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The actual consolidated debt to total consolidated capitalization ratio, which the entity is required to maintain pursuant to a debt covenant.

No definition available.

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- References

No definition available.

Name:	pnw_DebtProvisionsAbstract
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Data Type:	xbrli:stringItemType
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Represents the cash outflow associated with the contributions paid to the consolidated subsidiaries of the entity.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Represents the long-term debt authorization pursuant to an order from a regulatory authority.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_DebtInstrumentLineItems
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Gross amount of debt extinguished.

No definition available.

Name:	us-gaap_ExtinguishmentOfDebtAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Name:	srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
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Name:	dei_LegalEntityAxis=pnw_ArizonaPublicServiceCompanyMember
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Name:	us-gaap_RegulatoryAgencyAxis=pnw_ArizonaCorporationCommissionMember
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Data Type:	na
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Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
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Data Type:	na
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Name:	us-gaap_DebtInstrumentAxis=pnw_PollutionControlBondsMember
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Data Type:	na
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Name:	us-gaap_DebtInstrumentAxis=pnw_SeniorUnsecuredNotesMaturingNovember2020Member
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Name:	us-gaap_DebtInstrumentAxis=pnw_TermLoanFacilityMember
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