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Trust Investments (Schedule Of Accounts Receivable And Accounts Payable) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Accounts Receivable | $ 1 | $ 1
Accounts Payable | 0 | 0
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Accounts Receivable | 19 | 14
Accounts Payable | $ 6 | $ 6

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