XML 78 R104.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Stock-Based Compensation (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2017 shares | Dec. 31, 2012 shares | Dec. 31, 2019 USD ($) performance_criteria shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 shares
Stock-Based Compensation |  |  |  |  |  |
Compensation cost that has been charged against income | $ |  |  | $ 18 | $ 20 | $ 21 |
Total income tax benefit recognized | $ |  |  | 7 | 7 | 15 |
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted | $ |  |  | $ 9 |  |  |
Expected weighted-average period of recognition of unrecognized compensation cost |  |  | 2 years |  |  |
Total fair value of shares vested | $ |  |  | $ 21 | 24 | 22 |
Performance Shares |  |  |  |  |  |
Number of performance element criteria | performance_criteria |  |  | 2 |  |  |
Performance period |  |  | 3 years |  |  |
Restricted stock unit awards |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Share-based liabilities paid | $ |  |  | $ 5 | 4 | 4 |
Cash flow effect, cash used to settle awards | $ |  |  | $ 5 | $ 5 | $ 4 |
Restricted Stock Units, Stock Grants and Stock Units |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |
Percentage of cash that the participant may elect as a dividend for the first option available under the plan |  |  | 50.00% |  |  |
Percentage of stock that the participant may elect as dividend under second option of plan |  |  | 50.00% |  |  |
Restricted Stock Units, Stock Grants, and Stock Units |  |  |  |  |  |
Restricted Stock Units, Stock Grants and Stock Units |  |  |  |  |  |
Granted (in shares) |  |  | 109,106 |  |  |
Shares released during period (in shares) |  |  | 5,383 |  |  |
Performance Shares |  |  |  |  |  |
Restricted Stock Units, Stock Grants and Stock Units |  |  |  |  |  |
Granted (in shares) |  |  | 142,874 |  |  |
Shares released during period (in shares) |  |  | 9,074 |  |  |
Performance Shares | Maximum |  |  |  |  |  |
Performance Shares |  |  |  |  |  |
Exact number of shares issued as a percentage of the target award |  |  | 200.00% |  |  |
Performance Shares | Minimum |  |  |  |  |  |
Performance Shares |  |  |  |  |  |
Exact number of shares issued as a percentage of the target award |  |  | 0.00% |  |  |
Officers and Key Employees | Restricted stock unit awards |  |  |  |  |  |
Restricted Stock Units, Stock Grants and Stock Units |  |  |  |  |  |
Percentage of fully transferable shares of stock that the participant may elect as a deferral for the first option available under the plan |  |  | 100.00% |  |  |
Percentage of fully transferable shares of stock in that participant may receive cash |  |  | 100.00% |  |  |
Chief Executive Officer | Retention units |  |  |  |  |  |
Restricted Stock Units, Stock Grants and Stock Units |  |  |  |  |  |
Granted (in shares) |  | 50,617 |  |  |  |
Additional shares to be granted as retention award if performance requirements are met (in shares) |  |  |  |  |  | 33,745
Shares released during period (in shares) | 84,362 |  |  |  |  |
Non-Officer Board of Director Member | Restricted stock unit awards |  |  |  |  |  |
Restricted Stock Units, Stock Grants and Stock Units |  |  |  |  |  |
Percentage of fully transferable shares of stock that the participant may elect as a deferral for the first option available under the plan |  |  | 100.00% |  |  |
Percentage of cash that the participant may elect as a dividend for the first option available under the plan |  |  | 100.00% |  |  |
Percentage of stock that the participant may elect as dividend under second option of plan |  |  | 50.00% |  |  |
Percentage of cash that the participant may elect as a dividend equivalent deferral for the first option available under the plan |  |  | 50.00% |  |  |
Percentage of fully transferable shares of stock that the participant may elect as a dividend equivalent deferral for the first option available under the plan |  |  | 50.00% |  |  |
2012 Plan |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Common shares available for grant (in shares) |  |  | 4,600,000 |  |  |
Common shares available for issuance (in shares) |  |  | 1,600,000 |  |  |

X
- Definition Represents the percentage of cash that the participant may elect as a deferred dividend equivalent payment under the first option available under the plan. + References No definition available. + Details
Name: | pnw_PercentageOfCashInWhichElectionToReceiveDividendEquivalentPaymentMayBeMadeByParticipantsForDeferralsOptionOne
Namespace Prefix: | pnw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of fully transferable shares of stock that the participant may elect as a deferred dividend equivalent payment for the first option available under the plan. + References No definition available. + Details
Name: | pnw_PercentageOfFullyTransferableSharesOfStockInWhichElectionToReceiveDividendEquivalentPaymentMayBeMadeByParticipantsForDeferralsOptionOne
Namespace Prefix: | pnw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of fully transferable shares of stock that the participant may elect as a deferred grant for the first option available under the plan. + References No definition available. + Details
Name: | pnw_PercentageOfFullyTransferableSharesOfStockInWhichElectionToReceivePaymentMayBeMadeByParticipantsForDeferralsOptionOne
Namespace Prefix: | pnw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of fully transferable shares of stock that the participant may elect as a deferred grant for the second option available under the plan. + References No definition available. + Details
Name: | pnw_PercentageOfFullyTransferableSharesOfStockInWhichElectionToReceivePaymentMayBeMadeByParticipantsForDeferralsOptionTwo
Namespace Prefix: | pnw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of Cash in which Election to Receive Payment May be Made by Participants for Deferrals Option Two + References No definition available. + Details
Name: | pnw_PercentageofCashinwhichElectiontoReceivePaymentMaybeMadebyParticipantsforDeferralsOptionTwo
Namespace Prefix: | pnw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of additional grants to be made during the period on other than stock (or unit) option plans if performance requirements are met. + References No definition available. + Details
Name: | pnw_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalSharesToBeGrantedIfPerformanceRequirementsAreMet
Namespace Prefix: | pnw_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of performance elements criteria that affect the number of shares received after the end of the specified performance period, if performance criteria conditions are met. + References No definition available. + Details
Name: | pnw_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformanceElementsCriteria
Namespace Prefix: | pnw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of shares issued as a percentage of the target award. + References No definition available. + Details
Name: | pnw_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedAsPercentageOfTargetAward
Namespace Prefix: | pnw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share Based Compensation Arrangement, Percentage of Fully Transferable Shares of Stock in which Election to Receive Payment May be Made by Participants, Option to Receive Cash Payment + References No definition available. + Details
Name: | pnw_ShareBasedCompensationArrangementPercentageofFullyTransferableSharesofStockinwhichElectiontoReceivePaymentMaybeMadebyParticipantsOptiontoReceiveCashPayment
Namespace Prefix: | pnw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units and Stock Granted Additional Disclosures [Abstract] + References No definition available. + Details
Name: | pnw_SharebasedCompensationArrangementbySharebasedPaymentAwardRestrictedStockUnitsandStockGrantedAdditionalDisclosuresAbstract
Namespace Prefix: | pnw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash paid to settle liability for award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=pnw_RestrictedStockUnitsRSUAndStockGrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=pnw_OfficersandKeyEmployeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=pnw_RetentionUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=pnw_NonOfficerBoardofDirectorMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=pnw_A2012PlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |