XML 98 R69.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Regulatory Matters - Deferred Fuel and Purchased Power Regulatory Asset (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Change in regulatory asset |  |  |
Deferred fuel and purchased power costs — current period | $ 256,871 | $ 93,651 | $ 82,481
Amounts refunded/(charged) to customers | (44,557) | 12,047 | (49,508)
Arizona Public Service Company |  |  |
Change in regulatory asset |  |  |
Deferred fuel and purchased power costs — current period | 256,871 | 93,651 | 82,481
Amounts refunded/(charged) to customers | (44,557) | 12,047 | (49,508)
ACC | Arizona Public Service Company | Power Supply Adjustor (PSA) |  |  |
Change in regulatory asset |  |  |
Beginning balance | 175,835 | 70,137 |
Deferred fuel and purchased power costs — current period | 256,871 | 93,651 |
Amounts refunded/(charged) to customers | (44,558) | 12,047 |
Ending balance | $ 388,148 | $ 175,835 | $ 70,137

X
- References No definition available. + Details
Name: | pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityRollForward
Namespace Prefix: | pnw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Fuel and Purchased Power Regulatory Asset (Liability), Current + References No definition available. + Details
Name: | pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent
Namespace Prefix: | pnw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amortization of deferred fuel and purchased power costs. + References No definition available. + Details
Name: | pnw_IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization
Namespace Prefix: | pnw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in unrecovered fuel costs for a regulated utility company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInRegulatoryClauseRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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: |

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