XML 38 R46.htm IDEA: XBRL DOCUMENT
v3.20.1

Regulatory Matters Regulatory Matters - Capital Structure and Costs of Capital (Details) | Oct. 31, 2019
--- | ---
Cost of Capital |
Long-term debt | 4.10%
Common stock equity | 10.15%
Weighted-average cost of capital | 7.41%
Retail Rate Case Filing with Arizona Corporation Commission | APS |
Capital Structure |
Common stock equity | 54.70%
Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS |
Capital Structure |
Long-term debt | 45.30%

X
- Definition Capital Structure [Abstract] + References No definition available. + Details
Name: | pnw_CapitalStructureAbstract
Namespace Prefix: | pnw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost Of Capital [Abstract] + References No definition available. + Details
Name: | pnw_CostOfCapitalAbstract
Namespace Prefix: | pnw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Requested Equity Cost Of Capital, Percentage + References No definition available. + Details
Name: | pnw_PublicUtilitiesRequestedEquityCostOfCapitalPercentage
Namespace Prefix: | pnw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Requested Long-term Debt Cost Of Capital, Percentage + References No definition available. + Details
Name: | pnw_PublicUtilitiesRequestedLongtermDebtCostOfCapitalPercentage
Namespace Prefix: | pnw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Requested Weighted Average Cost Of Capital, Percentage + References No definition available. + Details
Name: | pnw_PublicUtilitiesRequestedWeightedAverageCostOfCapitalPercentage
Namespace Prefix: | pnw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's requested debt to capital, including debt and equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedDebtCapitalStructurePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's requested equity to capital, including debt and equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedEquityCapitalStructurePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_RetailRateCaseFilingwithArizonaCorporationCommissionMember
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_RegulatoryAgencyAxis=pnw_ArizonaCorporationCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |