Income Taxes (Details) - Discontinued Operations, Disposed of by Sale - Bright Canyou Energy Corportion $ in Millions	Jan. 30, 2024 USD ($)
Income Tax Contingency [Line Items]
Investment tax credits	$ 23
Payments to acquire investment tax credits	$ 21

Disposal Group, Including Discontinued Operation, Option To Purchase Investment Tax Credits Generated By Disposed Assets, Amount

No definition available.

Name:	pnw_DisposalGroupIncludingDiscontinuedOperationOptionToPurchaseInvestmentTaxCreditsGeneratedByDisposedAssetsAmount
Namespace Prefix:	pnw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant