918,000 us-gaap_AssetRetirementObligationCurrent | $ 32,462,000 us-gaap_AssetRetirementObligationCurrent
Arizona Public Service Company |  |
Asset Retirement Obligations |  |
Estimated cash flow revisions | 18,000,000 us-gaap_AssetRetirementObligationRevisionOfEstimate / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember |
Asset retirement obligation, current | 28,918,000 us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 32,462,000 us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Asset retirement obligation | 408,000,000 us-gaap_AssetRetirementObligation / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 391,000,000 us-gaap_AssetRetirementObligation / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Arizona Public Service Company | Four Corners |  |
Asset Retirement Obligations |  |
Estimated cash flow revisions | $ 18,000,000 us-gaap_AssetRetirementObligationRevisionOfEstimate / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pnw_FourCornersMember |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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