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	$ 23.3
Payments to acquire investment tax credits	$ 21.0

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

No definition available.

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