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Trust Investments - Schedule of Accounts Receivable And Accounts Payable (Details) - Nuclear Decommissioning Trust (NDT) Fund [Member] - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Schedule of Trust Investments [Line Items]    
Accounts Receivable $ 21 $ 18
Accounts Payable $ 16 $ 5