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Trust Investments (Schedule Of Accounts Receivable And Accounts Payable) (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Accounts Receivable | $ 23 | $ 19
Accounts Payable | 17 | 6
Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Accounts Receivable | 1 | 1
Accounts Payable | $ 0 | $ 0

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