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Asset Retirement Obligations Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
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Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
Asset Retirement Obligations |  |  |  |
Asset retirement obligation, current |  |  | $ 26,875 | $ 32,462
Arizona Public Service Company |  |  |  |
Asset Retirement Obligations |  |  |  |
Estimated cash flow revisions |  |  | 24,000 |
Newly incurred liabilities |  |  | 42,000 |
Asset retirement obligation, current |  |  | 26,875 | 32,462
Asset retirement obligation |  |  | $ 449,000 | $ 391,000
Arizona Public Service Company | Four Corners |  |  |  |
Asset Retirement Obligations |  |  |  |
Estimated cash flow revisions | $ 6,000 | $ 18,000 |  |
Arizona Public Service Company | Cholla |  |  |  |
Asset Retirement Obligations |  |  |  |
Newly incurred liabilities | 39,000 |  |  |
Newly incurred liabilities, increase in plant services | 23,000 |  |  |
Newly incurred liabilities, decrease in regulatory liabilities | $ 16,000 |  |  |

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- Definition Asset Retirement Obligation, Liabilities Incurred, Decrease in Regulatory Liability + References No definition available. + Details
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- Definition Asset Retirement Obligation, Liabilities Incurred, Increase in Plant Services + References No definition available. + Details
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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 asset retirement obligations incurred during the period. + 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)(1) -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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