Investments in Nuclear Decommissioning Trusts and Other Special Use Funds - Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
APS
Schedule of Equity Method Investments [Line Items]
Employee medical claims amount	$ 15

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.

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