XML 106 R93.htm IDEA: XBRL DOCUMENT
v3.25.3

Asset Retirement Obligations - Additional information (Details) - APS $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2025 USD ($)
Cholla |
Schedule of Asset Retirement Obligations [Line Items] |
Increase (decrease) in asset retirement obligation | $ 48
Four Corners Coal-Fired Power Plant |
Schedule of Asset Retirement Obligations [Line Items] |
Increase (decrease) in asset retirement obligation | (5)
Navajo Coal-Fired Power Plant |
Schedule of Asset Retirement Obligations [Line Items] |
Increase (decrease) in asset retirement obligation | $ (4)

X
- Definition Schedule of Asset Retirement Obligations [Line Items] + References No definition available. + Details
Name: | pnw_ScheduleOfAssetRetirementObligationsLineItems
Namespace Prefix: | pnw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in asset retirement obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
Name: | us-gaap_AssetRetirementObligationPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=pnw_ChollaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=pnw_ArizonaPublicServiceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=pnw_FourCornersCoalFiredPowerPlantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=pnw_NavajoCoalFiredPowerPlantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |