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Business Segments (Tables)
 9 Months Ended
Sep. 30, 2025
Segment Reporting [Abstract]  
Schedule of Reportable Segment’s Revenues, Significant Expenses, Net Income, and Assets
The following table reconciles our reportable segment’s revenues, significant expenses, and net income (loss) to the Pinnacle West consolidated amounts (dollars in millions):
Three Months Ended September 30,
20252024
Regulated Electricity SegmentOther Pinnacle West ConsolidatedRegulated Electricity SegmentOther Pinnacle West Consolidated
Operating revenues$1,821 $— $1,821 $1,769 $— $1,769 
Fuel and purchased power (656)— (656)(631)— (631)
Operations and maintenance(298)(2)(300)(306)(2)(308)
Depreciation and amortization (225)— (225)(229)— (229)
Taxes other than income taxes (58)— (58)(53)— (53)
Allowance for equity funds used during construction18 — 18 10 — 10 
Pension and other postretirement non-service credits, net3 — 3 12 — 12 
Other income and (expense), net(3)6 3 — 1 1 
Interest charges, net of allowance for borrowed funds used during construction(85)(26)(111)(79)(19)(98)
Income taxes(86)8 (78)(81)7 (74)
Less: Net income attributable to noncontrolling interests(4)— (4)(4)— (4)
Net Income (Loss) $427 $(14)$413 $408 $(13)$395 
Nine Months Ended September 30,
20252024
Regulated Electricity SegmentOtherPinnacle West ConsolidatedRegulated Electricity SegmentOtherPinnacle West Consolidated
Operating revenues$4,212 $— $4,212 $4,030 $— $4,030 
Fuel and purchased power (1,513)— (1,513)(1,426)— (1,426)
Operations and maintenance(879)(7)(886)(832)(6)(838)
Depreciation and amortization (688)— (688)(665)— (665)
Taxes other than income taxes (175)— (175)(171)— (171)
Allowance for equity funds used during construction46 — 46 29 — 29 
Pension and other postretirement non-service credits, net10 (1)9 37 — 37 
Other income and (expense), net(2)26 24 5 22 27 
Interest charges, net of allowance for borrowed funds used during construction(244)(64)(308)(235)(48)(283)
Income taxes(122)15 (107)(124)13 (111)
Less: Net income attributable to noncontrolling interests(13)— (13)(13)— (13)
Net Income (Loss) $632 $(31)$601 $635 $(19)$616 
The following table reconciles our reportable segment’s assets to the Pinnacle West consolidated amount (dollars in millions):
September 30, 2025December 31, 2024
Regulated Electricity SegmentOtherPinnacle West ConsolidatedRegulated Electricity SegmentOtherPinnacle West Consolidated
Total Assets$29,746 $147 $29,893 $25,988 $115 $26,103