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Investments in Nuclear Decommissioning Trusts and Other Special Use Funds - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Arizona Public Service Company |  |
Schedule of Equity Method Investments [Line Items] |  |
Employee medical claims amount | $ 14 | $ 15

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