Name:	pnw_AllRiskInsuranceForPropertyDamageAndDecontaminationAtPaloVerde
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Represents the annual limit per incident with respect to the maximum assessment per reactor under the program for each nuclear incident, to be periodically adjusted for inflation.

No definition available.

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Represents the annual payment limitation with respect to maximum potential retrospective assessment.

No definition available.

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Asset Purchase Agreement, Option to Purchase, Ownership Interest, Percentage

No definition available.

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Represents the collateral assurance provided that depends upon rating triggers such as a rating downgrade to non-investment grade under NEIL policies.

No definition available.

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Costs related to site-wide groundwater remedial investigation and feasibility study work plan because subsidiary has been found to be potentially responsible parties ("PRPs") with liability for cleanup of hazardous substances that contaminates the soil, water or air, under the Comprehensive Environmental Response, Compensation and Liability Act ("Superfund").

No definition available.

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Costs Related to Oversight and Remedial Investigation Of Superfund Site

No definition available.

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Gain Contingency, New Claims Filed, Number

No definition available.

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Data Type:	xbrli:integerItemType
Balance Type:	na
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Gain Contingency, Number Of Settlement Agreement Time Periods

No definition available.

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Data Type:	xbrli:integerItemType
Balance Type:	na
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Loss Contingency, Number Of Power Plant Operators

No definition available.

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Balance Type:	na
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Maximum Amount that Could be Incurred under Retrospective Assessment of NEIL Policies

No definition available.

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Namespace Prefix:	pnw_
Data Type:	xbrli:monetaryItemType
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Represents the maximum assessment per reactor under the program for each nuclear incident.

No definition available.

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Balance Type:	debit
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Represents the maximum available nuclear liability insurance which is provided by commercial insurance carriers, maintained by Palo Verde as required by the Price Anderson Nuclear Industries Indemnity Act.

No definition available.

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Represents the maximum insurance amount against public liability per occurrence for a nuclear incident.

No definition available.

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Represents the maximum potential retrospective assessment per incident based on the interest of APS in the three Palo Verde units.

No definition available.

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Number of VIE lessor trusts with whom agreements have been made to sell and lease back interests in certain nuclear generating assets and related common facilities.

No definition available.

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Balance Type:	na
Period Type:	instant

Represents the period to provide collateral assurance based on rating triggers such as a rating downgrade to non-investment grade under NEIL policies (in days).

No definition available.

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Balance Type:	na
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Production Tax Credit Guarantees

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the remaining nuclear liability insurance that is provided through mandatory industry wide retrospective assessment program.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Schedule of Commitments and Contingencies [Line Items]

No definition available.

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Balance Type:	na
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Surety Bonds Expiring, Amount

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
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-Name Accounting Standards Codification
-Section 55
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-URI https://asc.fasb.org/1943274/2147477548/944-605-55-15

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Amount awarded from other party in judgment or settlement of litigation.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Amount awarded to other party in judgment or settlement of litigation.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Amount of damages awarded to the plaintiff in the legal matter.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Includes, but is not limited to, lease not yet commenced.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482648/440-10-50-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Includes, but is not limited to, lease not yet commenced.

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Includes, but is not limited to, lease not yet commenced.

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Includes, but is not limited to, lease not yet commenced.

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Includes, but is not limited to, lease not yet commenced.

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Amount of unrecorded obligation to transfer funds in future for fixed or minimum amount or quantity of product and service at fixed or minimum price. Includes, but is not limited to, lease not yet commenced and take-or-pay and throughput contracts.

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Includes, but is not limited to, lease not yet commenced.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482648/440-10-50-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

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Data Type:	na
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Data Type:	na
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Data Type:	na
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